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WordPress

wp_get_post_cats( int $blogid = '1', int $post_id = 0 ): array

Since
1.0.1
Source
wp-includes/deprecated.php:749
Retrieves a list of post categories.

Compatibility

Deprecated in WordPress 2.1.0. Use wp_get_post_categories()

WordPress
since 1.0.1
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

$blogidintoptional
Not UsedDefault: '1'
$post_idintoptional
Default: 0

Return value

array

Performance profile

How much work a call to wp_get_post_cats() 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
Heavy

Reaches the database via wp_get_object_terms().

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 it touches

  • hookthird-party callbacksdo_action()one call below wp_get_post_cats()
  • querycontent querywp_get_object_terms()one call below wp_get_post_cats()

Further down the call graph this can also reach option, cache, serialize 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_get_post_cats() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
always11_deprecated_function(), wp_get_post_categories()

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.

Uses · 2

Source code

View on Trac View on GitHub 

function wp_get_post_cats($blogid = '1', $post_id = 0) {	_deprecated_function( __FUNCTION__, '2.1.0', 'wp_get_post_categories()' );	return wp_get_post_categories($post_id);}

Changelog

Introduced in 1.0.1. 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.

2.1.0
Deprecated. Use wp_get_post_categories()from the docblock
1.0.1
Introduced.from the docblock

About this page

Parsed data
Generated from the wordpress-develop 6.9.7 tag, from src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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