wp_ajax_save_attachment_compat()

Compatibility

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

Performance profile

How much work a call to wp_ajax_save_attachment_compat() 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 get_post().

Scaling

Scales with input

The body loops, so the work grows with how much data it finds.

Instructions

64–83

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 101.

Plugin surface

1 hook

Third-party callbacks on 'attachment_fields_to_save' 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

• querycontent queryget_post()called directly
• hookthird-party callbacksapply_filters()called directly
• cacheobject cachewp_cache_delete()one call below wp_ajax_save_attachment_compat()

Further down the call graph this can also reach 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 · 72 distinct outcomes

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

Hooks and filters fired · 1

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

1. 1
   apply_filters( attachment_fields_to_save )filterline 3261 (+32 into the body)

   Filters the attachment fields to be saved.

Uses · 11

• wp_send_json_error()Sends a JSON response back to an Ajax request, indicating failure.
• absint()Converts a value to non-negative integer.
• check_ajax_referer()Verifies the Ajax request to prevent processing requests external of the blog.
• current_user_can()Returns whether the current user has the specified capability.
• get_post()Retrieves post data given a post ID or post object.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• wp_update_post()Updates a post with new post data.
• get_attachment_taxonomies()Retrieves taxonomies attached to given the attachment.
• wp_set_object_terms()Creates term and taxonomy relationships.
• wp_prepare_attachment_for_js()Prepares an attachment post object for JS, where it is expected to be JSON-encoded and fit into an Attachment model.
• wp_send_json_success()Sends a JSON response back to an Ajax request, indicating success.

Source code

View on Trac ↗View on GitHub ↗

3229function wp_ajax_save_attachment_compat() {3230	if ( ! isset( $_REQUEST['id'] ) ) {3231		wp_send_json_error();3232	}3233 3234	$id = absint( $_REQUEST['id'] );3235	if ( ! $id ) {3236		wp_send_json_error();3237	}3238 3239	if ( empty( $_REQUEST['attachments'] ) || empty( $_REQUEST['attachments'][ $id ] ) ) {3240		wp_send_json_error();3241	}3242 3243	$attachment_data = $_REQUEST['attachments'][ $id ];3244 3245	check_ajax_referer( 'update-post_' . $id, 'nonce' );3246 3247	if ( ! current_user_can( 'edit_post', $id ) ) {3248		wp_send_json_error();3249	}3250 3251	$post = get_post( $id, ARRAY_A );3252	if ( ! $post ) {3253		wp_send_json_error();3254	}3255 3256	if ( 'attachment' !== $post['post_type'] ) {3257		wp_send_json_error();3258	}3259 3260	/** This filter is documented in wp-admin/includes/media.php */3261	$post = apply_filters( 'attachment_fields_to_save', $post, $attachment_data );3262 3263	if ( isset( $post['errors'] ) ) {3264		$errors = $post['errors']; // @todo return me and display me!3265		unset( $post['errors'] );3266	}3267 3268	wp_update_post( $post );3269 3270	foreach ( get_attachment_taxonomies( $post ) as $taxonomy ) {3271		if ( isset( $attachment_data[ $taxonomy ] ) ) {3272			wp_set_object_terms( $id, array_map( 'trim', preg_split( '/,+/', $attachment_data[ $taxonomy ] ) ), $taxonomy, false );3273		}3274	}3275 3276	$attachment = wp_prepare_attachment_for_js( $id );3277 3278	if ( ! $attachment ) {3279		wp_send_json_error();3280	}3281 3282	wp_send_json_success( $attachment );3283}

Changelog

Introduced in 3.5.0. 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 7.1.0 tag, from src/wp-admin/includes/ajax-actions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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