<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Util_Ui.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;

use DOMDocument;

class Util_Ui {
	/**
	 * Returns button html
	 *
	 * @param string $text
	 * @param string $onclick
	 * @param string $class
	 * @return string
	 */
	public static function button( $text, $onclick = '', $class = 'button',
		$name = '' ) {
		$maybe_name = ( empty( $name ) ? '' : ' name=&quot;' . esc_attr( $name ) . '&quot;' );
		return '&lt;input type=&quot;button&quot;' . $maybe_name . ' class=&quot;' .
			esc_attr( $class ) . '&quot; value=&quot;' . esc_attr( $text ) .
			'&quot; onclick=&quot;' . esc_attr( $onclick ) . '&quot; /&gt;';
	}

	/**
	 * Returns button link html.
	 *
	 * @param string $text       Text.
	 * @param string $url        URL.
	 * @param bool   $new_window Open link in a new window.
	 * @param string $class      Class.
	 * @param string $name       Name.
	 * @return string
	 */
	public static function button_link( $text, $url, $new_window = false, $class = 'button', $name = '' ) {
		$url = str_replace( '&amp;amp;', '&amp;', $url );

		if ( $new_window ) {
			$onclick = sprintf( 'window.open(\'%s\');', addslashes( $url ) );
		} else {
			$onclick = '';

			if ( strpos( $class, 'w3tc-button-ignore-change' ) &gt;= 0 ) {
				$onclick .= 'w3tc_beforeupload_unbind(); ';
			}

			$onclick .= sprintf( 'document.location.href=\'%s\';', addslashes( $url ) );
		}

		return self::button( $text, $onclick, $class, $name );
	}

	public static function url( $addon ) {
		if ( ! isset( $addon['page'] ) ) {
			$addon['page'] = Util_Request::get_string( 'page', 'w3tc_dashboard' );
		}

		$url = 'admin.php';
		$amp = '?';
		foreach ( $addon as $key =&gt; $value ) {
			$url .= $amp . rawurlencode( $key ) . '=' . rawurlencode( $value );
			$amp = '&amp;';
		}

		$url = wp_nonce_url( $url, 'w3tc' );

		return $url;
	}

	/**
	 * Returns hide note button html
	 *
	 * @param string  $text
	 * @param string  $note
	 * @param string  $redirect
	 * @param boolean $admin         if to use config admin.
	 * @param string  $page
	 * @param string  $custom_method
	 * @return string
	 */
	public static function button_hide_note( $text, $note, $redirect = '',
		$admin = false, $page = '',
		$custom_method = 'w3tc_default_hide_note' ) {
		if ( '' === $page ) {
			$page = Util_Request::get_string( 'page', 'w3tc_dashboard' );
		}

		$url = sprintf( 'admin.php?page=%s&amp;%s&amp;note=%s', $page, $custom_method, $note );

		if ( $admin ) {
			$url .= '&amp;admin=1';
		}

		if ( '' !== $redirect ) {
			$url .= '&amp;redirect=' . rawurlencode( $redirect );
		}

		$url = wp_nonce_url( $url, 'w3tc' );

		return self::button_link( $text, $url, false, 'button', 'w3tc_hide_' . $custom_method );
	}

	public static function button_hide_note2( $parameters ) {
		return self::button_link(
			__( 'Hide this message', 'w3-total-cache' ),
			self::url( $parameters ),
			false,
			'button',
			'w3tc_hide_' . self::config_key_to_http_name( $parameters['key'] )
		);
	}

	public static function action_button( $action, $url, $class = '',
		$new_window = false ) {
		return self::button_link( $action, $url, $new_window, $class );
	}
	/**
	 * Returns popup button html
	 *
	 * @param string  $text
	 * @param string  $action
	 * @param string  $params
	 * @param integer $width
	 * @param integer $height
	 * @return string
	 */
	public static function button_popup( $text, $action, $params = '', $width = 800, $height = 600 ) {
		$url = wp_nonce_url( sprintf( 'admin.php?page=w3tc_dashboard&amp;w3tc_%s%s', $action, ( '' !== $params ? '&amp;' . $params : '' ) ), 'w3tc' );
		$url = str_replace( '&amp;amp;', '&amp;', $url );

		$onclick = sprintf( 'window.open(\'%s\', \'%s\', \'width=%d,height=%d,status=no,toolbar=no,menubar=no,scrollbars=yes\');', $url, $action, $width, $height );

		return self::button( $text, $onclick );
	}

	/**
	 * Returns label string for a config key.
	 *
	 * @param string $config_key
	 * @param string $area
	 */
	public static function config_label( $config_key ) {
		static $config_labels = null;
		if ( is_null( $config_labels ) ) {
			$config_labels = apply_filters( 'w3tc_config_labels', array() );
		}

		if ( isset( $config_labels[ $config_key ] ) ) {
			return $config_labels[ $config_key ];
		}

		return '';
	}

	/**
	 * Prints the label string for a config key.
	 *
	 * @param string $config_key
	 * @param string $area
	 */
	public static function e_config_label( $config_key ) {
		$config_label = self::config_label( $config_key );
		echo wp_kses(
			$config_label,
			self::get_allowed_html_for_wp_kses_from_content( $config_label )
		);
	}

