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if ( ! class_exists( 'acf_field' ) ) :

	#[AllowDynamicProperties]
	class acf_field {

		// field information properties.
		public $name          = '';
		public $label         = '';
		public $category      = 'basic';
		public $description   = '';
		public $doc_url       = false;
		public $tutorial_url  = false;
		public $preview_image = false;
		public $pro           = false;
		public $defaults      = array();
		public $l10n          = array();
		public $public        = true;
		public $show_in_rest  = true;

		/*
		*  __construct
		*
		*  This function will initialize the field type
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function __construct() {

			// initialize
			$this-&gt;initialize();

			// register info
			acf_register_field_type_info(
				array(
					'label'         =&gt; $this-&gt;label,
					'name'          =&gt; $this-&gt;name,
					'category'      =&gt; $this-&gt;category,
					'description'   =&gt; $this-&gt;description,
					'doc_url'       =&gt; $this-&gt;doc_url,
					'tutorial_url'  =&gt; $this-&gt;tutorial_url,
					'preview_image' =&gt; $this-&gt;preview_image,
					'pro'           =&gt; $this-&gt;pro,
					'public'        =&gt; $this-&gt;public,
				)
			);

			// value
			$this-&gt;add_field_filter( 'acf/load_value', array( $this, 'load_value' ), 10, 3 );
			$this-&gt;add_field_filter( 'acf/update_value', array( $this, 'update_value' ), 10, 3 );
			$this-&gt;add_field_filter( 'acf/format_value', array( $this, 'format_value' ), 10, 3 );
			$this-&gt;add_field_filter( 'acf/validate_value', array( $this, 'validate_value' ), 10, 4 );
			$this-&gt;add_field_action( 'acf/delete_value', array( $this, 'delete_value' ), 10, 3 );

			// field
			$this-&gt;add_field_filter( 'acf/validate_rest_value', array( $this, 'validate_rest_value' ), 10, 3 );
			$this-&gt;add_field_filter( 'acf/validate_field', array( $this, 'validate_field' ), 10, 1 );
			$this-&gt;add_field_filter( 'acf/load_field', array( $this, 'load_field' ), 10, 1 );
			$this-&gt;add_field_filter( 'acf/update_field', array( $this, 'update_field' ), 10, 1 );
			$this-&gt;add_field_filter( 'acf/duplicate_field', array( $this, 'duplicate_field' ), 10, 1 );
			$this-&gt;add_field_action( 'acf/delete_field', array( $this, 'delete_field' ), 10, 1 );
			$this-&gt;add_field_action( 'acf/render_field', array( $this, 'render_field' ), 9, 1 );
			$this-&gt;add_field_action( 'acf/render_field_settings', array( $this, 'render_field_settings' ), 9, 1 );
			$this-&gt;add_field_filter( 'acf/prepare_field', array( $this, 'prepare_field' ), 10, 1 );
			$this-&gt;add_field_filter( 'acf/translate_field', array( $this, 'translate_field' ), 10, 1 );

			// input actions
			$this-&gt;add_action( 'acf/input/admin_enqueue_scripts', array( $this, 'input_admin_enqueue_scripts' ), 10, 0 );
			$this-&gt;add_action( 'acf/input/admin_head', array( $this, 'input_admin_head' ), 10, 0 );
			$this-&gt;add_action( 'acf/input/form_data', array( $this, 'input_form_data' ), 10, 1 );
			$this-&gt;add_filter( 'acf/input/admin_l10n', array( $this, 'input_admin_l10n' ), 10, 1 );
			$this-&gt;add_action( 'acf/input/admin_footer', array( $this, 'input_admin_footer' ), 10, 1 );

			// field group actions
			$this-&gt;add_action( 'acf/field_group/admin_enqueue_scripts', array( $this, 'field_group_admin_enqueue_scripts' ), 10, 0 );
			$this-&gt;add_action( 'acf/field_group/admin_head', array( $this, 'field_group_admin_head' ), 10, 0 );
			$this-&gt;add_action( 'acf/field_group/admin_footer', array( $this, 'field_group_admin_footer' ), 10, 0 );

			foreach ( acf_get_combined_field_type_settings_tabs() as $tab_key =&gt; $tab_label ) {
				$this-&gt;add_field_action( &quot;acf/field_group/render_field_settings_tab/{$tab_key}&quot;, array( $this, &quot;render_field_{$tab_key}_settings&quot; ), 9, 1 );
			}
		}


