has_term( string|int|array $term = '', string $taxonomy = '', int|WP_Post|null $post = null ): bool
- Since
- 3.1.0
- Source
wp-includes/category-template.php:1542
Description
The given terms are checked against the post's terms' term_ids, names and slugs.
Terms given as integers will only be checked against the post's terms' term_ids.
If no terms are given, determines if post has any terms.
Compatibility
- WordPress
- since 3.1.0
- 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
$termstring|int|arrayoptional- The term name/term_id/slug, or an array of them to check for. Default empty.Default:
'' $taxonomystringoptional- Taxonomy name. Default empty.Default:
'' $postint|WP_Post|nulloptional- Post to check. Defaults to the current post.Default:
null
Return value
bool- True if the current post has any of the given terms (or any term, if no term specified). False otherwise.
Performance profile
How much work a call to has_term() 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
- Scaling
- Constant
- Instructions
- 9–21
- Plugin surface
- None
- Called by
- 4
Reaches the database via get_post().
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 23.
Nothing here hands control to plugin code.
4 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- querycontent query
get_post()called directly - cacheobject cache
wp_cache_set()one call below has_term() - hookthird-party callbacks
do_action()one call below has_term()
Further down the call graph this can also reach option, 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 has_term() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 9 | get_post() |
| always | 21 | get_post(), is_object_in_term(), is_wp_error() |
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, 9–21 executed per call, 2 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 · 3
- get_post()Retrieves post data given a post ID or post object.
- is_object_in_term()Determines if the given object is associated with any of the given terms.
- is_wp_error()Checks whether the given variable is a WordPress Error.
Used by · 4
- has_category()Checks if the current post has any of given category.
- has_post_format()Check if a post has any of the given formats, or any format.
- has_tag()Checks if the current post has any of given tags.
- redirect_canonical()Redirects incoming links to the proper URL based on the site url.
Source code
function has_term( $term = '', $taxonomy = '', $post = null ) { $post = get_post( $post ); if ( ! $post ) { return false; } $r = is_object_in_term( $post->ID, $taxonomy, $term ); if ( is_wp_error( $r ) ) { return false; } return $r;}Changelog
Introduced in 3.1.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$post retyped from int|WP_Post to int|WP_Post|null.verified against sourceAbout this page
- Parsed data
- Generated from the wordpress-develop 7.1.0 tag, from
src/wp-includes/category-template.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.