	/**
	 * Returns postbox header
	 *
	 * WordPress 5.5 introduced .postbox-header, which broke the styles of our postboxes. This was
	 * resolved by adding additional css to /pub/css/options.css and pub/css/widget.css tagged with
	 * a &quot;WP 5.5&quot; comment.
	 *
	 * @todo Add .postbox-header to our postboxes and cleanup css.
	 * @link https://github.com/BoldGrid/w3-total-cache/issues/237
	 *
	 * @param string $title
	 * @param string $class
	 * @param string $id
	 * @return void
	 */
	public static function postbox_header( $title, $class = '', $id = '' ) {
		if ( ! empty( $id ) ) {
			$id = ' id=&quot;' . esc_attr( $id ) . '&quot;';
		}
		echo '&lt;div' . $id . ' class=&quot;postbox ' . esc_attr( $class ) . '&quot;&gt;
		&lt;div class=&quot;handlediv&quot; title=&quot;' . esc_attr__( 'Click to toggle', 'w3-total-cache' ) . '&quot;&gt;&lt;br /&gt;&lt;/div&gt;
		&lt;h3 class=&quot;hndle&quot;&gt;&lt;span&gt;' . wp_kses( $title, self::get_allowed_html_for_wp_kses_from_content( $title ) ) . '&lt;/span&gt;&lt;/h3&gt;
		&lt;div class=&quot;inside&quot;&gt;';
	}

	/**
	 * Returns postbox footer
	 *
	 * @return void
	 */
	public static function postbox_footer() {
		echo '&lt;/div&gt;&lt;/div&gt;';
	}

	public static function button_config_save( $id = '', $extra = '' ) {
		$b1_id = 'w3tc_save_options_' . $id;
		$b2_id = 'w3tc_default_save_and_flush_' . $id;

		?&gt;
		&lt;p class=&quot;submit&quot;&gt;
			&lt;?php
			$nonce_field = self::nonce_field( 'w3tc' );
			echo wp_kses(
				$nonce_field,
				self::get_allowed_html_for_wp_kses_from_content( $nonce_field )
			);
			?&gt;
			&lt;input type=&quot;submit&quot; id=&quot;&lt;?php echo esc_attr( $b1_id ); ?&gt;&quot;
				name=&quot;w3tc_save_options&quot;
				class=&quot;w3tc-button-save button-primary&quot;
				value=&quot;&lt;?php esc_attr_e( 'Save all settings', 'w3-total-cache' ); ?&gt;&quot; /&gt;
			&lt;?php
			echo wp_kses(
				$extra,
				self::get_allowed_html_for_wp_kses_from_content( $extra )
			);
			?&gt;
			&lt;?php if ( ! is_network_admin() ) : ?&gt;
			&lt;input type=&quot;submit&quot; id=&quot;&lt;?php echo esc_attr( $b2_id ); ?&gt;&quot;
				name=&quot;w3tc_default_save_and_flush&quot; style=&quot;float: right&quot;
				class=&quot;w3tc-button-save button-primary&quot;
				value=&quot;&lt;?php esc_attr_e( 'Save Settings &amp; Purge Caches', 'w3-total-cache' ); ?&gt;&quot; /&gt;
			&lt;?php endif ?&gt;
		&lt;/p&gt;
		&lt;?php
	}

	public static function sealing_disabled( $key ) {
		$c = Dispatcher::config();
		if ( $c-&gt;is_sealed( $key ) ) {
			echo 'disabled=&quot;disabled&quot; ';
		}
	}

	/**
	 * Returns nonce field HTML
	 *
	 * @param string $action
	 * @param string $name
	 * @param bool   $referer
	 * @internal param bool $echo
	 * @return string
	 */
	public static function nonce_field( $action = -1, $name = '_wpnonce', $referer = true ) {
		$return = '&lt;input type=&quot;hidden&quot; name=&quot;' . esc_attr( $name ) . '&quot; value=&quot;' . esc_attr( wp_create_nonce( $action ) ) . '&quot; /&gt;';

		if ( $referer ) {
			$return .= wp_referer_field( false );
		}

		return $return;
	}

	/**
	 * Returns an notification box
	 *
	 * @param string $message
	 * @param string $id      adds an id to the notification box.
	 * @return string
	 */
	public static function get_notification_box( $message, $id = '' ) {
		$page_val = Util_Request::get_string( 'page' );

		if ( empty( $page_val ) || ( ! empty( $page_val ) &amp;&amp; 'w3tc_' !== substr( $page_val, 0, 5 ) ) ) {
			$logo = sprintf(
				'&lt;img src=&quot;%s&quot; alt=&quot;W3 Total Cache&quot; style=&quot;height:30px&quot; /&gt;&quot;',
				esc_url( plugins_url( '/pub/img/W3TC_dashboard_logo_title.png', W3TC_FILE ) ) . ''
			);
		} else {
			$logo = '';
		}
		return sprintf(
			'&lt;div %s class=&quot;updated&quot;&gt;%s&lt;/div&gt;',
			$id ? 'id=&quot;' . esc_attr( $id ) . '&quot;' : '',
			$logo . wp_kses( $message, self::get_allowed_html_for_wp_kses_from_content( $message ) )
		);
	}

	/**
	 * Echos an notification box
	 *
	 * @param string $message
	 * @param string $id      adds an id to the notification box.
	 */
	public static function e_notification_box( $message, $id = '' ) {
		$notification_box = self::get_notification_box( $message, $id );
		echo wp_kses(
			$notification_box,
			self::get_allowed_html_for_wp_kses_from_content( $notification_box )
		);
	}

	/**
	 * Echos an error box.
	 *
	 * @param string $message Message.
	 * @param string $id      Id.
	 */
	public static function error_box( $message, $id = '' ) {
		$page_val = Util_Request::get_string( 'page' );

		if ( empty( $page_val ) || ( ! empty( $page_val ) &amp;&amp; 'w3tc_' !== substr( $page_val, 0, 5 ) ) ) {
			$logo = sprintf(
				'&lt;img src=&quot;%s&quot; alt=&quot;W3 Total Cache&quot; style=&quot;height:30px&quot; /&gt;',
				esc_url( plugins_url( '/pub/img/W3TC_dashboard_logo_title.png', W3TC_FILE ) . '' )
			);
		} else {
			$logo = '';
		}