		/*
		*  initialize
		*
		*  This function will initialize the field type
		*
		*  @type    function
		*  @date    27/6/17
		*  @since   5.6.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function initialize() {

			/* do nothing */

		}


		/*
		*  add_filter
		*
		*  This function checks if the function is_callable before adding the filter
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// bail early if no callable
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

			// add
			add_filter( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_field_filter
		*
		*  This function will add a field type specific filter
		*
		*  @type    function
		*  @date    29/09/2016
		*  @since   5.4.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_field_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// append
			$tag .= '/type=' . $this-&gt;name;

			// add
			$this-&gt;add_filter( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_action
		*
		*  This function checks if the function is_callable before adding the action
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// bail early if no callable
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

			// add
			add_action( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_field_action
		*
		*  This function will add a field type specific filter
		*
		*  @type    function
		*  @date    29/09/2016
		*  @since   5.4.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_field_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// append
			$tag .= '/type=' . $this-&gt;name;

			// add
			$this-&gt;add_action( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  validate_field
		*
		*  This function will append default settings to a field
		*
		*  @type    filter (&quot;acf/validate_field/type={$this-&gt;name}&quot;)
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field (array)
		*  @return  $field (array)
		*/

		function validate_field( $field ) {

			// bail early if no defaults
			if ( ! is_array( $this-&gt;defaults ) ) {
				return $field;
			}

			// merge in defaults but keep order of $field keys
			foreach ( $this-&gt;defaults as $k =&gt; $v ) {

				if ( ! isset( $field[ $k ] ) ) {
					$field[ $k ] = $v;
				}
			}

			// return
			return $field;

		}


		/*
		*  admin_l10n
		*
		*  This function will append l10n text translations to an array which is later passed to JS
		*
		*  @type    filter (&quot;acf/input/admin_l10n&quot;)
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $l10n (array)
		*  @return  $l10n (array)
		*/

		function input_admin_l10n( $l10n ) {

			// bail early if no defaults
			if ( empty( $this-&gt;l10n ) ) {
				return $l10n;
			}

			// append
			$l10n[ $this-&gt;name ] = $this-&gt;l10n;

			// return
			return $l10n;

		}

		/**
		 * Add additional validation for fields being updated via the REST API.
		 *
		 * @param bool  $valid
		 * @param mixed $value
		 * @param array $field
		 *
		 * @return bool|WP_Error
		 */
		public function validate_rest_value( $valid, $value, $field ) {
			return $valid;
		}

		/**
		 * Return the schema array for the REST API.
		 *
		 * @param array $field
		 * @return array
		 */
		public function get_rest_schema( array $field ) {
			$schema = array(
				'type'     =&gt; array( 'string', 'null' ),
				'required' =&gt; ! empty( $field['required'] ),
			);

			if ( isset( $field['default_value'] ) &amp;&amp; '' !== $field['default_value'] ) {
				$schema['default'] = $field['default_value'];
			}

			return $schema;
		}

		/**
		 * Return an array of links for addition to the REST API response. Each link is an array and must have both `rel` and
		 * `href` keys. The `href` key must be a REST API resource URL. If a link is marked as `embeddable`, the `_embed` URL
		 * parameter will trigger WordPress to dispatch an internal sub request and load the object within the same request
		 * under the `_embedded` response property.
		 *
		 * e.g;
		 *    [
		 *        [
		 *            'rel' =&gt; 'acf:post',
		 *            'href' =&gt; 'https://example.com/wp-json/wp/v2/posts/497',
		 *            'embeddable' =&gt; true,
		 *        ],
		 *        [
		 *            'rel' =&gt; 'acf:user',
		 *            'href' =&gt; 'https://example.com/wp-json/wp/v2/users/2',
		 *            'embeddable' =&gt; true,
		 *        ],
		 *    ]
		 *
		 * @param mixed      $value The raw (unformatted) field value.
		 * @param string|int $post_id
		 * @param array      $field
		 * @return array
		 */
		public function get_rest_links( $value, $post_id, array $field ) {
			return array();
		}

		/**
		 * Apply basic formatting to prepare the value for default REST output.
		 *
		 * @param mixed      $value
		 * @param string|int $post_id
		 * @param array      $field
		 * @return mixed
		 */
		public function format_value_for_rest( $value, $post_id, array $field ) {
			return $value;
		}

	}

endif; // class_exists check


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