Title: WP_Dependencies
Published: April 25, 2014
Last modified: August 20, 2026

---

# class WP_Dependencies {}

## In this article

 * [Description](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#description)
    - [See also](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#see-also)
 * [More Information](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#more-information)
    - [Stages](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#stages)
    - [Groups](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#groups)
 * [Methods](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#methods)
 * [Source](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#wp--skip-link--target)

Core base class extended to register items.

## 󠀁[Description](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#description)󠁿

### 󠀁[See also](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#see-also)󠁿

 * [_WP_Dependency](https://developer.wordpress.org/reference/classes/_wp_dependency/)

## 󠀁[More Information](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#more-information)󠁿

`WP_Dependencies` is a class defined in `[wp-includes/class.wp-dependencies.php](https://core.trac.wordpress.org/browser/tags/5.5/src/wp-includes/class.wp-dependencies.php#L0)`
that helps process items in an order defined by dependencies (a dependent item is
processed later than a dependency). It’s an abstract class in that it’s intended
to be extended, rather than used directly. `WP_Dependencies` is the base for `[WP_Scripts](https://developer.wordpress.org/reference/classes/wp_scripts/)`
and `[WP_Styles](https://developer.wordpress.org/reference/classes/wp_styles/)`,
and is a collection of `[_WP_Dependency](https://developer.wordpress.org/reference/classes/_wp_dependency/)`
s.

### 󠀁[Stages](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#stages)󠁿

An item goes through various stages of processing as various methods are called:

 1. registered: `add()`
 2. enqueued: `enqueue()`
 3. to_do: `all_deps()`
 4. done: `do_items()`

The `query()` method can be used to determine whether a given item is in a given
stage.

### 󠀁[Groups](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#groups)󠁿

Separate processing runs can be identified by different groups (identified by integers).
For example, items output in the document <head> might go in one group, while items
output in the footer may go in another. An enqueued item that was processed in a
group associated with an earlier run is skipped in later runs. The base `WP_Dependencies`
doesn’t create groups on its own; child classes must do this.

## 󠀁[Methods](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#methods)󠁿

| Name | Description | 
| [WP_Dependencies::add](https://developer.wordpress.org/reference/classes/wp_dependencies/add/) | Register an item. | 
| [WP_Dependencies::add_data](https://developer.wordpress.org/reference/classes/wp_dependencies/add_data/) | Add extra item data. | 
| [WP_Dependencies::all_deps](https://developer.wordpress.org/reference/classes/wp_dependencies/all_deps/) | Determines dependencies. | 
| [WP_Dependencies::dequeue](https://developer.wordpress.org/reference/classes/wp_dependencies/dequeue/) | Dequeue an item or items. | 
| [WP_Dependencies::do_item](https://developer.wordpress.org/reference/classes/wp_dependencies/do_item/) | Processes a dependency. | 
| [WP_Dependencies::do_items](https://developer.wordpress.org/reference/classes/wp_dependencies/do_items/) | Processes the items and dependencies. | 
| [WP_Dependencies::enqueue](https://developer.wordpress.org/reference/classes/wp_dependencies/enqueue/) | Queue an item or items. | 
| [WP_Dependencies::get_data](https://developer.wordpress.org/reference/classes/wp_dependencies/get_data/) | Get extra item data. | 
| [WP_Dependencies::get_dependency_warning_message](https://developer.wordpress.org/reference/classes/wp_dependencies/get_dependency_warning_message/) | Gets a dependency warning message for a handle. | 
| [WP_Dependencies::get_etag](https://developer.wordpress.org/reference/classes/wp_dependencies/get_etag/) | Get etag header for cache validation. | 
| [WP_Dependencies::query](https://developer.wordpress.org/reference/classes/wp_dependencies/query/) | Query the list for an item. | 
| [WP_Dependencies::recurse_deps](https://developer.wordpress.org/reference/classes/wp_dependencies/recurse_deps/) | Recursively search the passed dependency tree for a handle. | 
| [WP_Dependencies::remove](https://developer.wordpress.org/reference/classes/wp_dependencies/remove/) | Un-register an item or items. | 
| [WP_Dependencies::set_group](https://developer.wordpress.org/reference/classes/wp_dependencies/set_group/) | Set item group, unless already in a lower group. |

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#source)󠁿

    ```php
    #[AllowDynamicProperties]
    class WP_Dependencies {
    	/**
    	 * An array of all registered dependencies keyed by handle.
    	 *
    	 * @since 2.6.8
    	 *
    	 * @var _WP_Dependency[]
    	 */
    	public $registered = array();