		$v = sprintf(
			'&lt;div %s class=&quot;error&quot;&gt;%s&lt;/div&gt;',
			$id ? 'id=&quot;' . esc_attr( $id ) . '&quot;' : '',
			$logo . wp_kses( $message, self::get_allowed_html_for_wp_kses_from_content( $message ) )
		);

		echo wp_kses(
			$v,
			self::get_allowed_html_for_wp_kses_from_content( $v )
		);
	}

	/**
	 * Format bytes into B, KB, MB, GB and TB
	 *
	 * @param unknown $bytes
	 * @param int     $precision
	 * @return string
	 */
	public static function format_bytes( $bytes, $precision = 2 ) {
		$units = array( 'B', 'KB', 'MB', 'GB', 'TB' );

		$bytes = max( $bytes, 0 );
		$pow   = floor( ( $bytes ? log( $bytes ) : 0 ) / log( 1024 ) );
		$pow   = min( $pow, count( $units ) - 1 );

		// Uncomment one of the following alternatives.
		$bytes /= pow( 1024, $pow );
		// $bytes /= ( 1 &lt;&lt; ( 10 * $pow ) );

		return round( $bytes, $precision ) . ' ' . $units[ $pow ];
	}

	public static function format_mbytes( $bytes, $precision = 2 ) {
		$units = array( 'B', 'KB', 'MB', 'GB', 'TB' );

		$bytes = max( $bytes, 0 );
		$pow   = floor( ( $bytes ? log( $bytes ) : 0 ) / log( 1024 ) );
		$pow   = min( $pow, count( $units ) - 1 );

		// Uncomment one of the following alternatives.
		$bytes /= pow( 1024, $pow );
		// $bytes /= ( 1 &lt;&lt; ( 10 * $pow ) );

		return round( $bytes, $precision ) . ' ' . $units[ $pow + 2 ];
	}

	/**
	 * Returns an input text element
	 *
	 * @param string $id
	 * @param string $name
	 * @param string $value
	 * @param bool   $disabled
	 * @param int    $size
	 */
	public static function r_hidden( $id, $name, $value ) {
		return '&lt;input type=&quot;hidden&quot; id=&quot;' . esc_attr( $id ) .
			'&quot; name=&quot;' . esc_attr( $name ) .
			'&quot; value=&quot;' . esc_attr( $value ) . '&quot; /&gt;';
	}

	/**
	 * Echos an input text element
	 *
	 * @param string $id
	 * @param string $name
	 * @param string $value
	 * @param bool   $disabled
	 * @param int    $size
	 */
	public static function hidden( $id, $name, $value ) {
		$hidden = self::r_hidden( $id, $name, $value );
		echo wp_kses(
			$hidden,
			self::get_allowed_html_for_wp_kses_from_content( $hidden )
		);
	}

	/**
	 * Echos an label element
	 *
	 * @param string $id
	 * @param string $text
	 */
	public static function label( $id, $text ) {
		$label = '&lt;label for=&quot;' . esc_attr( $id ) . '&quot;&gt;' . $text . '&lt;/label&gt;';
		echo wp_kses(
			$label,
			self::get_allowed_html_for_wp_kses_from_content( $label )
		);
	}

	/**
	 * Echos an input text element
	 *
	 * @param string $id
	 * @param string $name
	 * @param string $value
	 * @param bool   $disabled
	 * @param int    $size
	 */
	public static function textbox( $id, $name, $value, $disabled = false,
			$size = 40, $type = 'text', $placeholder = '' ) {
		echo '&lt;input class=&quot;enabled&quot; type=&quot;' . esc_attr( $type ) . '&quot;
			 id=&quot;' . esc_attr( $id ) . '&quot;
			 name=&quot;' . esc_attr( $name ) . '&quot;
			 value=&quot;' . esc_attr( $value ) . '&quot; ';
		disabled( $disabled );
		echo ' size=&quot;' . esc_attr( $size ) . '&quot;';

		if ( ! empty( $placeholder ) ) {
			echo ' placeholder=&quot;' . esc_attr( $placeholder ) . '&quot;';
		}

		echo ' /&gt;';
	}

	/**
	 * Echos an input password element
	 *
	 * @param string $id
	 * @param string $name
	 * @param string $value
	 * @param bool   $disabled
	 * @param int    $size
	 */
	public static function passwordbox( $id, $name, $value, $disabled = false, $size = 40 ) {
		echo '&lt;input class=&quot;enabled&quot; type=&quot;password&quot;
			 id=&quot;' . esc_attr( $id ) . '&quot;
			 name=&quot;' . esc_attr( $name ) . '&quot;
			 value=&quot;' . esc_attr( $value ) . '&quot; ';
		disabled( $disabled );
		echo ' size=&quot;' . esc_attr( $size ) . '&quot; /&gt;';
	}

	/**
	 * Echos an select element
	 *
	 * @param string $id
	 * @param string $name
	 * @param bool   $state     whether checked or not.
	 * @param bool   $disabled
	 * @param array  $optgroups
	 */
	public static function selectbox( $id, $name, $value, $values,
			$disabled = false, $optgroups = null ) {
		echo '&lt;select id=&quot;' . esc_attr( $id ) . '&quot; name=&quot;' . esc_attr( $name ) . '&quot; ';
		disabled( $disabled );
		echo &quot;&gt;\n&quot;;

		if ( ! is_array( $optgroups ) ) {
			// simle control.
			foreach ( $values as $key =&gt; $descriptor ) {
				self::option( $key, $value, $descriptor );
			}
		} else {
			// with optgroups.
			$current_optgroup = -1;
			foreach ( $values as $key =&gt; $descriptor ) {
				$optgroup = ( isset( $descriptor['optgroup'] ) ? $descriptor['optgroup'] : -1 );
				if ( $optgroup !== $current_optgroup ) {
					if ( -1 !== $current_optgroup ) {
						echo '&lt;/optgroup&gt;';
					}
					echo '&lt;optgroup label=&quot;' . esc_attr( $optgroups[ $optgroup ] ) . '&quot;&gt;' . &quot;\n&quot;;
					$current_optgroup = $optgroup;
				}

