wp_link_category_checklist( int $link_id = 0 )
- Since
- 2.5.1
- Source
wp-admin/includes/template.php:267
Compatibility
- WordPress
- since 2.5.1
- 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
$link_idintoptional- The link ID. Default 0.Default:
0
Performance profile
How much work a call to wp_link_category_checklist() 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
- Scales with input
- Instructions
- 10–21
- Plugin surface
- 1 hook
- Called by
- 2
Reaches the database via get_terms().
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 58.
Third-party callbacks on 'the_category' run inside this call, and their cost is not bounded by anything here.
2 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- querycontent query
get_terms()called directly - hookthird-party callbacks
apply_filters()called directly
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 wp_link_category_checklist() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 10–13 | get_terms() |
| always | 15–21 | wp_get_link_cats(), get_terms() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 58 | 10–21 | 6 | |
| 8.5 | 58 | 10–21 | 6 | |
| 8.4 | 58 | 10–21 | 6 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 61 | 10–21 | 6 | |
| 8.2 | 61 | 10–21 | 6 | |
| 8.1 | 61 | 10–21 | 6 | |
| 7.4 | 61 | 10–21 | 6 |
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 wp_link_category_checklist() runs, in this order:
- apply_filters( the_category )filterline 298 (+31 into the body)
Filters the category or list of categories.
Uses · 4
- wp_get_link_cats()Retrieves the link category IDs associated with the link specified.
- get_terms()Retrieves the terms in a given taxonomy or list of taxonomies.
- esc_html()Escaping for HTML blocks.
- apply_filters()Calls the callback functions that have been added to a filter hook.
Used by · 2
- dropdown_link_categories()Legacy function used to generate a link categories checklist control.
- link_categories_meta_box()Displays link categories form fields.
Source code
function wp_link_category_checklist( $link_id = 0 ) { $default = 1; $checked_categories = array(); if ( $link_id ) { $checked_categories = wp_get_link_cats( $link_id ); // No selected categories, strange. if ( ! count( $checked_categories ) ) { $checked_categories[] = $default; } } else { $checked_categories[] = $default; } $categories = get_terms( array( 'taxonomy' => 'link_category', 'orderby' => 'name', 'hide_empty' => 0, ) ); if ( empty( $categories ) ) { return; } foreach ( $categories as $category ) { $cat_id = $category->term_id; /** This filter is documented in wp-includes/category-template.php */ $name = esc_html( apply_filters( 'the_category', $category->name, '', '' ) ); $checked = in_array( $cat_id, $checked_categories, true ) ? ' checked="checked"' : ''; echo '<li id="link-category-', $cat_id, '"><label for="in-link-category-', $cat_id, '" class="selectit"><input value="', $cat_id, '" type="checkbox" name="link_category[]" id="in-link-category-', $cat_id, '"', $checked, '/> ', $name, '</label></li>'; }}Changelog
Introduced in 2.5.1. 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 6.9.7 tag, from
src/wp-admin/includes/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.