wppaste
WordPress

wxr_post_taxonomy()

Since
2.3.0
Source
wp-admin/includes/export.php:469
Outputs list of taxonomy terms, in XML tag format, associated with a post.

Compatibility

WordPress
since 2.3.0
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.

Performance profile

How much work a call to wxr_post_taxonomy() 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 get_post().

Scaling
Scales with input

The body loops, so the work grows with how much data it finds.

Instructions
12–23

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 40.

Plugin surface
None

Nothing here hands control to plugin code.

Called by
1

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

What it touches

  • querycontent queryget_post()called directly
  • hookthird-party callbacksapply_filters()one call below wxr_post_taxonomy()

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 · 2 distinct outcomes

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

WhenInstructionsCalls it makes
empty($taxonomies)12get_post(), get_object_taxonomies()
!empty($taxonomies)22–23get_post(), get_object_taxonomies(), wp_get_object_terms()

Across PHP versions

Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 40 instructions, 12–23 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 · 4

  • get_post()Retrieves post data given a post ID or post object.
  • get_object_taxonomies()Returns the names or objects of the taxonomies which are registered for the requested object or object type, such as a post object or post type name.
  • wp_get_object_terms()Retrieves the terms associated with the given object(s), in the supplied taxonomies.
  • wxr_cdata()Wraps given string in XML CDATA tag.

Used by · 1

Source code

View on Trac View on GitHub 

	function wxr_post_taxonomy() {		$post = get_post(); 		$taxonomies = get_object_taxonomies( $post->post_type );		if ( empty( $taxonomies ) ) {			return;		}		$terms = wp_get_object_terms( $post->ID, $taxonomies ); 		foreach ( (array) $terms as $term ) {			echo "\t\t<category domain=\"{$term->taxonomy}\" nicename=\"{$term->slug}\">" . wxr_cdata( $term->name ) . "</category>\n";		}	}

Changelog

Introduced in 2.3.0. 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 7.0.4 tag, from src/wp-admin/includes/export.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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