				self::option( $key, $value, $descriptor );
			}

			if ( -1 !== $current_optgroup ) {
				echo '&lt;/optgroup&gt;';
			}
		}

		echo '&lt;/select&gt;';
	}

	private static function option( $key, $selected_value, $descriptor ) {
		if ( ! is_array( $descriptor ) ) {
			$label    = $descriptor;
			$disabled = false;
		} else {
			$label    = $descriptor['label'];
			$disabled = ! empty( $descriptor['disabled'] );
		}

		echo '&lt;option value=&quot;' . esc_attr( $key ) . '&quot; ';
		selected( $selected_value, $key );
		disabled( $disabled );
		echo '&gt;' . wp_kses( $label, self::get_allowed_html_for_wp_kses_from_content( $label ) ) . '&lt;/option&gt;' . &quot;\n&quot;;
	}

	/**
	 * Echos a group of radio elements
	 * values: value =&gt; label pair or
	 * value =&gt; array(label, disabled, postfix).
	 */
	public static function radiogroup( $name, $value, $values,
			$disabled = false, $separator = '' ) {
		$first = true;
		foreach ( $values as $key =&gt; $label_or_array ) {
			if ( $first ) {
				$first = false;
			} else {
				echo wp_kses(
					$separator,
					self::get_allowed_html_for_wp_kses_from_content( $separator )
				);
			}

			$label         = '';
			$item_disabled = false;
			$postfix       = '';
			$pro_feature   = false;

			if ( ! is_array( $label_or_array ) ) {
				$label = $label_or_array;
			} else {
				$label         = $label_or_array['label'];
				$item_disabled = $label_or_array['disabled'];
				$postfix       = isset( $label_or_array['postfix'] ) ? $label_or_array['postfix'] : '';
				$pro_feature   = isset( $label_or_array['pro_feature'] ) ? $label_or_array['pro_feature'] : false;
			}

			if ( $pro_feature ) {
				self::pro_wrap_maybe_start();
			}
			echo '&lt;label&gt;&lt;input type=&quot;radio&quot;
				 id=&quot;' . esc_attr( $name . '__' . $key ) . '&quot;
				 name=&quot;' . esc_attr( $name ) . '&quot;
				 value=&quot;' . esc_attr( $key ) . '&quot;';
			checked( $value, $key );
			disabled( $disabled || $item_disabled );
			echo ' /&gt;' . wp_kses( $label, self::get_allowed_html_for_wp_kses_from_content( $label ) ) . '&lt;/label&gt;' . wp_kses( $postfix, self::get_allowed_html_for_wp_kses_from_content( $postfix ) ) . &quot;\n&quot;;
			if ( $pro_feature ) {
				self::pro_wrap_description(
					$label_or_array['pro_excerpt'],
					$label_or_array['pro_description'],
					$name . '__' . $key
				);

				self::pro_wrap_maybe_end( $name . '__' . $key );
			}
		}
	}

	/**
	 * Echos an input text element
	 *
	 * @param string $id
	 * @param string $name
	 * @param string $value
	 * @param bool   $disabled
	 */
	public static function textarea( $id, $name, $value, $disabled = false ) {
		?&gt;
		&lt;textarea class=&quot;enabled&quot; id=&quot;&lt;?php echo esc_attr( $id ); ?&gt;&quot;
			name=&quot;&lt;?php echo esc_attr( $name ); ?&gt;&quot; rows=&quot;5&quot; cols=25 style=&quot;width: 100%&quot;
			&lt;?php disabled( $disabled ); ?&gt;&gt;&lt;?php echo esc_textarea( $value ); ?&gt;&lt;/textarea&gt;
		&lt;?php
	}

	/**
	 * Echos an input checkbox element
	 *
	 * @param string $id
	 * @param string $name
	 * @param bool   $state    whether checked or not.
	 * @param bool   $disabled
	 */
	public static function checkbox( $id, $name, $state, $disabled = false, $label = null ) {
		if ( ! is_null( $label ) ) {
			echo '&lt;label&gt;';
		}

		echo '&lt;input type=&quot;hidden&quot; name=&quot;' . esc_attr( $name ) . '&quot;
			 value=&quot;' . esc_attr( ( ! $disabled ? '0' : ( $state ? '1' : '0' ) ) ) . '&quot;&gt;' . &quot;\n&quot;;
		echo '&lt;input class=&quot;enabled&quot; type=&quot;checkbox&quot; id=&quot;' . esc_attr( $id ) . '&quot;
			 name=&quot;' . esc_attr( $name ) . '&quot; value=&quot;1&quot; ';
		checked( $state );
		disabled( $disabled );
		echo ' /&gt; ';

		if ( ! is_null( $label ) ) {
			echo wp_kses( $label, self::get_allowed_html_for_wp_kses_from_content( $label ) ) . '&lt;/label&gt;';
		}
	}

	/**
	 * Echos an element
	 *
	 * @param string $type
	 * @param string $id
	 * @param string $name
	 * @param mixed  $value
	 * @param bool   $disabled
	 */
	public static function element( $type, $id, $name, $value, $disabled = false ) {
		switch ( $type ) {
			case 'textbox':
				self::textbox( $id, $name, $value, $disabled );
				break;
			case 'password':
				self::passwordbox( $id, $name, $value, $disabled );
				break;
			case 'textarea':
				self::textarea( $id, $name, $value, $disabled );
				break;
			case 'checkbox':
			default:
				self::checkbox( $id, $name, $value, $disabled );
				break;
		}
	}

	public static function checkbox2( $e ) {
		self::checkbox(
			$e['name'],
			$e['name'],
			$e['value'],
			( isset( $e['disabled'] ) ? $e['disabled'] : false ),
			( isset( $e['label'] ) ? $e['label'] : null )
		);
	}

