WP_Posts_List_Table::categories_dropdown( string $post_type )

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$post_typestring

Post type slug.

Performance profile

How much work a call to WP_Posts_List_Table::categories_dropdown() 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_terms().

Scaling

Constant

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

Instructions

10–38

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 39.

Plugin surface

1 hook

Third-party callbacks on 'disable_categories_dropdown' run inside this call, and their cost is not bounded by anything here.

Called by

1

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

What it touches

• hookthird-party callbacksapply_filters()called directly
• querycontent queryget_terms()one call below WP_Posts_List_Table::categories_dropdown()

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 · 3 distinct outcomes

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

Hooks and filters fired · 1

One hook fires while WP_Posts_List_Table::categories_dropdown() runs, in this order:

1. 1
   apply_filters( disable_categories_dropdown )filterline 475 (+11 into the body)

   Filters whether to remove the 'Categories' drop-down from the post list table.

Uses · 4

• apply_filters()Calls the callback functions that have been added to a filter hook.
• is_object_in_taxonomy()Determines if the given object type is associated with the given taxonomy.
• get_taxonomy()Retrieves the taxonomy object of $taxonomy.
• wp_dropdown_categories()Displays or retrieves the HTML dropdown list of categories.

Used by · 1

• WP_Posts_List_Table::extra_tablenav()

Source code

View on Trac ↗View on GitHub ↗

464	protected function categories_dropdown( $post_type ) {465		global $cat;466 467		/**468		 * Filters whether to remove the 'Categories' drop-down from the post list table.469		 *470		 * @since 4.6.0471		 *472		 * @param bool   $disable   Whether to disable the categories drop-down. Default false.473		 * @param string $post_type Post type slug.474		 */475		if ( false !== apply_filters( 'disable_categories_dropdown', false, $post_type ) ) {476			return;477		}478 479		if ( is_object_in_taxonomy( $post_type, 'category' ) ) {480			$dropdown_options = array(481				'show_option_all' => get_taxonomy( 'category' )->labels->all_items,482				'hide_empty'      => 0,483				'hierarchical'    => 1,484				'show_count'      => 0,485				'orderby'         => 'name',486				'selected'        => $cat,487			);488 489			echo '<label class="screen-reader-text" for="cat">' . get_taxonomy( 'category' )->labels->filter_by_item . '</label>';490 491			wp_dropdown_categories( $dropdown_options );492		}493	}

Changelog

Introduced in 4.6.0. 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 7.1.0 tag, from src/wp-admin/includes/class-wp-posts-list-table.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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