wppaste
WordPress

WP_Post::__isset( string $key ): bool

Since
3.5.0
Source
wp-includes/class-wp-post.php:279
Isset-er.

Compatibility

WordPress
since 3.5.0
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

$keystring
Property to check if set.

Return value

bool

Performance profile

How much work a call to WP_Post::__isset() 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

Only touches the object cache, via wp_cache_get().

Scaling
Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions
4–17

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

  • hookthird-party callbacksapply_filters()one call below WP_Post::__isset()
  • cacheobject cachewp_cache_get()one call below WP_Post::__isset()

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

WhenInstructionsCalls it makes
always4–10none
$key !== "ancestors" && $key !== "page_template" && $key !== "post_category" && $key !== "tags_input"17metadata_exists()

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, 4–17 executed per call, 4 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

  • metadata_exists()Determines if a meta field with the given key exists for the given object ID.

Used by · 2

Source code

View on Trac View on GitHub 

	public function __isset( $key ) {		if ( 'ancestors' === $key ) {			return true;		} 		if ( 'page_template' === $key ) {			return true;		} 		if ( 'post_category' === $key ) {			return true;		} 		if ( 'tags_input' === $key ) {			return true;		} 		return metadata_exists( 'post', $this->ID, $key );	}

Changelog

Introduced in 3.5.0. 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 6.7.7 tag, from src/wp-includes/class-wp-post.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
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