	public static function radiogroup2( $e ) {
		self::radiogroup(
			$e['name'],
			$e['value'],
			$e['values'],
			$e['disabled'],
			$e['separator']
		);
	}

	public static function selectbox2( $e ) {
		self::selectbox(
			$e['name'],
			$e['name'],
			$e['value'],
			$e['values'],
			( isset( $e['disabled'] ) ? $e['disabled'] : false ),
			( isset( $e['optgroups'] ) ? $e['optgroups'] : null )
		);
	}

	public static function textbox2( $e ) {
		self::textbox(
			$e['name'],
			$e['name'],
			$e['value'],
			( isset( $e['disabled'] ) ? $e['disabled'] : false ),
			( ! empty( $e['size'] ) ? $e['size'] : 20 ),
			( ! empty( $e['type'] ) ? $e['type'] : 'text' ),
			( ! empty( $e['placeholder'] ) ? $e['placeholder'] : '' )
		);
	}

	public static function textarea2( $e ) {
		self::textarea(
			$e['name'],
			$e['name'],
			$e['value'],
			( isset( $e['disabled'] ) ? $e['disabled'] : false )
		);
	}

	public static function control2( $a ) {
		if ( 'checkbox' === $a['control'] ) {
			self::checkbox2(
				array(
					'name'     =&gt; $a['control_name'],
					'value'    =&gt; $a['value'],
					'disabled' =&gt; $a['disabled'],
					'label'    =&gt; $a['checkbox_label'],
				)
			);
		} elseif ( 'radiogroup' === $a['control'] ) {
			self::radiogroup2(
				array(
					'name'      =&gt; $a['control_name'],
					'value'     =&gt; $a['value'],
					'disabled'  =&gt; $a['disabled'],
					'values'    =&gt; $a['radiogroup_values'],
					'separator' =&gt; isset( $a['radiogroup_separator'] ) ? $a['radiogroup_separator'] : '',
				)
			);
		} elseif ( 'selectbox' === $a['control'] ) {
			self::selectbox2(
				array(
					'name'      =&gt; $a['control_name'],
					'value'     =&gt; $a['value'],
					'disabled'  =&gt; $a['disabled'],
					'values'    =&gt; $a['selectbox_values'],
					'optgroups' =&gt; isset( $a['selectbox_optgroups'] ) ? $a['selectbox_optgroups'] : null,
				)
			);
		} elseif ( 'textbox' === $a['control'] ) {
			self::textbox2(
				array(
					'name'        =&gt; $a['control_name'],
					'value'       =&gt; $a['value'],
					'disabled'    =&gt; $a['disabled'],
					'type'        =&gt; isset( $a['textbox_type'] ) ? $a['textbox_type'] : null,
					'size'        =&gt; isset( $a['textbox_size'] ) ? $a['textbox_size'] : null,
					'placeholder' =&gt; isset( $a['textbox_placeholder'] ) ? $a['textbox_placeholder'] : null,
				)
			);
		} elseif ( 'textarea' === $a['control'] ) {
			self::textarea2(
				array(
					'name'     =&gt; $a['control_name'],
					'value'    =&gt; $a['value'],
					'disabled' =&gt; $a['disabled'],
				)
			);
		} elseif ( 'none' === $a['control'] ) {
			echo wp_kses( $a['none_label'], self::get_allowed_html_for_wp_kses_from_content( $a['none_label'] ) );
		} elseif ( 'button' === $a['control'] ) {
			echo '&lt;button type=&quot;button&quot; class=&quot;button&quot;&gt;' . wp_kses( $a['none_label'], self::get_allowed_html_for_wp_kses_from_content( $a['none_label'] ) ) . '&lt;/button&gt;';
		}
	}

	/**
	 * Get table classes for tables including pro features.
	 *
	 * When on the free version, tables with pro features have additional classes added to help highlight
	 * the premium feature. If the user is on pro, this class is omitted.
	 *
	 * @since 0.14.3
	 *
	 * @return string
	 */
	public static function table_class() {
		$table_class[] = 'form-table';

		if ( ! Util_Environment::is_w3tc_pro( Dispatcher::config() ) ) {
			$table_class[] = 'w3tc-pro-feature';
		}

		return implode( ' ', $table_class );
	}

	/**
	 * Renders &lt;tr&gt; element with controls
	 * id =&gt;
	 * label =&gt;
	 * label_class =&gt;
	 * &lt;control&gt; =&gt; details
	 * style - default is label,controls view,
	 *         alternative is one-column view
	 */
	public static function table_tr( $a ) {
		$id = isset( $a['id'] ) ? $a['id'] : '';
		$a  = apply_filters( 'w3tc_ui_settings_item', $a );

		echo '&lt;tr&gt;&lt;th';

		if ( isset( $a['label_class'] ) ) {
			echo ' class=&quot;' . esc_attr( $a['label_class'] ) . '&quot;';
		}
		echo '&gt;';
		if ( isset( $a['label'] ) ) {
			self::label( $id, $a['label'] );
		}

		echo &quot;&lt;/th&gt;\n&lt;td&gt;\n&quot;;

