wp_media_attach_action( int $parent_id, string $action = 'attach' )

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$parent_idint

Attachment parent ID.

$actionstringoptional

Attach/detach action. Accepts 'attach' or 'detach'.
Default 'attach'.Default: 'attach'

Performance profile

How much work a call to wp_media_attach_action() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Heavy

Reaches the database via ->query().

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

5–76

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 108.

Plugin surface

1 hook

Third-party callbacks on 'wp_media_attach_action' run inside this call, and their cost is not bounded by anything here.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

• hookthird-party callbacksdo_action()called directly
• sqldatabase query->query()called directly
• cacheobject cachewp_cache_delete()one call below wp_media_attach_action()

Further down the call graph this can also reach query, option, serialize and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 19 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_media_attach_action() can have, taken from its control-flow graph on PHP 8.5.

Hooks and filters fired · 1

One hook fires while wp_media_attach_action() runs, in this order:

1. 1
   do_action( wp_media_attach_action )actionline 3883 (+44 into the body)

   Fires when media is attached or detached from a post.

Uses · 10

• current_user_can()Returns whether the current user has the specified capability.
• wp_die()Kills WordPress execution and displays HTML page with an error message.
• __()Retrieves the translation of $text.
• do_action()Calls the callback functions that have been added to an action hook.
• clean_attachment_cache()Will clean the attachment in the cache.
• wp_get_referer()Retrieves referer from '_wp_http_referer' or HTTP referer.
• str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
• remove_query_arg()Removes an item or items from a query string.
• add_query_arg()Retrieves a modified URL query string.
• wp_redirect()Redirects to another page.

Source code

View on Trac ↗View on GitHub ↗

3839function wp_media_attach_action( $parent_id, $action = 'attach' ) {3840	global $wpdb;3841 3842	if ( ! $parent_id ) {3843		return;3844	}3845 3846	if ( ! current_user_can( 'edit_post', $parent_id ) ) {3847		wp_die( __( 'Sorry, you are not allowed to edit this post.' ) );3848	}3849 3850	$ids = array();3851 3852	foreach ( (array) $_REQUEST['media'] as $attachment_id ) {3853		$attachment_id = (int) $attachment_id;3854 3855		if ( ! current_user_can( 'edit_post', $attachment_id ) ) {3856			continue;3857		}3858 3859		$ids[] = $attachment_id;3860	}3861 3862	if ( ! empty( $ids ) ) {3863		$ids_string = implode( ',', $ids );3864 3865		if ( 'attach' === $action ) {3866			$result = $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET post_parent = %d WHERE post_type = 'attachment' AND ID IN ( $ids_string )", $parent_id ) );3867		} else {3868			$result = $wpdb->query( "UPDATE $wpdb->posts SET post_parent = 0 WHERE post_type = 'attachment' AND ID IN ( $ids_string )" );3869		}3870	}3871 3872	if ( isset( $result ) ) {3873		foreach ( $ids as $attachment_id ) {3874			/**3875			 * Fires when media is attached or detached from a post.3876			 *3877			 * @since 5.5.03878			 *3879			 * @param string $action        Attach/detach action. Accepts 'attach' or 'detach'.3880			 * @param int    $attachment_id The attachment ID.3881			 * @param int    $parent_id     Attachment parent ID.3882			 */3883			do_action( 'wp_media_attach_action', $action, $attachment_id, $parent_id );3884 3885			clean_attachment_cache( $attachment_id );3886		}3887 3888		$location = 'upload.php';3889		$referer  = wp_get_referer();3890 3891		if ( $referer ) {3892			if ( str_contains( $referer, 'upload.php' ) ) {3893				$location = remove_query_arg( array( 'attached', 'detach' ), $referer );3894			}3895		}3896 3897		$key      = 'attach' === $action ? 'attached' : 'detach';3898		$location = add_query_arg( array( $key => $result ), $location );3899 3900		wp_redirect( $location );3901		exit;3902	}3903}

Changelog

Introduced in 4.2.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.0.4 tag, from src/wp-admin/includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

Something wrong on this page? Report it and it gets fixed in the next regeneration.