_prime_post_parent_id_caches( int[] $ids )

Compatibility

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

Parameters

$idsint[]

ID list.

Performance profile

How much work a call to _prime_post_parent_id_caches() 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_results().

Scaling

Scales with input

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

Instructions

19–65

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 84.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What it touches

• cacheobject cachewp_cache_get_multiple()called directly
• sqldatabase query->get_results()called directly

What one call costs · 4 distinct outcomes

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

Uses · 2

• wp_cache_get_multiple()Retrieves multiple values from the cache in one call.
• wp_cache_add_multiple()Adds multiple values to the cache in one call, if the cache keys don't already exist.

Used by · 1

• WP_Query::get_posts()Retrieves an array of posts based on query variables.

Source code

View on Trac ↗View on GitHub ↗

8527function _prime_post_parent_id_caches( array $ids ) {8528	global $wpdb;8529 8530	$ids = array_filter( $ids, '_validate_cache_id' );8531	$ids = array_unique( array_map( 'intval', $ids ), SORT_NUMERIC );8532 8533	if ( empty( $ids ) ) {8534		return;8535	}8536 8537	$cache_keys = array();8538	foreach ( $ids as $id ) {8539		$cache_keys[ $id ] = 'post_parent:' . (string) $id;8540	}8541 8542	$cached_data = wp_cache_get_multiple( array_values( $cache_keys ), 'posts' );8543 8544	$non_cached_ids = array();8545	foreach ( $cache_keys as $id => $cache_key ) {8546		if ( false === $cached_data[ $cache_key ] ) {8547			$non_cached_ids[] = $id;8548		}8549	}8550 8551	if ( ! empty( $non_cached_ids ) ) {8552		$fresh_posts = $wpdb->get_results( sprintf( "SELECT $wpdb->posts.ID, $wpdb->posts.post_parent FROM $wpdb->posts WHERE ID IN (%s)", implode( ',', $non_cached_ids ) ) );8553 8554		if ( $fresh_posts ) {8555			$post_parent_data = array();8556			foreach ( $fresh_posts as $fresh_post ) {8557				$post_parent_data[ 'post_parent:' . (string) $fresh_post->ID ] = (int) $fresh_post->post_parent;8558			}8559 8560			wp_cache_add_multiple( $post_parent_data, 'posts' );8561		}8562	}8563}

Changelog

Introduced in 6.4.0. 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-includes/post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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