		foreach ( $a as $key =&gt; $e ) {
			if ( 'checkbox' === $key ) {
				self::checkbox(
					$id,
					isset( $e['name'] ) ? $e['name'] : null,
					$e['value'],
					( isset( $e['disabled'] ) ? $e['disabled'] : false ),
					( isset( $e['label'] ) ? $e['label'] : null )
				);
			} elseif ( 'description' === $key ) {
				echo '&lt;p class=&quot;description&quot;&gt;' . wp_kses( $e, self::get_allowed_html_for_wp_kses_from_content( $e ) ) . '&lt;/p&gt;';
			} elseif ( 'hidden' === $key ) {
				self::hidden( '', $e['name'], $e['value'] );
			} elseif ( 'html' === $key ) {
				echo wp_kses( $e, self::get_allowed_html_for_wp_kses_from_content( $e ) );
			} elseif ( 'radiogroup' === $key ) {
				self::radiogroup(
					$e['name'],
					$e['value'],
					$e['values'],
					$e['disabled'],
					$e['separator']
				);
			} elseif ( 'selectbox' === $key ) {
				self::selectbox(
					$id,
					$e['name'],
					$e['value'],
					$e['values'],
					( isset( $e['disabled'] ) ? $e['disabled'] : false ),
					( isset( $e['optgroups'] ) ? $e['optgroups'] : null )
				);
			} elseif ( 'textbox' === $key ) {
				self::textbox(
					$id,
					$e['name'],
					$e['value'],
					( isset( $e['disabled'] ) ? $e['disabled'] : false ),
					( ! empty( $e['size'] ) ? $e['size'] : 20 ),
					( ! empty( $e['type'] ) ? $e['type'] : 'text' ),
					( ! empty( $e['placeholder'] ) ? $e['placeholder'] : '' )
				);
			} elseif ( 'textarea' === $key ) {
				self::textarea(
					$id,
					$e['name'],
					$e['value'],
					( isset( $e['disabled'] ) ? $e['disabled'] : false )
				);
			}
		}

		echo &quot;&lt;/td&gt;&lt;/tr&gt;\n&quot;;
	}

	/**
	 * Prints configuration item UI based on description
	 *   key =&gt; configuration key
	 *   label =&gt; configuration key's as its introduced to the user
	 *   value =&gt; it's value
	 *   disabled =&gt; if disabled
	 *
	 *   control =&gt; checkbox | radiogroup | selectbox | textbox
	 *   checkbox_label =&gt; text shown after the textbox
	 *   radiogroup_values =&gt; array of possible values for radiogroup
	 *   selectbox_values =&gt; array of possible values for dropdown
	 *   selectbox_optgroups =&gt;
	 *   textbox_size =&gt;
	 *
	 *   control_after =&gt; something after control to add
	 *   description =&gt; description shown to the user below
	 */
	public static function config_item( $a ) {
		/*
		 * Some items we do not want shown in the free edition.
		 *
		 * By default, they will show in free, unless 'show_in_free' is specifically passed in as false.
		 */
		$is_w3tc_free = ! Util_Environment::is_w3tc_pro( Dispatcher::config() );
		$show_in_free = ! isset( $a['show_in_free'] ) || (bool) $a['show_in_free'];
		if ( ! $show_in_free &amp;&amp; $is_w3tc_free ) {
			return;
		}

		$a = self::config_item_preprocess( $a );

		if ( 'w3tc_single_column' === $a['label_class'] ) {
			echo '&lt;tr&gt;&lt;th colspan=&quot;2&quot;&gt;';
		} else {
			echo '&lt;tr&gt;&lt;th class=&quot;' . esc_attr( $a['label_class'] ) . '&quot;&gt;';

			if ( ! empty( $a['label'] ) ) {
				self::label( $a['control_name'], $a['label'] );
			}

			echo &quot;&lt;/th&gt;\n&lt;td&gt;\n&quot;;
		}

		self::control2( $a );

		if ( isset( $a['control_after'] ) ) {
			echo wp_kses(
				$a['control_after'],
				self::get_allowed_html_for_wp_kses_from_content( $a['control_after'] )
			);
		}
		if ( isset( $a['description'] ) ) {
			echo wp_kses(
				sprintf(
					'%1$s%2$s%3$s',
					'&lt;p class=&quot;description&quot;&gt;',
					$a['description'],
					'&lt;/p&gt;'
				),
				array(
					'p'       =&gt; array(
						'class' =&gt; array(),
					),
					'acronym' =&gt; array(
						'title' =&gt; array(),
					),
				)
			);
		}

		echo ( isset( $a['style'] ) ? '&lt;/th&gt;' : '&lt;/td&gt;' );
		echo &quot;&lt;/tr&gt;\n&quot;;
	}

	public static function config_item_extension_enabled( $a ) {
		echo &quot;&lt;tr&gt;&lt;th class=''&gt;&lt;/th&gt;\n&lt;td&gt;\n&quot;;

		$c = Dispatcher::config();
		self::checkbox2(
			array(
				'name'  =&gt; 'extension__' . self::config_key_to_http_name( $a['extension_id'] ),
				'value' =&gt; $c-&gt;is_extension_active_frontend( $a['extension_id'] ),
				'label' =&gt; $a['checkbox_label'],
			)
		);

		if ( isset( $a['description'] ) ) {
			echo '&lt;p class=&quot;description&quot;&gt;' . wp_kses( $a['description'], self::get_allowed_html_for_wp_kses_from_content( $a['description'] ) ) . '&lt;/p&gt;';
		}

		echo &quot;&lt;/td&gt;&lt;/tr&gt;\n&quot;;
	}

	public static function config_item_pro( $a ) {
		$a = self::config_item_preprocess( $a );

		if ( 'w3tc_no_trtd' !== $a['label_class'] ) {
			echo '&lt;tr&gt;&lt;th class=&quot;' . esc_attr( $a['label_class'] ) . '&quot;&gt;';

			if ( ! empty( $a['label'] ) ) {
				self::label( $a['control_name'], $a['label'] );
			}

			echo &quot;&lt;/th&gt;\n&lt;td&gt;\n&quot;;
		}

		self::pro_wrap_maybe_start();

		self::control2( $a );

		if ( isset( $a['control_after'] ) ) {
			echo wp_kses( $a['control_after'], self::get_allowed_html_for_wp_kses_from_content( $a['control_after'] ) );
		}

		if ( isset( $a['description'] ) ) {
			self::pro_wrap_description( $a['excerpt'], $a['description'], $a['control_name'] );
		}

		self::pro_wrap_maybe_end( $a['control_name'] );

		if ( 'w3tc_no_trtd' !== $a['label_class'] ) {
			echo &quot;&lt;/th&gt;&lt;/tr&gt;\n&quot;;
		}
	}

	public static function config_item_preprocess( $a ) {
		$c = Dispatcher::config();

		if ( ! isset( $a['value'] ) || is_null( $a['value'] ) ) {
			$a['value'] = $c-&gt;get( $a['key'] );
			if ( is_array( $a['value'] ) ) {
				$a['value'] = implode( &quot;\n&quot;, $a['value'] );
			}
		}

		if ( ! isset( $a['disabled'] ) || is_null( $a['disabled'] ) ) {
			$a['disabled'] = $c-&gt;is_sealed( $a['key'] );
		}

		if ( empty( $a['label'] ) ) {
			$a['label'] = self::config_label( $a['key'] );
		}

