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/**
 * Returns an array of &quot;ACF only&quot; meta for the given post_id.
 *
 * @date    9/10/18
 * @since   5.8.0
 *
 * @param mixed $post_id The post_id for this data.
 *
 * @return array
 */
function acf_get_meta( $post_id = 0 ) {

	// Allow filter to short-circuit load_value logic.
	$null = apply_filters( 'acf/pre_load_meta', null, $post_id );
	if ( $null !== null ) {
		return ( $null === '__return_null' ) ? null : $null;
	}

	// Decode $post_id for $type and $id.
	$decoded = acf_decode_post_id( $post_id );

	/**
	 * Determine CRUD function.
	 *
	 * - Relies on decoded post_id result to identify option or meta types.
	 * - Uses xxx_metadata(type) instead of xxx_type_meta() to bypass additional logic that could alter the ID.
	 */
	if ( $decoded['type'] === 'option' ) {
		$allmeta = acf_get_option_meta( $decoded['id'] );
	} else {
		$allmeta = get_metadata( $decoded['type'], $decoded['id'], '' );
	}

	// Loop over meta and check that a reference exists for each value.
	$meta = array();
	if ( $allmeta ) {
		foreach ( $allmeta as $key =&gt; $value ) {

			// If a reference exists for this value, add it to the meta array.
			if ( isset( $allmeta[ &quot;_$key&quot; ] ) ) {
				$meta[ $key ]    = $allmeta[ $key ][0];
				$meta[ &quot;_$key&quot; ] = $allmeta[ &quot;_$key&quot; ][0];
			}
		}
	}

	// Unserialized results (get_metadata does not unserialize if $key is empty).
	$meta = array_map( 'acf_maybe_unserialize', $meta );

	/**
	 * Filters the $meta array after it has been loaded.
	 *
	 * @date    25/1/19
	 * @since   5.7.11
	 *
	 * @param array  $meta    The array of loaded meta.
	 * @param string $post_id The $post_id for this meta.
	 */
	return apply_filters( 'acf/load_meta', $meta, $post_id );
}


/**
 * acf_get_option_meta
 *
 * Returns an array of meta for the given wp_option name prefix in the same format as get_post_meta().
 *
 * @date    9/10/18
 * @since   5.8.0
 *
 * @param   string $prefix The wp_option name prefix.
 * @return  array
 */
function acf_get_option_meta( $prefix = '' ) {

	// Globals.
	global $wpdb;

	// Vars.
	$meta    = array();
	$search  = &quot;{$prefix}_%&quot;;
	$_search = &quot;_{$prefix}_%&quot;;

	// Escape underscores for LIKE.
	$search  = str_replace( '_', '\_', $search );
	$_search = str_replace( '_', '\_', $_search );

	// Query database for results.
	$rows = $wpdb-&gt;get_results(
		$wpdb-&gt;prepare(
			&quot;SELECT * 
		FROM $wpdb-&gt;options 
		WHERE option_name LIKE %s 
		OR option_name LIKE %s&quot;,
			$search,
			$_search
		),
		ARRAY_A
	);

	// Loop over results and append meta (removing the $prefix from the option name).
	$len = strlen( &quot;{$prefix}_&quot; );
	foreach ( $rows as $row ) {
		$meta[ substr( $row['option_name'], $len ) ][] = $row['option_value'];
	}

	// Return results.
	return $meta;
}

/**
 * Retrieves specific metadata from the database.
 *
 * @date    16/10/2015
 * @since   5.2.3
 *
 * @param   int|string $post_id The post id.
 * @param   string     $name    The meta name.
 * @param   bool       $hidden  If the meta is hidden (starts with an underscore).
 *
 * @return  mixed
 */
function acf_get_metadata( $post_id = 0, $name = '', $hidden = false ) {
	// Allow filter to short-circuit logic.
	$null = apply_filters( 'acf/pre_load_metadata', null, $post_id, $name, $hidden );
	if ( $null !== null ) {
		return ( $null === '__return_null' ) ? null : $null;
	}

