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WordPress

WP_Theme::_name_sort( WP_Theme $a, WP_Theme $b ): int

Since
3.4.0
Source
wp-includes/class-wp-theme.php:2158
Callback function for usort() to naturally sort themes by name.

Description

Accesses the Name header directly from the class for maximum speed.
Would choke on HTML but we don't care enough to slow it down with strip_tags().

Compatibility

WordPress
since 3.4.0
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

$aWP_Theme
First theme.
$bWP_Theme
Second theme.

Return value

int
Negative if $a falls lower in the natural order than $b. Zero if they fall equally.
Greater than 0 if $a falls higher in the natural order than $b. Used with usort().

Performance profile

How much work a call to WP_Theme::_name_sort() 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

Touches nothing outside its own arguments.

Scaling
Constant

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

Instructions
11

Executed per call on PHP 8.5. The body compiles to 11.

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 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_Theme::_name_sort() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always11strnatcasecmp()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 11 instructions, 11 executed per call, 0 branches. The work does not change between versions.

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.

Source code

View on Trac View on GitHub 

	private static function _name_sort( $a, $b ) {		return strnatcasecmp( $a->headers['Name'], $b->headers['Name'] );	}

Changelog

Introduced in 3.4.0. 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/class-wp-theme.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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