    	/**
    	 * An array of handles of queued dependencies.
    	 *
    	 * @since 2.6.8
    	 *
    	 * @var string[]
    	 */
    	public $queue = array();

    	/**
    	 * An array of handles of dependencies to queue.
    	 *
    	 * @since 2.6.0
    	 *
    	 * @var string[]
    	 */
    	public $to_do = array();

    	/**
    	 * An array of handles of dependencies already queued.
    	 *
    	 * @since 2.6.0
    	 *
    	 * @var string[]
    	 */
    	public $done = array();

    	/**
    	 * An array of additional arguments passed when a handle is registered.
    	 *
    	 * The keys are dependency handles and the values are query strings which are appended to the item URL's query
    	 * string, after the `ver` if provided.
    	 *
    	 * @since 2.6.0
    	 *
    	 * @var array<string, string>
    	 */
    	public $args = array();

    	/**
    	 * An array of dependency groups to enqueue.
    	 *
    	 * Each entry is keyed by handle and represents the integer group level or boolean
    	 * false if the handle has no group.
    	 *
    	 * @since 2.8.0
    	 *
    	 * @var (int|false)[]
    	 */
    	public $groups = array();

    	/**
    	 * A handle group to enqueue.
    	 *
    	 * @since 2.8.0
    	 *
    	 * @deprecated 4.5.0
    	 * @var int
    	 */
    	public $group = 0;

    	/**
    	 * Cached lookup array of flattened queued items and dependencies.
    	 *
    	 * @since 5.4.0
    	 *
    	 * @var ?array<string, true>
    	 */
    	private $all_queued_deps;

    	/**
    	 * List of assets enqueued before details were registered.
    	 *
    	 * @since 5.9.0
    	 *
    	 * @var array<string, string|null>
    	 */
    	private $queued_before_register = array();

    	/**
    	 * List of handles for dependencies encountered which themselves have missing dependencies.
    	 *
    	 * A dependency handle is added to this list when it is discovered to have missing dependencies. At this time, a
    	 * warning is emitted with _doing_it_wrong(). The handle is then added to this list, so that duplicate
    	 * warnings don't occur.
    	 *
    	 * @since 6.9.1
    	 * @var string[]
    	 */
    	private $dependencies_with_missing_dependencies = array();

    	/**
    	 * Processes the items and dependencies.
    	 *
    	 * Processes the items passed to it or the queue, and their dependencies.
    	 *
    	 * @since 2.6.0
    	 * @since 2.8.0 Added the `$group` parameter.
    	 *
    	 * @param string|string[]|false $handles Optional. Items to be processed: queue (false),
    	 *                                       single item (string), or multiple items (array of strings).
    	 *                                       Default false.
    	 * @param int|false             $group   Optional. Group level: level (int), no group (false).
    	 * @return string[] Array of handles of items that have been processed.
    	 */
    	public function do_items( $handles = false, $group = false ) {
    		/*
    		 * If nothing is passed, print the queue. If a string is passed,
    		 * print that item. If an array is passed, print those items.
    		 */
    		$handles = false === $handles ? $this->queue : (array) $handles;
    		$this->all_deps( $handles );

    		foreach ( $this->to_do as $key => $handle ) {
    			if ( ! in_array( $handle, $this->done, true ) && isset( $this->registered[ $handle ] ) ) {
    				/*
    				 * Attempt to process the item. If successful,
    				 * add the handle to the done array.
    				 *
    				 * Unset the item from the to_do array.
    				 */
    				if ( $this->do_item( $handle, $group ) ) {
    					$this->done[] = $handle;
    				}

    				unset( $this->to_do[ $key ] );
    			}
    		}

    		return $this->done;
    	}

    	/**
    	 * Processes a dependency.
    	 *
    	 * @since 2.6.0
    	 * @since 5.5.0 Added the `$group` parameter.
    	 *
    	 * @param string    $handle Name of the item. Should be unique.
    	 * @param int|false $group  Optional. Group level: level (int), no group (false).
    	 *                          Default false.
    	 * @return bool True on success, false if not set.
    	 */
    	public function do_item( $handle, $group = false ) {
    		return isset( $this->registered[ $handle ] );
    	}