	// Decode $post_id for $type and $id.
	$decoded = acf_decode_post_id( $post_id );
	$id      = $decoded['id'];
	$type    = $decoded['type'];

	// Hidden meta uses an underscore prefix.
	$prefix = $hidden ? '_' : '';

	// Bail early if no $id (possible during new acf_form).
	if ( ! $id ) {
		return null;
	}

	// Determine CRUD function.
	// - Relies on decoded post_id result to identify option or meta types.
	// - Uses xxx_metadata(type) instead of xxx_type_meta() to bypass additional logic that could alter the ID.
	if ( $type === 'option' ) {
		return get_option( &quot;{$prefix}{$id}_{$name}&quot;, null );
	} else {
		$meta = get_metadata( $type, $id, &quot;{$prefix}{$name}&quot;, false );
		return isset( $meta[0] ) ? $meta[0] : null;
	}
}

/**
 * Updates metadata in the database.
 *
 * @date    16/10/2015
 * @since   5.2.3
 *
 * @param   int|string $post_id The post id.
 * @param   string     $name    The meta name.
 * @param   mixed      $value   The meta value.
 * @param   bool       $hidden  If the meta is hidden (starts with an underscore).
 *
 * @return  int|bool Meta ID if the key didn't exist, true on successful update, false on failure.
 */
function acf_update_metadata( $post_id = 0, $name = '', $value = '', $hidden = false ) {
	// Allow filter to short-circuit logic.
	$pre = apply_filters( 'acf/pre_update_metadata', null, $post_id, $name, $value, $hidden );
	if ( $pre !== null ) {
		return $pre;
	}

	// Decode $post_id for $type and $id.
	$decoded = acf_decode_post_id( $post_id );
	$id      = $decoded['id'];
	$type    = $decoded['type'];

	// Hidden meta uses an underscore prefix.
	$prefix = $hidden ? '_' : '';

	// Bail early if no $id (possible during new acf_form).
	if ( ! $id ) {
		return false;
	}

	// Determine CRUD function.
	// - Relies on decoded post_id result to identify option or meta types.
	// - Uses xxx_metadata(type) instead of xxx_type_meta() to bypass additional logic that could alter the ID.
	if ( $type === 'option' ) {
		$value    = wp_unslash( $value );
		$autoload = (bool) acf_get_setting( 'autoload' );
		return update_option( &quot;{$prefix}{$id}_{$name}&quot;, $value, $autoload );
	} else {
		return update_metadata( $type, $id, &quot;{$prefix}{$name}&quot;, $value );
	}
}

/**
 * Deletes metadata from the database.
 *
 * @date    16/10/2015
 * @since   5.2.3
 *
 * @param   int|string $post_id The post id.
 * @param   string     $name The meta name.
 * @param   bool       $hidden If the meta is hidden (starts with an underscore).
 *
 * @return  bool
 */
function acf_delete_metadata( $post_id = 0, $name = '', $hidden = false ) {
	// Allow filter to short-circuit logic.
	$pre = apply_filters( 'acf/pre_delete_metadata', null, $post_id, $name, $hidden );
	if ( $pre !== null ) {
		return $pre;
	}

	// Decode $post_id for $type and $id.
	$decoded = acf_decode_post_id( $post_id );
	$id      = $decoded['id'];
	$type    = $decoded['type'];

	// Hidden meta uses an underscore prefix.
	$prefix = $hidden ? '_' : '';

	// Bail early if no $id (possible during new acf_form).
	if ( ! $id ) {
		return false;
	}

	// Determine CRUD function.
	// - Relies on decoded post_id result to identify option or meta types.
	// - Uses xxx_metadata(type) instead of xxx_type_meta() to bypass additional logic that could alter the ID.
	if ( $type === 'option' ) {
		return delete_option( &quot;{$prefix}{$id}_{$name}&quot; );
	} else {
		return delete_metadata( $type, $id, &quot;{$prefix}{$name}&quot; );
	}
}

