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Editing: class-acf-field.php

<?php
/**
 * @package ACF
 * @author  WP Engine
 *
 * © 2026 Advanced Custom Fields (ACF®). All rights reserved.
 * "ACF" is a trademark of WP Engine.
 * Licensed under the GNU General Public License v2 or later.
 * https://www.gnu.org/licenses/gpl-2.0.html
 */

if ( ! class_exists( 'acf_field' ) ) :
	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;
		public $supports      = array(
			'escaping_html' => false, // Set true when a field handles its own HTML escaping in format_value
			'required'      => true,
		);

// Additional properties used by field types
		public $default_values = array();
		public $have_rows      = '';
		public $width          = '';
		public $height         = '';

/**
		 * Initializes the `acf_field` class. To initialize a field type that is
		 * extending this class, use the `initialize()` method in the child class instead.
		 *
		 * @since 5.0.0
		 */
		public function __construct() {
			// Initialize the field type.
			$this->initialize();

// Register info about the field type.
			acf_register_field_type_info(
				array(
					'label'         => $this->label,
					'name'          => $this->name,
					'category'      => $this->category,
					'description'   => $this->description,
					'doc_url'       => $this->doc_url,
					'tutorial_url'  => $this->tutorial_url,
					'preview_image' => $this->preview_image,
					'pro'           => $this->pro,
					'public'        => $this->public,
				)
			);

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

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

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

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

// Add field global settings configurable by supports on specific field types.
			$this->add_field_action( 'acf/field_group/render_field_settings_tab/validation', array( $this, 'render_required_setting' ), 5 );
			$this->add_field_action( 'acf/field_group/render_field_settings_tab/presentation', array( $this, 'render_bindings_setting' ), 5 );

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

/**
		 * Initializes the field type. Overridden in child classes.
		 *
		 * @since 5.6.0
		 */
		public function initialize() {
			/* do nothing */
		}

/**
		 * Checks a function `is_callable()` before adding the filter, since
		 * classes that extend `acf_field` might not implement all filters.
		 *
		 * @since 5.0.0
		 *
		 * @param string  $tag             The name of the filter to add the callback to.
		 * @param string  $function_to_add The callback to be run when the filter is applied.
		 * @param integer $priority        The priority to add the filter on.
		 * @param integer $accepted_args   The number of args to pass to the function.
		 * @return void
		 */
		public function add_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {
			// Bail early if not callable.
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

add_filter( $tag, $function_to_add, $priority, $accepted_args );
		}

/**
		 * Adds a filter specific to the current field type.
		 *
		 * @since 5.4.0
		 *
		 * @param string  $tag             The name of the filter to add the callback to.
		 * @param string  $function_to_add The callback to be run when the filter is applied.
		 * @param integer $priority        The priority to add the filter on.
		 * @param integer $accepted_args   The number of args to pass to the function.
		 * @return void
		 */
		public function add_field_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {
			// Append the field type name to the tag before adding the filter.
			$tag .= '/type=' . $this->name;
			$this->add_filter( $tag, $function_to_add, $priority, $accepted_args );
		}

/**
		 * Checks a function `is_callable()` before adding the action, since
		 * classes that extend `acf_field` might not implement all actions.
		 *
		 * @since 5.0.0
		 *
		 * @param string  $tag             The name of the action to add the callback to.
		 * @param string  $function_to_add The callback to be run when the action is ran.
		 * @param integer $priority        The priority to add the action on.
		 * @param integer $accepted_args   The number of args to pass to the function.
		 * @return void
		 */
		public function add_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {
			// Bail early if not callable
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

add_action( $tag, $function_to_add, $priority, $accepted_args );
		}

/**
		 * Adds an action specific to the current field type.
		 *
		 * @since 5.4.0
		 *
		 * @param string  $tag             The name of the action to add the callback to.
		 * @param string  $function_to_add The callback to be run when the action is ran.
		 * @param integer $priority        The priority to add the action on.
		 * @param integer $accepted_args   The number of args to pass to the function.
		 * @return void
		 */
		public function add_field_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {
			// Append the field type name to the tag before adding the action.
			$tag .= '/type=' . $this->name;
			$this->add_action( $tag, $function_to_add, $priority, $accepted_args );
		}

/**
		 * Appends default settings to a field.
		 * Runs on `acf/validate_field/type={$this->name}`.
		 *
		 * @since 3.6
		 *
		 * @param array $field The field array.
		 * @return array $field
		 */
		public function validate_field( $field ) {
			// Bail early if no defaults.
			if ( ! is_array( $this->defaults ) ) {
				return $field;
			}

// Merge in defaults but keep order of $field keys.
			foreach ( $this->defaults as $k => $v ) {
				if ( ! isset( $field[ $k ] ) ) {
					$field[ $k ] = $v;
				}
			}

return $field;
		}

/**
		 * Append l10n text translations to an array which is later passed to JS.
		 * Runs on `acf/input/admin_l10n`.
		 *
		 * @since 3.6
		 *
		 * @param array $l10n
		 * @return array $l10n
		 */
		public function input_admin_l10n( $l10n ) {
			// Bail early if no defaults.
			if ( empty( $this->l10n ) ) {
				return $l10n;
			}