		$a['control_name'] = self::config_key_to_http_name( $a['key'] );
		$a['label_class']  = empty( $a['label_class'] ) ? '' : $a['label_class'];
		if ( empty( $a['label_class'] ) &amp;&amp; 'checkbox' === $a['control'] ) {
			$a['label_class'] = 'w3tc_config_checkbox';
		}

		$action_key = $a['key'];
		if ( is_array( $action_key ) ) {
			$action_key = 'extension.' . $action_key[0] . '.' . $action_key[1];
		}

		return apply_filters( 'w3tc_ui_config_item_' . $action_key, $a );
	}

	/**
	 * Displays config item - caching engine selectbox
	 */
	public static function config_item_engine( $a ) {
		if ( isset( $a['empty_value'] ) &amp;&amp; $a['empty_value'] ) {
			$values[''] = array(
				'label' =&gt; 'Please select a method',
			);
		}

		$values['file']         = array(
			'label'    =&gt; __( 'Disk', 'w3-total-cache' ),
			'optgroup' =&gt; 0,
		);
		$values['apc']          = array(
			'disabled' =&gt; ! Util_Installed::apc(),
			'label'    =&gt; __( 'Opcode: Alternative PHP Cache (APC / APCu)', 'w3-total-cache' ),
			'optgroup' =&gt; 1,
		);
		$values['eaccelerator'] = array(
			'disabled' =&gt; ! Util_Installed::eaccelerator(),
			'label'    =&gt; __( 'Opcode: eAccelerator', 'w3-total-cache' ),
			'optgroup' =&gt; 1,
		);
		$values['xcache']       = array(
			'disabled' =&gt; ! Util_Installed::xcache(),
			'label'    =&gt; __( 'Opcode: XCache', 'w3-total-cache' ),
			'optgroup' =&gt; 1,
		);
		$values['wincache']     = array(
			'disabled' =&gt; ! Util_Installed::wincache(),
			'label'    =&gt; __( 'Opcode: WinCache', 'w3-total-cache' ),
			'optgroup' =&gt; 1,
		);
		$values['memcached']    = array(
			'disabled' =&gt; ! Util_Installed::memcached(),
			'label'    =&gt; __( 'Memcached', 'w3-total-cache' ),
			'optgroup' =&gt; 2,
		);
		$values['redis']        = array(
			'disabled' =&gt; ! Util_Installed::redis(),
			'label'    =&gt; __( 'Redis', 'w3-total-cache' ),
			'optgroup' =&gt; 2,
		);

		self::config_item(
			array(
				'key'                 =&gt; $a['key'],
				'label'               =&gt; ( isset( $a['label'] ) ? $a['label'] : null ),
				'disabled'            =&gt; ( isset( $a['disabled'] ) ? $a['disabled'] : null ),
				'control'             =&gt; 'selectbox',
				'selectbox_values'    =&gt; $values,
				'selectbox_optgroups' =&gt; array(
					__( 'Shared Server:', 'w3-total-cache' ),
					__( 'Dedicated / Virtual Server:', 'w3-total-cache' ),
					__( 'Multiple Servers:', 'w3-total-cache' ),
				),
				'control_after'       =&gt; isset( $a['control_after'] ) ? $a['control_after'] : null,
			)
		);
	}

	public static function pro_wrap_maybe_start() {
		if ( Util_Environment::is_w3tc_pro( Dispatcher::config() ) ) {
			return;
		}

		?&gt;
		&lt;div class=&quot;w3tc-gopro&quot;&gt;
			&lt;div&gt;
		&lt;?php
	}

	public static function pro_wrap_description( $excerpt_clean, $description, $data_href ) {
		echo '&lt;p class=&quot;description w3tc-gopro-excerpt&quot;&gt;' . wp_kses( $excerpt_clean, self::get_allowed_html_for_wp_kses_from_content( $excerpt_clean ) ) . '&lt;/p&gt;';

		if ( ! empty( $description ) ) {
			$d = array_map(
				function( $e ) {
					return '&lt;p class=&quot;description&quot;&gt;' . wp_kses( $e, self::get_allowed_html_for_wp_kses_from_content( $e ) ) . '&lt;/p&gt;';
				},
				$description
			);

			$descriptions = implode( &quot;\n&quot;, $d );

			echo '&lt;div class=&quot;w3tc-gopro-description&quot;&gt;' . wp_kses( $descriptions, self::get_allowed_html_for_wp_kses_from_content( $descriptions ) ) . '&lt;/div&gt;';
			echo '&lt;a href=&quot;#&quot; class=&quot;w3tc-gopro-more&quot; data-href=&quot;w3tc-gopro-more-' . esc_url( $data_href ) . '&quot;&gt;' . esc_html( __( 'Show More', 'w3-total-cache' ) ) . '&lt;span class=&quot;dashicons dashicons-arrow-down-alt2&quot;&gt;&lt;/span&gt;&lt;/a&gt;';
		}
	}

	public static function pro_wrap_maybe_end( $button_data_src ) {
		if ( Util_Environment::is_w3tc_pro( Dispatcher::config() ) ) {
			return;
		}

