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block_core_latest_posts_migrate_categories( array $block ): array

Since
5.5.0
Source
wp-includes/blocks/latest-posts.php:303
Handles outdated versions of the core/latest-posts block by converting attribute categories from a numeric string to an array with key id.

Description

This is done to accommodate the changes introduced in #20781 that sought to add support for multiple categories to the block. However, given that this block is dynamic, the usual provisions for block migration are insufficient, as they only act when a block is loaded in the editor.

TODO: Remove when and if the bottom client-side deprecation for this block is removed.

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

$blockarray
A single parsed block object.

Return value

array
The migrated block object.

Performance profile

How much work a call to block_core_latest_posts_migrate_categories() 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
5–23

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 23.

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

WhenInstructionsCalls it makes
always5–12none
!empty($value)23absint()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 23 instructions, 5–23 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

  • absint()Converts a value to non-negative integer.

Source code

View on Trac View on GitHub 

function block_core_latest_posts_migrate_categories( $block ) {	if (		'core/latest-posts' === $block['blockName'] &&		! empty( $block['attrs']['categories'] ) &&		is_string( $block['attrs']['categories'] )	) {		$block['attrs']['categories'] = array(			array( 'id' => absint( $block['attrs']['categories'] ) ),		);	} 	return $block;}

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 7.1.0 tag, from src/wp-includes/blocks/latest-posts.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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