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WordPress

WP_Object_Cache::stats()

Since
2.0.0
Source
wp-includes/class-wp-object-cache.php:633
Echoes the stats of the caching.

Description

Gives the cache hits, and cache misses. Also prints every cached group, key and the data.

Cost profile

Measured from the compiled opcodes, not from a stopwatch. Every number here is identical on any machine that runs the same PHP version, and every function in core is ranked by these figures.

Cost class
Light

Touches nothing outside its own arguments.

Scaling
Scales with input

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

Instructions
17–18

Executed per call on PHP 8.4, depending on the branch taken. The body compiles to 38.

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

  • hookthird-party callbacksapply_filters()one call below WP_Object_Cache::stats()

Further down the call graph this can also reach option, cache, serialize, query 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 · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Object_Cache::stats() can have, taken from its control-flow graph on PHP 8.4.

WhenInstructionsCalls it makes
always17–18none

Across PHP versions

PHPCompiledExecutedBranchesNotes
7.43817–182Compiles to the same instructions
8.13817–182Compiles to the same instructions
8.23817–182Compiles to the same instructions
8.33817–182Compiles to the same instructions
8.43817–182Compiles to the same instructions

Oldest PHP that compiles this body: 7.4. An instruction is not a fixed amount of time, so a version with the same count is not necessarily the same speed; what the count rules out is a difference in the work itself.

Uses · 1

Source

View on Trac View on GitHub 

	public function stats() {		echo '<p>';		echo "<strong>Cache Hits:</strong> {$this->cache_hits}<br />";		echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br />";		echo '</p>';		echo '<ul>';		foreach ( $this->cache as $group => $cache ) {			echo '<li><strong>Group:</strong> ' . esc_html( $group ) . ' - ( ' . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';		}		echo '</ul>';	}

History

Introduced in 2.0.0. 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 6.8.8 tag, from src/wp-includes/class-wp-object-cache.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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