print_late_styles(): string[]|null

Compatibility

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

Return value

string[]|null

Performance profile

How much work a call to print_late_styles() 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

Moderate

Reads stored settings via get_site_option(), cached per request but not free on a cold cache.

Scaling

Constant

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

Instructions

5–21

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 22.

Plugin surface

1 hook

Third-party callbacks on 'print_late_styles' 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
• optionnetwork optionget_site_option()one call below print_late_styles()

Further down the call graph this can also reach 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 · 3 distinct outcomes

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

Hooks and filters fired · 1

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

1. 1
   apply_filters( print_late_styles )filterline 2404 (+18 into the body)

   Filters whether to print the styles queued too late for the HTML head.

Uses · 3

• script_concat_settings()Determines the concatenation and compression settings for scripts and styles.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• _print_styles()Prints styles (internal use only).

Used by · 1

• _wp_footer_scripts()Private, for use in *_footer_scripts hooks

Source code

View on Trac ↗View on GitHub ↗

2386function print_late_styles() {2387	global $wp_styles, $concatenate_scripts;2388 2389	if ( ! ( $wp_styles instanceof WP_Styles ) ) {2390		return null;2391	}2392 2393	script_concat_settings();2394	$wp_styles->do_concat = $concatenate_scripts;2395	$wp_styles->do_footer_items();2396 2397	/**2398	 * Filters whether to print the styles queued too late for the HTML head.2399	 *2400	 * @since 3.3.02401	 *2402	 * @param bool $print Whether to print the 'late' styles. Default true.2403	 */2404	if ( apply_filters( 'print_late_styles', true ) ) {2405		_print_styles();2406	}2407 2408	$wp_styles->reset();2409	return $wp_styles->done;2410}

Changelog

Introduced in 3.3.0. 2 changes between 6.7.7 and 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-includes/script-loader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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