WP_Query::generate_cache_key( array $args, string $sql ): string
- Since
- 6.1.0
- Source
wp-includes/class-wp-query.php:5010
Compatibility
- WordPress
- since 6.1.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Parameters
$argsarray- Query arguments.
$sqlstring- SQL statement.
Return value
string- Cache key.
Performance profile
How much work a call to WP_Query::generate_cache_key() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 6–12
- Plugin surface
- None
- Called by
- 1
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 138.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Query::generate_cache_key() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 6–8 | none |
is_string($value) && $value | 12 | ->remove_placeholder_escape() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 138 | 6–12 | 14 | |
| 8.5 | 138 | 6–12 | 14 | |
| 8.4 | 138 | 6–12 | 14 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 141 | 6–15 | 14 | |
| 8.2 | 141 | 6–15 | 14 | |
| 8.1 | 141 | 6–15 | 14 | 15 more instructions than PHP 7.4 |
| 7.4 | 126 | 61–93 | 12 |
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Uses · 2
- get_post_types()Gets a list of all registered post type objects.
- str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
Used by · 1
- WP_Query::get_posts()Retrieves an array of posts based on query variables.
Source code
protected function generate_cache_key( array $args, $sql ) { global $wpdb; unset( $args['cache_results'], $args['fields'], $args['lazy_load_term_meta'], $args['update_post_meta_cache'], $args['update_post_term_cache'], $args['update_menu_item_cache'], $args['suppress_filters'] ); if ( empty( $args['post_type'] ) ) { if ( $this->is_attachment ) { $args['post_type'] = 'attachment'; } elseif ( $this->is_page ) { $args['post_type'] = 'page'; } else { $args['post_type'] = 'post'; } } elseif ( 'any' === $args['post_type'] ) { $args['post_type'] = array_values( get_post_types( array( 'exclude_from_search' => false ) ) ); } $args['post_type'] = (array) $args['post_type']; // Sort post types to ensure same cache key generation. sort( $args['post_type'] ); /* * Sort arrays that can be used for ordering prior to cache key generation. * * These arrays are sorted in the query generator for the purposes of the * WHERE clause but the arguments are not modified as they can be used for * the orderby clause. * * Their use in the orderby clause will generate a different SQL query so * they can be sorted for the cache key generation. */ $sortable_arrays_with_int_values = array( 'post__in', 'post_parent__in', ); foreach ( $sortable_arrays_with_int_values as $key ) { if ( isset( $args[ $key ] ) && is_array( $args[ $key ] ) ) { $args[ $key ] = array_unique( array_map( 'absint', $args[ $key ] ) ); sort( $args[ $key ] ); } } // Sort and unique the 'post_name__in' for cache key generation. if ( isset( $args['post_name__in'] ) && is_array( $args['post_name__in'] ) ) { $args['post_name__in'] = array_unique( $args['post_name__in'] ); sort( $args['post_name__in'] ); } if ( isset( $args['post_status'] ) ) { $args['post_status'] = (array) $args['post_status']; // Sort post status to ensure same cache key generation. sort( $args['post_status'] ); } // Add a default orderby value of date to ensure same cache key generation. if ( ! isset( $args['orderby'] ) ) { $args['orderby'] = 'date'; } $placeholder = $wpdb->placeholder_escape(); array_walk_recursive( $args, /* * Replace wpdb placeholders with the string used in the database * query to avoid unreachable cache keys. This is necessary because * the placeholder is randomly generated in each request. * * $value is passed by reference to allow it to be modified. * array_walk_recursive() does not return an array. */ static function ( &$value ) use ( $wpdb, $placeholder ) { if ( is_string( $value ) && str_contains( $value, $placeholder ) ) { $value = $wpdb->remove_placeholder_escape( $value );Changelog
Introduced in 6.1.0. Unchanged from 6.7.7 through 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/class-wp-query.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.