block_core_archives_build_dropdown_script( string $dropdown_id ): string

Compatibility

Present in 3 of the 5 tracked releases, added in 6.9.0, and compiles on PHP 7.4 through 8.6-dev.

Parameters

$dropdown_idstring

ID of the dropdown field.

Return value

string

Returns the dropdown onChange redirection script.

Performance profile

How much work a call to block_core_archives_build_dropdown_script() 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

26

Executed per call on PHP 8.5. The body compiles to 26.

Plugin surface

None

Nothing here hands control to plugin code.

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()one call below block_core_archives_build_dropdown_script()

Further down the call graph this can also reach option, cache, serialize, 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 · 1 distinct outcome

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

Uses · 3

• home_url()Retrieves the URL for the current site where the front end is accessible.
• wp_json_encode()Encodes a variable into JSON, with some confidence checks.
• wp_get_inline_script_tag()Constructs an inline script tag.

Used by · 1

• render_block_core_archives()Renders the `core/archives` block on server.

Source code

View on Trac ↗View on GitHub ↗

121function block_core_archives_build_dropdown_script( $dropdown_id ) {122	ob_start();123 124	$exports = array( $dropdown_id, home_url() );125	?>126	<script>127	( ( [ dropdownId, homeUrl ] ) => {128		const dropdown = document.getElementById( dropdownId );129		function onSelectChange() {130			setTimeout( () => {131				if ( 'escape' === dropdown.dataset.lastkey ) {132					return;133				}134				if ( dropdown.value ) {135					location.href = dropdown.value;136				}137			}, 250 );138		}139		function onKeyUp( event ) {140			if ( 'Escape' === event.key ) {141				dropdown.dataset.lastkey = 'escape';142			} else {143				delete dropdown.dataset.lastkey;144			}145		}146		function onClick() {147			delete dropdown.dataset.lastkey;148		}149		dropdown.addEventListener( 'keyup', onKeyUp );150		dropdown.addEventListener( 'click', onClick );151		dropdown.addEventListener( 'change', onSelectChange );152	} )( <?php echo wp_json_encode( $exports, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ); ?> );153	</script>154	<?php155	return wp_get_inline_script_tag(156		trim( str_replace( array( '<script>', '</script>' ), '', ob_get_clean() ) ) .157		"\n//# sourceURL=" . rawurlencode( __FUNCTION__ )158	);159}

Changelog

Introduced in 6.9.0. Unchanged from 6.9.7 through 7.1.0.

1. 6.9.7
2. 7.0.4
3. 7.1.0

Signature, return type and hooks compared across 3 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/blocks/archives.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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