set_screen_options()

Compatibility

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

Performance profile

How much work a call to set_screen_options() 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

Trivial

Touches nothing outside its own arguments.

Scaling

Constant

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

Instructions

4–130

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 145.

Plugin surface

2 hooks

Third-party callbacks on 'set-screen-option', 'set_screen_option_{$option}' run inside this call, and their cost is not bounded by anything here.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

• hookthird-party callbacksapply_filters()called directly

Further down the call graph this can also reach serialize, cache, option, 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 · 21 distinct outcomes

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

Hooks and filters fired · 2

2 hooks fire while set_screen_options() runs, in this order:

1. 1
   apply_filters( set-screen-option )filterline 778 (+79 into the body)

   Filters a screen option value before it is set.

2. 2
   apply_filters( set_screen_option_{$option} )filterline 797 (+98 into the body)

   Filters a screen option value before it is set.

Uses · 12

• check_admin_referer()Ensures intent by verifying that a user was referred from another admin page with the correct security nonce.
• wp_get_current_user()Retrieves the current user object.
• sanitize_key()Sanitizes a string key.
• get_taxonomies()Retrieves a list of registered taxonomy names or objects.
• get_post_types()Gets a list of all registered post type objects.
• str_ends_with()Polyfill for `str_ends_with()` function added in PHP 8.0.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• update_user_meta()Updates user meta field based on user ID.
• remove_query_arg()Removes an item or items from a query string.
• wp_get_referer()Retrieves referer from '_wp_http_referer' or HTTP referer.
• add_query_arg()Retrieves a modified URL query string.
• wp_safe_redirect()Performs a safe (local) redirect, using wp_redirect().

Source code

View on Trac ↗View on GitHub ↗

699function set_screen_options() {700	if ( ! isset( $_POST['wp_screen_options'] ) || ! is_array( $_POST['wp_screen_options'] ) ) {701		return;702	}703 704	check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );705 706	$user = wp_get_current_user();707 708	if ( ! $user ) {709		return;710	}711 712	$option = $_POST['wp_screen_options']['option'];713	$value  = $_POST['wp_screen_options']['value'];714 715	if ( sanitize_key( $option ) !== $option ) {716		return;717	}718 719	$map_option = $option;720	$type       = str_replace( 'edit_', '', $map_option );721	$type       = str_replace( '_per_page', '', $type );722 723	if ( in_array( $type, get_taxonomies(), true ) ) {724		$map_option = 'edit_tags_per_page';725	} elseif ( in_array( $type, get_post_types(), true ) ) {726		$map_option = 'edit_per_page';727	} else {728		$option = str_replace( '-', '_', $option );729	}730 731	switch ( $map_option ) {732		case 'edit_per_page':733		case 'users_per_page':734		case 'edit_comments_per_page':735		case 'upload_per_page':736		case 'edit_tags_per_page':737		case 'plugins_per_page':738		case 'export_personal_data_requests_per_page':739		case 'remove_personal_data_requests_per_page':740			// Network admin.741		case 'sites_network_per_page':742		case 'users_network_per_page':743		case 'site_users_network_per_page':744		case 'plugins_network_per_page':745		case 'themes_network_per_page':746		case 'site_themes_network_per_page':747			$value = (int) $value;748 749			if ( $value < 1 || $value > 999 ) {750				return;751			}752 753			break;754 755		default:756			$screen_option = false;757 758			if ( str_ends_with( $option, '_page' ) || 'layout_columns' === $option ) {759				/**760				 * Filters a screen option value before it is set.761				 *762				 * The filter can also be used to modify non-standard `[items]_per_page`763				 * settings. See the parent function for a full list of standard options.764				 *765				 * Returning false from the filter will skip saving the current option.766				 *767				 * @since 2.8.0768				 * @since 5.4.2 Only applied to options ending with '_page',769				 *              or the 'layout_columns' option.770				 *771				 * @see set_screen_options()772				 *773				 * @param mixed  $screen_option The value to save instead of the option value.774				 *                              Default false (to skip saving the current option).775				 * @param string $option        The option name.776				 * @param int    $value         The option value.777				 */778				$screen_option = apply_filters( 'set-screen-option', $screen_option, $option, $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores

Changelog

Introduced in 2.8.0. 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

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