    	/**
    	 * Determines dependencies.
    	 *
    	 * Recursively builds an array of items to process taking
    	 * dependencies into account. Does NOT catch infinite loops.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 * @since 2.8.0 Added the `$group` parameter.
    	 *
    	 * @param string|string[] $handles   Item handle (string) or item handles (array of strings).
    	 * @param bool            $recursion Optional. Internal flag that function is calling itself.
    	 *                                   Default false.
    	 * @param int|false       $group     Optional. Group level: level (int), no group (false).
    	 *                                   Default false.
    	 * @return bool True on success, false on failure.
    	 */
    	public function all_deps( $handles, $recursion = false, $group = false ) {
    		$handles = (array) $handles;
    		if ( ! $handles ) {
    			return false;
    		}

    		foreach ( $handles as $handle ) {
    			$handle_parts = explode( '?', $handle );
    			$handle       = $handle_parts[0];
    			$queued       = in_array( $handle, $this->to_do, true );

    			if ( in_array( $handle, $this->done, true ) ) { // Already done.
    				continue;
    			}

    			$moved     = $this->set_group( $handle, $recursion, $group );
    			$new_group = $this->groups[ $handle ];

    			if ( $queued && ! $moved ) { // Already queued and in the right group.
    				continue;
    			}

    			$keep_going           = true;
    			$missing_dependencies = array();
    			if ( isset( $this->registered[ $handle ] ) && count( $this->registered[ $handle ]->deps ) > 0 ) {
    				$missing_dependencies = array_diff( $this->registered[ $handle ]->deps, array_keys( $this->registered ) );
    			}
    			if ( ! isset( $this->registered[ $handle ] ) ) {
    				$keep_going = false; // Item doesn't exist.
    			} elseif ( count( $missing_dependencies ) > 0 ) {
    				if ( ! in_array( $handle, $this->dependencies_with_missing_dependencies, true ) ) {
    					_doing_it_wrong(
    						get_class( $this ) . '::add',
    						$this->get_dependency_warning_message( $handle, $missing_dependencies ),
    						'6.9.1'
    					);
    					$this->dependencies_with_missing_dependencies[] = $handle;
    				}
    				$keep_going = false; // Item requires dependencies that don't exist.
    			} elseif ( $this->registered[ $handle ]->deps && ! $this->all_deps( $this->registered[ $handle ]->deps, true, $new_group ) ) {
    				$keep_going = false; // Item requires dependencies that don't exist.
    			}

    			if ( ! $keep_going ) { // Either item or its dependencies don't exist.
    				if ( $recursion ) {
    					return false; // Abort this branch.
    				} else {
    					continue; // We're at the top level. Move on to the next one.
    				}
    			}

    			if ( $queued ) { // Already grabbed it and its dependencies.
    				continue;
    			}

    			if ( isset( $handle_parts[1] ) ) {
    				$this->args[ $handle ] = $handle_parts[1];
    			}

    			$this->to_do[] = $handle;
    		}

    		return true;
    	}

    	/**
    	 * Register an item.
    	 *
    	 * Registers the item if no item of that name already exists.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 *
    	 * @param string           $handle Name of the item. Should be unique.
    	 * @param string|false     $src    Full URL of the item, or path of the item relative
    	 *                                 to the WordPress root directory. If source is set to false,
    	 *                                 the item is an alias of other items it depends on.
    	 * @param string[]         $deps   Optional. An array of registered item handles this item depends on.
    	 *                                 Default empty array.
    	 * @param string|bool|null $ver    Optional. String specifying item version number, if it has one,
    	 *                                 which is added to the URL as a query string for cache busting purposes.
    	 *                                 If version is set to false, a version number is automatically added
    	 *                                 equal to current installed WordPress version.
    	 *                                 If set to null, no version is added.
    	 * @param mixed            $args   Optional. Custom property of the item. NOT the class property $args.
    	 *                                 Examples: $media, $in_footer.
    	 * @return bool Whether the item has been registered. True on success, false on failure.
    	 */
    	public function add( $handle, $src, $deps = array(), $ver = false, $args = null ) {
    		if ( isset( $this->registered[ $handle ] ) ) {
    			return false;
    		}
    		$this->registered[ $handle ] = new _WP_Dependency( $handle, $src, $deps, $ver, $args );

    		// If the item was enqueued before the details were registered, enqueue it now.
    		if ( array_key_exists( $handle, $this->queued_before_register ) ) {
    			if ( ! is_null( $this->queued_before_register[ $handle ] ) ) {
    				$this->enqueue( $handle . '?' . $this->queued_before_register[ $handle ] );
    			} else {
    				$this->enqueue( $handle );
    			}

    			unset( $this->queued_before_register[ $handle ] );
    		}

    		return true;
    	}

    	/**
    	 * Add extra item data.
    	 *
    	 * Adds data to a registered item.
    	 *
    	 * @since 2.6.0
    	 *
    	 * @param string $handle Name of the item. Should be unique.
    	 * @param string $key    The data key.
    	 * @param mixed  $value  The data value.
    	 * @return bool True on success, false on failure.
    	 */
    	public function add_data( $handle, $key, $value ) {
    		if ( ! isset( $this->registered[ $handle ] ) ) {
    			return false;
    		}
    		if ( 'conditional' === $key && '_required-conditional-dependency_' !== $value ) {
    			_deprecated_argument(
    				'WP_Dependencies->add_data()',
    				'6.9.0',
    				__( 'IE conditional comments are ignored by all supported browsers.' )
    			);
    		}

