wp_ajax_parse_embed()

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_parse_embed() 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

82–173

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 229.

Plugin surface

None

Nothing here hands control to plugin code.

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()one call below wp_ajax_parse_embed()

Further down the call graph this can also reach option, cache, 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_parse_embed() can have, taken from its control-flow graph on PHP 8.5.

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Uses · 18

• wp_send_json_error()Sends a JSON response back to an Ajax request, indicating failure.
• get_post()Retrieves post data given a post ID or post object.
• current_user_can()Returns whether the current user has the specified capability.
• setup_postdata()Set up global post data.
• wp_unslash()Removes slashes from a string or recursively removes slashes from strings within an array.
• get_shortcode_regex()Retrieves the shortcode regular expression for searching.
• shortcode_parse_atts()Retrieves all attributes from the shortcodes tag.
• is_ssl()Determines if SSL is used.
• str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
• __()Retrieves the translation of $text.
• esc_html()Escaping for HTML blocks.
• has_shortcode()Determines whether the passed content contains the specified shortcode.

Source code

View on Trac ↗View on GitHub ↗

3746function wp_ajax_parse_embed() {3747	global $post, $wp_embed, $content_width;3748 3749	if ( empty( $_POST['shortcode'] ) ) {3750		wp_send_json_error();3751	}3752 3753	$post_id = isset( $_POST['post_ID'] ) ? (int) $_POST['post_ID'] : 0;3754 3755	if ( $post_id > 0 ) {3756		$post = get_post( $post_id );3757 3758		if ( ! $post || ! current_user_can( 'edit_post', $post->ID ) ) {3759			wp_send_json_error();3760		}3761		setup_postdata( $post );3762	} elseif ( ! current_user_can( 'edit_posts' ) ) { // See WP_oEmbed_Controller::get_proxy_item_permissions_check().3763		wp_send_json_error();3764	}3765 3766	$shortcode = wp_unslash( $_POST['shortcode'] );3767 3768	preg_match( '/' . get_shortcode_regex() . '/s', $shortcode, $matches );3769	$atts = shortcode_parse_atts( $matches[3] );3770 3771	if ( ! empty( $matches[5] ) ) {3772		$url = $matches[5];3773	} elseif ( ! empty( $atts['src'] ) ) {3774		$url = $atts['src'];3775	} else {3776		$url = '';3777	}3778 3779	$parsed                         = false;3780	$wp_embed->return_false_on_fail = true;3781 3782	if ( 0 === $post_id ) {3783		/*3784		 * Refresh oEmbeds cached outside of posts that are past their TTL.3785		 * Posts are excluded because they have separate logic for refreshing3786		 * their post meta caches. See WP_Embed::cache_oembed().3787		 */3788		$wp_embed->usecache = false;3789	}3790 3791	if ( is_ssl() && str_starts_with( $url, 'http://' ) ) {3792		/*3793		 * Admin is ssl and the user pasted non-ssl URL.3794		 * Check if the provider supports ssl embeds and use that for the preview.3795		 */3796		$ssl_shortcode = preg_replace( '%^(\\[embed[^\\]]*\\])http://%i', '$1https://', $shortcode );3797		$parsed        = $wp_embed->run_shortcode( $ssl_shortcode );3798 3799		if ( ! $parsed ) {3800			$no_ssl_support = true;3801		}3802	}3803 3804	// Set $content_width so any embeds fit in the destination iframe.3805	if ( isset( $_POST['maxwidth'] ) && is_numeric( $_POST['maxwidth'] ) && $_POST['maxwidth'] > 0 ) {3806		if ( ! isset( $content_width ) ) {3807			$content_width = (int) $_POST['maxwidth'];3808		} else {3809			$content_width = min( $content_width, (int) $_POST['maxwidth'] );3810		}3811	}3812 3813	if ( $url && ! $parsed ) {3814		$parsed = $wp_embed->run_shortcode( $shortcode );3815	}3816 3817	if ( ! $parsed ) {3818		wp_send_json_error(3819			array(3820				'type'    => 'not-embeddable',3821				/* translators: %s: URL that could not be embedded. */3822				'message' => sprintf( __( '%s failed to embed.' ), '<code>' . esc_html( $url ) . '</code>' ),3823			)3824		);3825	}

Changelog

Introduced in 4.0.0. 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 6.7.7 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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