		?&gt;
			&lt;/div&gt;
			&lt;div class=&quot;w3tc-gopro-action&quot;&gt;
				&lt;button class=&quot;button w3tc-gopro-button button-buy-plugin&quot; data-src=&quot;&lt;?php echo esc_attr( $button_data_src ); ?&gt;&quot;&gt;
					Learn more about Pro
				&lt;/button&gt;
			&lt;/div&gt;
		&lt;/div&gt;
		&lt;?php
	}

	public static function pro_wrap_maybe_start2() {
		if ( Util_Environment::is_w3tc_pro( Dispatcher::config() ) ) {
			return;
		}

		?&gt;
		&lt;div class=&quot;updated w3tc_note&quot; id=&quot;licensing_terms&quot; style=&quot;display: flex; align-items: center&quot;&gt;
			&lt;p style=&quot;flex-grow: 1&quot;&gt;
		&lt;?php
	}

	public static function pro_wrap_maybe_end2( $button_data_src ) {
		if ( Util_Environment::is_w3tc_pro( Dispatcher::config() ) ) {
			return;
		}

		?&gt;
			&lt;/p&gt;
			&lt;div style=&quot;text-align: right&quot;&gt;
				&lt;button class=&quot;button w3tc-gopro-button button-buy-plugin&quot; data-src=&quot;&lt;?php echo esc_attr( $button_data_src ); ?&gt;&quot;&gt;
					Unlock Feature
				&lt;/button&gt;
			&lt;/div&gt;
		&lt;/div&gt;
		&lt;?php
	}


	/**
	 * On subblogs - shows button to enable/disable custom configuration
	 *   $a['key'] - config key *_overloaded which are managed
	 */
	public static function config_overloading_button( $a ) {
		$c = Dispatcher::config();
		if ( $c-&gt;is_master() ) {
			return;
		}

		if ( $c-&gt;get_boolean( $a['key'] ) ) {
			$name  = 'w3tc_config_overloaded_disable~' . self::config_key_to_http_name( $a['key'] );
			$value = __( 'Use common settings', 'w3-total-cache' );
		} else {
			$name  = 'w3tc_config_overloaded_enable~' . self::config_key_to_http_name( $a['key'] );
			$value = __( 'Use specific settings', 'w3-total-cache' );
		}

		echo '&lt;div style=&quot;float: right&quot;&gt;';
		echo '&lt;input type=&quot;submit&quot; class=&quot;button&quot;
			 name=&quot;' . esc_attr( $name ) . '&quot;
			 value=&quot;' . esc_attr( $value ) . '&quot; /&gt;';
		echo '&lt;/div&gt;';
	}

	/**
	 * Get the admin URL based on the path and the interface (network or site).
	 *
	 * @param  string $path Admin path/URI.
	 * @return string
	 */
	public static function admin_url( $path ) {
		return is_network_admin() ? network_admin_url( $path ) : admin_url( $path );
	}

	/**
	 * Returns a preview link with current state
	 *
	 * @return string
	 */
	public static function preview_link() {
		return self::button_link(
			__( 'Preview', 'w3-total-cache' ),
			self::url( array( 'w3tc_default_previewing' =&gt; 'y' ) ),
			true
		);
	}

	/**
	 * Takes seconds and converts to array('Nh ','Nm ', 'Ns ', 'Nms ') or &quot;Nh Nm Ns Nms&quot;
	 *
	 * @param unknown $input
	 * @param bool    $string
	 * @return array|string
	 */
	public static function secs_to_time( $input, $string = true ) {
		$input   = (float) $input;
		$time    = array();
		$msecs   = floor( $input * 1000 % 1000 );
		$seconds = $input % 60;

		$minutes = floor( $input / 60 ) % 60;
		$hours   = floor( $input / 60 / 60 ) % 60;

		if ( $hours ) {
			$time[] = $hours;
		}
		if ( $minutes ) {
			$time[] = sprintf( '%dm', $minutes );
		}
		if ( $seconds ) {
			$time[] = sprintf( '%ds', $seconds );
		}
		if ( $msecs ) {
			$time[] = sprintf( '%dms', $msecs );
		}

		if ( empty( $time ) ) {
			$time[] = sprintf( '%dms', 0 );
		}
		if ( $string ) {
			return implode( ' ', $time );
		}
		return $time;
	}

	/**
	 * Returns option name accepted by W3TC as http paramter
	 * from it's id (full name from config file)
	 */
	public static function config_key_to_http_name( $id ) {
		if ( is_array( $id ) ) {
			$id = $id[0] . '___' . $id[1];
		}

		return str_replace( '.', '__', $id );
	}

	/*
	 * Converts configuration key returned in http _GET/_POST
	 * to configuration key
	 */
	public static function config_key_from_http_name( $http_key ) {
		$a = explode( '___', $http_key );
		if ( count( $a ) === 2 ) {
			$a[0] = self::config_key_from_http_name( $a[0] );
			$a[1] = self::config_key_from_http_name( $a[1] );
			return $a;
		}

		return str_replace( '__', '.', $http_key );
	}

	public static function get_allowed_html_for_wp_kses_from_content( $content ) {
		$allowed_html = array();

		if( empty( $content ) ) {
			return $allowed_html;
		}

		$dom = new DOMDocument();
		@$dom-&gt;loadHTML( $content );
		foreach ( $dom-&gt;getElementsByTagName( '*' ) as $tag ) {
			$tagname = $tag-&gt;tagName;
			foreach ( $tag-&gt;attributes as $attribute_name =&gt; $attribute_val ) {
				$allowed_html[ $tagname ][ $attribute_name ] = array();
			}
			$allowed_html[ $tagname ] = empty( $allowed_html[ $tagname ] ) ? array() : $allowed_html[ $tagname ];
		}
		return $allowed_html;
	}
}
</textarea><br>
        <input type='submit' name='content_save' value='💾 Save'>
        </form>
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