    		return $this->registered[ $handle ]->add_data( $key, $value );
    	}

    	/**
    	 * Get extra item data.
    	 *
    	 * Gets data associated with a registered item.
    	 *
    	 * @since 3.3.0
    	 *
    	 * @param string $handle Name of the item. Should be unique.
    	 * @param string $key    The data key.
    	 * @return mixed Extra item data (string), false otherwise.
    	 */
    	public function get_data( $handle, $key ) {
    		if ( ! isset( $this->registered[ $handle ] ) ) {
    			return false;
    		}

    		if ( ! isset( $this->registered[ $handle ]->extra[ $key ] ) ) {
    			return false;
    		}

    		return $this->registered[ $handle ]->extra[ $key ];
    	}

    	/**
    	 * Un-register an item or items.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 *
    	 * @param string|string[] $handles Item handle (string) or item handles (array of strings).
    	 */
    	public function remove( $handles ) {
    		foreach ( (array) $handles as $handle ) {
    			unset( $this->registered[ $handle ] );
    		}
    	}

    	/**
    	 * Queue an item or items.
    	 *
    	 * Decodes handles and arguments, then queues handles and stores
    	 * arguments in the class property $args. For example in extending
    	 * classes, $args is appended to the item url as a query string.
    	 * Note $args is NOT the $args property of items in the $registered array.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 *
    	 * @param string|string[] $handles Item handle (string) or item handles (array of strings).
    	 */
    	public function enqueue( $handles ) {
    		foreach ( (array) $handles as $handle ) {
    			$handle = explode( '?', $handle );

    			if ( ! in_array( $handle[0], $this->queue, true ) && isset( $this->registered[ $handle[0] ] ) ) {
    				$this->queue[] = $handle[0];

    				// Reset all dependencies so they must be recalculated in recurse_deps().
    				$this->all_queued_deps = null;

    				if ( isset( $handle[1] ) ) {
    					$this->args[ $handle[0] ] = $handle[1];
    				}
    			} elseif ( ! isset( $this->registered[ $handle[0] ] ) ) {
    				$this->queued_before_register[ $handle[0] ] = null; // $args

    				if ( isset( $handle[1] ) ) {
    					$this->queued_before_register[ $handle[0] ] = $handle[1];
    				}
    			}
    		}
    	}

    	/**
    	 * Dequeue an item or items.
    	 *
    	 * Decodes handles and arguments, then dequeues handles
    	 * and removes arguments from the class property $args.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 *
    	 * @param string|string[] $handles Item handle (string) or item handles (array of strings).
    	 */
    	public function dequeue( $handles ) {
    		foreach ( (array) $handles as $handle ) {
    			$handle = explode( '?', $handle );
    			$key    = array_search( $handle[0], $this->queue, true );

    			if ( false !== $key ) {
    				// Reset all dependencies so they must be recalculated in recurse_deps().
    				$this->all_queued_deps = null;

    				unset( $this->queue[ $key ] );
    				unset( $this->args[ $handle[0] ] );
    			} elseif ( array_key_exists( $handle[0], $this->queued_before_register ) ) {
    				unset( $this->queued_before_register[ $handle[0] ] );
    			}
    		}
    	}

    	/**
    	 * Recursively search the passed dependency tree for a handle.
    	 *
    	 * @since 4.0.0
    	 *
    	 * @param string[] $queue  An array of queued _WP_Dependency handles.
    	 * @param string   $handle Name of the item. Should be unique.
    	 * @return bool Whether the handle is found after recursively searching the dependency tree.
    	 */
    	protected function recurse_deps( $queue, $handle ) {
    		if ( isset( $this->all_queued_deps ) ) {
    			return isset( $this->all_queued_deps[ $handle ] );
    		}

    		$all_deps = array_fill_keys( $queue, true );
    		$queues   = array();
    		$done     = array();

    		while ( $queue ) {
    			foreach ( $queue as $queued ) {
    				if ( ! isset( $done[ $queued ] ) && isset( $this->registered[ $queued ] ) ) {
    					$deps = $this->registered[ $queued ]->deps;
    					if ( $deps ) {
    						$all_deps += array_fill_keys( $deps, true );
    						array_push( $queues, $deps );
    					}
    					$done[ $queued ] = true;
    				}
    			}
    			$queue = array_pop( $queues );
    		}

