wppaste
WordPress

twentytwenty_unique_id( string $prefix = '' ): string

Since
Twenty Twenty 1.0
Source
wp-content/themes/twentytwenty/inc/template-tags.php:855
Gets unique ID.

Description

This is a PHP implementation of Underscore's uniqueId method. A static variable contains an integer that is incremented with each call. This number is returned with the optional prefix. As such the returned value is not universally unique, but it is unique across the life of the PHP process.

Compatibility

WordPress
since Twenty Twenty 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

$prefixstringoptional
Prefix for the returned ID.Default: ''

Return value

string
Unique ID.

Performance profile

How much work a call to twentytwenty_unique_id() 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
9–10

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 13.

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 · 2 distinct outcomes

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

WhenInstructionsCalls it makes
!function_exists()9function_exists()
function_exists()10function_exists(), wp_unique_id()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 13 instructions, 9–10 executed per call, 1 branch. 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.

Uses · 1

Source code

View on Trac View on GitHub 

function twentytwenty_unique_id( $prefix = '' ) {	static $id_counter = 0;	if ( function_exists( 'wp_unique_id' ) ) {		return wp_unique_id( $prefix );	}	return $prefix . (string) ++$id_counter;}

Changelog

Introduced in Twenty Twenty 1.0. 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-content/themes/twentytwenty/inc/template-tags.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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