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get_registered_meta_keys( string $object_type, string $object_subtype = '' ): array[]

Since
4.6.0, 4.9.8
Source
wp-includes/meta.php:1712
Retrieves a list of registered metadata args for an object type, keyed by their meta keys.

Compatibility

WordPress
since 4.9.8
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

$object_typestring
Type of object metadata is for. Accepts 'blog', 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
$object_subtypestringoptional
The subtype of the object type. Default empty string.Default: ''

Return value

array[]
List of registered metadata args, keyed by their meta keys.

Performance profile

How much work a call to get_registered_meta_keys() 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
6–13

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 14.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
5

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

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

WhenInstructionsCalls it makes
always6–13none

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 14 instructions, 6–13 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.

Used by · 5

Source code

View on Trac View on GitHub 

function get_registered_meta_keys( $object_type, $object_subtype = '' ) {	global $wp_meta_keys; 	if ( ! is_array( $wp_meta_keys ) || ! isset( $wp_meta_keys[ $object_type ] ) || ! isset( $wp_meta_keys[ $object_type ][ $object_subtype ] ) ) {		return array();	} 	return $wp_meta_keys[ $object_type ][ $object_subtype ];}

Changelog

Introduced in 4.6.0. 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.

4.9.8
The $object_subtype parameter was added.from the docblock
4.6.0
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/meta.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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