/**
 * acf_copy_postmeta
 *
 * Copies meta from one post to another. Useful for saving and restoring revisions.
 *
 * @date    25/06/2016
 * @since   5.3.8
 *
 * @param   (int|string) $from_post_id The post id to copy from.
 * @param   (int|string) $to_post_id The post id to paste to.
 * @return  void
 */
function acf_copy_metadata( $from_post_id = 0, $to_post_id = 0 ) {

	// Get all postmeta.
	$meta = acf_get_meta( $from_post_id );

	// Check meta.
	if ( $meta ) {

		// Slash data. WP expects all data to be slashed and will unslash it (fixes '\' character issues).
		$meta = wp_slash( $meta );

		// Loop over meta.
		foreach ( $meta as $name =&gt; $value ) {
			acf_update_metadata( $to_post_id, $name, $value );
		}
	}
}

/**
 * acf_copy_postmeta
 *
 * Copies meta from one post to another. Useful for saving and restoring revisions.
 *
 * @date    25/06/2016
 * @since   5.3.8
 * @deprecated 5.7.11
 *
 * @param   int $from_post_id The post id to copy from.
 * @param   int $to_post_id The post id to paste to.
 * @return  void
 */
function acf_copy_postmeta( $from_post_id = 0, $to_post_id = 0 ) {
	return acf_copy_metadata( $from_post_id, $to_post_id );
}

/**
 * acf_get_meta_field
 *
 * Returns a field using the provided $id and $post_id parameters.
 * Looks for a reference to help loading the correct field via name.
 *
 * @date    21/1/19
 * @since   5.7.10
 *
 * @param   string       $key The meta name (field name).
 * @param   (int|string) $post_id The post_id where this field's value is saved.
 * @return  (array|false) The field array.
 */
function acf_get_meta_field( $key = 0, $post_id = 0 ) {

	// Try reference.
	$field_key = acf_get_reference( $key, $post_id );

	if ( $field_key ) {
		$field = acf_get_field( $field_key );
		if ( $field ) {
			$field['name'] = $key;
			return $field;
		}
	}

	// Return false.
	return false;
}

/**
 * acf_get_metaref
 *
 * Retrieves reference metadata from the database.
 *
 * @date    16/10/2015
 * @since   5.2.3
 *
 * @param   (int|string)                                   $post_id The post id.
 * @param   string type The reference type (fields|groups).
 * @param   string                                         $name An optional specific name
 * @return  mixed
 */
function acf_get_metaref( $post_id = 0, $type = 'fields', $name = '' ) {

	// Load existing meta.
	$meta = acf_get_metadata( $post_id, &quot;_acf_$type&quot; );

	// Handle no meta.
	if ( ! $meta ) {
		return $name ? '' : array();
	}

	// Return specific reference.
	if ( $name ) {
		return isset( $meta[ $name ] ) ? $meta[ $name ] : '';

		// Or return all references.
	} else {
		return $meta;
	}
}

/**
 * acf_update_metaref
 *
 * Updates reference metadata in the database.
 *
 * @date    16/10/2015
 * @since   5.2.3
 *
 * @param   (int|string)                                   $post_id The post id.
 * @param   string type The reference type (fields|groups).
 * @param   array                                          $references An array of references.
 * @return  (int|bool) Meta ID if the key didn't exist, true on successful update, false on failure.
 */
function acf_update_metaref( $post_id = 0, $type = 'fields', $references = array() ) {

	// Get current references.
	$current = acf_get_metaref( $post_id, $type );

	// Merge in new references.
	$references = array_merge( $current, $references );

	// Simplify groups
	if ( $type === 'groups' ) {
		$references = array_values( $references );
	}

	// Remove duplicate references.
	$references = array_unique( $references );

	// Update metadata.
	return acf_update_metadata( $post_id, &quot;_acf_$type&quot;, $references );
}
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