wppaste
WordPress

wp_term_is_shared( int $term_id ): bool

Since
4.4.0
Source
wp-includes/taxonomy.php:4621
Determines whether a term is shared between multiple taxonomies.

Description

Shared taxonomy terms began to be split in 4.3, but failed cron tasks or other delays in upgrade routines may cause shared terms to remain.

Compatibility

WordPress
since 4.4.0
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

$term_idint
Term ID.

Return value

bool
Returns false if a term is not shared between multiple taxonomies or if splitting shared taxonomy terms is finished.

Performance profile

How much work a call to wp_term_is_shared() 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_var().

Scaling
Constant

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

Instructions
7–20

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

  • optionoption read or writeget_option()called directly
  • sqldatabase query->get_var()called directly
  • hookthird-party callbacksapply_filters()one call below wp_term_is_shared()
  • cacheobject cachewp_cache_get()one call below wp_term_is_shared()
  • serializeserialisationmaybe_unserialize()one call below wp_term_is_shared()

Further down the call graph this can also reach query 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 wp_term_is_shared() can have, taken from its control-flow graph on PHP 8.5.

WhenInstructionsCalls it makes
get_option()7get_option()
!get_option()20get_option(), ->prepare(), ->get_var()

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, 7–20 executed per call, 1 branch. 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

  • get_option()Retrieves an option value based on an option name.

Used by · 2

Source code

View on Trac View on GitHub 

function wp_term_is_shared( $term_id ) {	global $wpdb; 	if ( get_option( 'finished_splitting_shared_terms' ) ) {		return false;	} 	$tt_count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(*) FROM $wpdb->term_taxonomy WHERE term_id = %d", $term_id ) ); 	return $tt_count > 1;}

Changelog

Introduced in 4.4.0. 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 6.8.8 tag, from src/wp-includes/taxonomy.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.
Corrections
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