// Append.
			$l10n[ $this->name ] = $this->l10n;

return $l10n;
		}

/**
		 * Add additional validation for fields being updated via the REST API.
		 *
		 * @param  boolean $valid The current validity booleean
		 * @param  integer $value The value of the field
		 * @param  array   $field The field array
		 * @return boolean|WP_Error
		 */
		public function validate_rest_value( $valid, $value, $field ) {
			return $valid;
		}

/**
		 * Returns the JSON schema for creating this field type.
		 *
		 * @since 6.8.0
		 *
		 * @return array JSON Schema definition for this field type, or an empty array if none exists.
		 */
		public function get_field_creation_schema(): array {
			$schema = acf_get_field_json_schema( $this->name );

if ( empty( $schema ) ) {
				$schema = array(
					'type'       => 'object',
					'properties' => array(
						'label' => array(
							'type'        => 'string',
							'description' => 'The label for the field',
							'minLength'   => 1,
							'required'    => true,
						),
						'type'  => array(
							'type'        => 'string',
							'enum'        => array( $this->name ),
							'description' => 'The field type',
							'required'    => true,
						),
					),
				);
			}

return $schema;
		}

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

if ( isset( $field['default_value'] ) && '' !== $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' => 'acf:post',
		 *           'href' => 'https://example.com/wp-json/wp/v2/posts/497',
		 *           'embeddable' => true,
		 *       ],
		 *       [
		 *           'rel' => 'acf:user',
		 *           'href' => 'https://example.com/wp-json/wp/v2/users/2',
		 *           'embeddable' => true,
		 *       ],
		 *   ]
		 *
		 * @param mixed          $value   The raw (unformatted) field value.
		 * @param string|integer $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|integer $post_id
		 * @param array          $field
		 * @return mixed
		 */
		public function format_value_for_rest( $value, $post_id, array $field ) {
			return $value;
		}

/**
		 * Returns an array of JSON-LD Property output types that are supported by this field type.
		 *
		 * Override in field type classes to declare supported ranges.
		 * Used to determine valid properties and output formats.
		 *
		 * @since 6.8
		 *
		 * @return string[]
		 */
		public function get_jsonld_output_types(): array {
			return array();
		}

/**
		 * Renders the "Required" setting on the field type "Validation" settings tab.
		 *
		 * @since 6.2.5
		 *
		 * @param array $field The field type being rendered.
		 * @return void
		 */
		public function render_required_setting( $field ) {
			$supports_required = acf_field_type_supports( $field['type'], 'required', true );

// Only prevent rendering if explicitly disabled.
			if ( ! $supports_required ) {
				return;
			}

acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Required', 'acf' ),
					'instructions' => '',
					'type'         => 'true_false',
					'name'         => 'required',
					'ui'           => 1,
					'class'        => 'field-required',
				),
				true
			);
		}

/**
		 * Renders the "Allow in Bindings" setting on the field type "Presentation" settings tab.
		 *
		 * @since 6.3.6
		 *
		 * @param array $field The field type being rendered.
		 * @return void
		 */
		public function render_bindings_setting( $field ) {
			$supports_bindings = acf_field_type_supports( $field['type'], 'bindings', true );

// Only prevent rendering if explicitly disabled.
			if ( ! $supports_bindings ) {
				return;
			}

/* translators: %s A "Learn More" link to documentation explaining the setting further. */
			$binding_string       = esc_html__( 'Allow content editors to access and display the field value in the editor UI using Block Bindings or the ACF Shortcode. %s', 'acf' );
			$binding_url          = '<a target="_blank" href="' . acf_add_url_utm_tags( 'https://www.advancedcustomfields.com/resources/bindings-security/', 'docs', 'field-settings' ) . '">' . esc_html__( 'Learn more.', 'acf' ) . '</a>';
			$binding_instructions = sprintf(
				$binding_string,
				$binding_url
			);

// This field setting has unique behavior. If the value isn't defined on the field object, it defaults to true, but for new fields or when changing field types, it defaults to off.
			if ( ! isset( $field['allow_in_bindings'] ) ) {
				if ( empty( $field['ID'] ) || doing_action( 'wp_ajax_acf/field_group/render_field_settings' ) ) {
					$field['allow_in_bindings'] = false;
				} else {
					$field['allow_in_bindings'] = true;
				}
			}

acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Allow Access to Value in Editor UI', 'acf' ),
					'instructions' => $binding_instructions,
					'type'         => 'true_false',
					'name'         => 'allow_in_bindings',
					'ui'           => 1,
					'class'        => 'field-show-in-bindings',
				),
				true
			);
		}
	}

endif; // class_exists check