    		$this->all_queued_deps = $all_deps;

    		return isset( $this->all_queued_deps[ $handle ] );
    	}

    	/**
    	 * Query the list for an item.
    	 *
    	 * @since 2.1.0
    	 * @since 2.6.0 Moved from `WP_Scripts`.
    	 *
    	 * @param string $handle Name of the item. Should be unique.
    	 * @param string $status Optional. Status of the item to query. Default 'registered'.
    	 * @return bool|_WP_Dependency Found, or object Item data.
    	 */
    	public function query( $handle, $status = 'registered' ) {
    		switch ( $status ) {
    			case 'registered':
    			case 'scripts': // Back compat.
    				return $this->registered[ $handle ] ?? false;

    			case 'enqueued':
    			case 'queue': // Back compat.
    				if ( in_array( $handle, $this->queue, true ) ) {
    					return true;
    				}
    				return $this->recurse_deps( $this->queue, $handle );

    			case 'to_do':
    			case 'to_print': // Back compat.
    				return in_array( $handle, $this->to_do, true );

    			case 'done':
    			case 'printed': // Back compat.
    				return in_array( $handle, $this->done, true );
    		}

    		return false;
    	}

    	/**
    	 * Set item group, unless already in a lower group.
    	 *
    	 * @since 2.8.0
    	 *
    	 * @param string    $handle    Name of the item. Should be unique.
    	 * @param bool      $recursion Internal flag that calling function was called recursively.
    	 * @param int|false $group     Group level: level (int), no group (false).
    	 * @return bool Not already in the group or a lower group.
    	 */
    	public function set_group( $handle, $recursion, $group ) {
    		$group = (int) $group;

    		if ( isset( $this->groups[ $handle ] ) && $this->groups[ $handle ] <= $group ) {
    			return false;
    		}

    		$this->groups[ $handle ] = $group;

    		return true;
    	}

    	/**
    	 * Get etag header for cache validation.
    	 *
    	 * @since 6.7.0
    	 *
    	 * @global string $wp_version The WordPress version string.
    	 *
    	 * @param string[] $load Array of script or style handles to load.
    	 * @return string Etag header.
    	 */
    	public function get_etag( $load ) {
    		/*
    		 * Note: wp_get_wp_version() is not used here, as this file can be included
    		 * via wp-admin/load-scripts.php or wp-admin/load-styles.php, in which case
    		 * wp-includes/functions.php is not loaded.
    		 */
    		global $wp_version;

    		$etag = "WP:{$wp_version};";

    		foreach ( $load as $handle ) {
    			if ( ! array_key_exists( $handle, $this->registered ) ) {
    				continue;
    			}

    			$ver   = $this->registered[ $handle ]->ver ?? $wp_version;
    			$etag .= "{$handle}:{$ver};";
    		}

    		/*
    		 * This is not intended to be cryptographically secure, just a fast way to get
    		 * a fixed length string based on the script versions. As this file does not
    		 * load the full WordPress environment, it is not possible to use the salted
    		 * wp_hash() function.
    		 */
    		return 'W/"' . md5( $etag ) . '"';
    	}

    	/**
    	 * Gets a dependency warning message for a handle.
    	 *
    	 * @since 6.9.1
    	 *
    	 * @param string   $handle                     Handle with missing dependencies.
    	 * @param string[] $missing_dependency_handles Missing dependency handles.
    	 * @return string Formatted, localized warning message.
    	 */
    	protected function get_dependency_warning_message( $handle, $missing_dependency_handles ) {
    		return sprintf(
    			/* translators: 1: Handle, 2: List of missing dependency handles. */
    			__( 'The handle "%1$s" was enqueued with dependencies that are not registered: %2$s.' ),
    			$handle,
    			implode( wp_get_list_item_separator(), $missing_dependency_handles )
    		);
    	}
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes_class-wp-dependencies-php-2/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.1/src/wp-includes/class-wp-dependencies.php#L18)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.1/src/wp-includes/class-wp-dependencies.php#L18-L578)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#related)󠁿

| Used by | Description | 
| [WP_Styles](https://developer.wordpress.org/reference/classes/wp_styles/)`wp-includes/class-wp-styles.php` |

Core class used to register styles.

  | 
| [WP_Scripts](https://developer.wordpress.org/reference/classes/wp_scripts/)`wp-includes/class-wp-scripts.php` |

Core class used to register scripts.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wp_dependencies/?output_format=md#changelog)󠁿

| Version | Description | 
| [2.6.0](https://developer.wordpress.org/reference/since/2.6.0/) | Introduced. |

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