get_the_tags( int|WP_Post $post = 0 ): WP_Term[]|false|WP_Error
- Since
- 2.3.0
- Source
wp-includes/category-template.php:1177
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.
Parameters
$postint|WP_Postoptional- Post ID or object.Default:
0
Return value
WP_Term[]|false|WP_Error- Array of WP_Term objects on success, false if there are no terms or the post does not exist, WP_Error on failure.
Performance profile
How much work a call to get_the_tags() 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
- 11
- Plugin surface
- 1 hook
- Called by
- 1
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. The body compiles to 11.
Third-party callbacks on 'get_the_tags' run inside this call, and their cost is not bounded by anything here.
1 place in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()called directly - querycontent query
get_post()one call below get_the_tags() - cacheobject cache
wp_cache_add()one call below get_the_tags()
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 · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost get_the_tags() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 11 | get_the_terms(), apply_filters() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 11 instructions, 11 executed per call, 0 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.
Hooks and filters fired · 1
One hook fires while get_the_tags() runs, in this order:
- apply_filters( get_the_tags )filterline 1190 (+13 into the body)
Filters the array of tags for the given post.
Uses · 2
- get_the_terms()Retrieves the terms of the taxonomy that are attached to the post.
- apply_filters()Calls the callback functions that have been added to a filter hook.
Used by · 1
- get_the_category_rss()Retrieves all of the post categories, formatted for use in feeds.
Source code
function get_the_tags( $post = 0 ) { $terms = get_the_terms( $post, 'post_tag' ); /** * Filters the array of tags for the given post. * * @since 2.3.0 * * @see get_the_terms() * * @param WP_Term[]|false|WP_Error $terms Array of WP_Term objects on success, false if there are no terms * or the post does not exist, WP_Error on failure. */ return apply_filters( 'get_the_tags', $terms );}Changelog
Introduced in 2.3.0. Unchanged from 6.7.7 through 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/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.