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rest_validate_array_contains_unique_items( array $input_array ): bool

Since
5.5.0
Source
wp-includes/rest-api.php:1755
Checks if an array is made up of unique items.

Compatibility

WordPress
since 5.5.0
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

$input_arrayarray
The array to check.

Return value

bool
True if the array contains unique items, false otherwise.

Performance profile

How much work a call to rest_validate_array_contains_unique_items() 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
Light

Touches nothing outside its own arguments.

Scaling
Scales with input

The body loops, so the work grows with what you pass in.

Instructions
5–16

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 21.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
2

2 places in core call this, so the cost is paid more often than your own code shows.

What it touches

  • serializeserialisationserialize()called directly

Further down the call graph this can also reach hook, query, option, cache 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 · 2 distinct outcomes

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

WhenInstructionsCalls it makes
always5–6none
!$input_array && isset($seen[$key])16rest_stabilize_value(), serialize()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 21 instructions, 5–16 executed per call, 3 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.

Uses · 1

Used by · 2

Source code

View on Trac View on GitHub 

function rest_validate_array_contains_unique_items( $input_array ) {	$seen = array(); 	foreach ( $input_array as $item ) {		$stabilized = rest_stabilize_value( $item );		$key        = serialize( $stabilized ); 		if ( ! isset( $seen[ $key ] ) ) {			$seen[ $key ] = true; 			continue;		} 		return false;	} 	return true;}

Changelog

Introduced in 5.5.0. 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 6.9.7 tag, from src/wp-includes/rest-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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