_find_post_by_old_slug( string $post_type ): int

Compatibility

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

Parameters

$post_typestring

The current post type based on the query vars.

Return value

int

The Post ID.

Performance profile

How much work a call to _find_post_by_old_slug() 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_var().

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

51–83

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 85.

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_last_changed()called directly
• sqldatabase query->get_var()called directly

Further down the call graph this can also reach hook. That is the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 16 distinct outcomes

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

Uses · 4

• get_query_var()Retrieves the value of a query variable in the WP_Query class.
• wp_cache_get_last_changed()Gets last changed date for the specified cache group.
• wp_cache_get()Retrieves the cache contents from the cache by key and group.
• wp_cache_set()Saves the data to the cache.

Used by · 1

• wp_old_slug_redirect()Redirect old slugs to the correct permalink.

Source code

View on Trac ↗View on GitHub ↗

1137function _find_post_by_old_slug( $post_type ) {1138	global $wpdb;1139 1140	$query = $wpdb->prepare( "SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) );1141 1142	/*1143	 * If year, monthnum, or day have been specified, make our query more precise1144	 * just in case there are multiple identical _wp_old_slug values.1145	 */1146	if ( get_query_var( 'year' ) ) {1147		$query .= $wpdb->prepare( ' AND YEAR(post_date) = %d', get_query_var( 'year' ) );1148	}1149	if ( get_query_var( 'monthnum' ) ) {1150		$query .= $wpdb->prepare( ' AND MONTH(post_date) = %d', get_query_var( 'monthnum' ) );1151	}1152	if ( get_query_var( 'day' ) ) {1153		$query .= $wpdb->prepare( ' AND DAYOFMONTH(post_date) = %d', get_query_var( 'day' ) );1154	}1155 1156	$key          = md5( $query );1157	$last_changed = wp_cache_get_last_changed( 'posts' );1158	$cache_key    = "find_post_by_old_slug:$key:$last_changed";1159	$cache        = wp_cache_get( $cache_key, 'post-queries' );1160	if ( false !== $cache ) {1161		$id = $cache;1162	} else {1163		$id = (int) $wpdb->get_var( $query );1164		wp_cache_set( $cache_key, $id, 'post-queries' );1165	}1166 1167	return $id;1168}

Changelog

Introduced in 4.9.3. 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 6.8.8 tag, from src/wp-includes/query.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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