wp_maybe_add_fetchpriority_high_attr( array $loading_attrs, string $tag_name, array $attr ): array

Compatibility

Present in every tracked release (6.7.10 to 7.1.3), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$loading_attrsarray

Array of the loading optimization attributes for the element.

$tag_namestring

The tag name.

$attrarray

Array of the attributes for the element.

Return value

array

Updated loading optimization attributes for the element.

Performance profile

How much work a call to wp_maybe_add_fetchpriority_high_attr() 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

6–31

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 43.

Plugin surface

1 hook

Third-party callbacks on 'wp_min_priority_img_pixels' 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

What one call costs · 4 distinct outcomes

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

Hooks and filters fired · 1

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

1. 1
   apply_filters( wp_min_priority_img_pixels )filterline 6284 (+37 into the body)

   Filters the minimum square-pixels threshold for an image to be eligible as the high-priority image.

Uses · 2

• wp_high_priority_element_flag()Accesses a flag that indicates if an element is a possible candidate for `fetchpriority='high'`.
• apply_filters()Calls the callback functions that have been added to a filter hook.

Used by · 1

• wp_get_loading_optimization_attributes()Gets loading optimization attributes.

Source code

View on Trac ↗View on GitHub ↗

6247function wp_maybe_add_fetchpriority_high_attr( $loading_attrs, $tag_name, $attr ) {6248	// For now, adding `fetchpriority="high"` is only supported for images.6249	if ( 'img' !== $tag_name ) {6250		return $loading_attrs;6251	}6252 6253	if ( isset( $attr['fetchpriority'] ) ) {6254		/*6255		 * While any `fetchpriority` value could be set in `$loading_attrs`,6256		 * for consistency we only do it for `fetchpriority="high"` since that6257		 * is the only possible value that WordPress core would apply on its6258		 * own.6259		 */6260		if ( 'high' === $attr['fetchpriority'] ) {6261			$loading_attrs['fetchpriority'] = 'high';6262			wp_high_priority_element_flag( false );6263		}6264 6265		return $loading_attrs;6266	}6267 6268	// Lazy-loading and `fetchpriority="high"` are mutually exclusive.6269	if ( isset( $loading_attrs['loading'] ) && 'lazy' === $loading_attrs['loading'] ) {6270		return $loading_attrs;6271	}6272 6273	if ( ! wp_high_priority_element_flag() ) {6274		return $loading_attrs;6275	}6276 6277	/**6278	 * Filters the minimum square-pixels threshold for an image to be eligible as the high-priority image.6279	 *6280	 * @since 6.3.06281	 *6282	 * @param int $threshold Minimum square-pixels threshold. Default 50000.6283	 */6284	$wp_min_priority_img_pixels = apply_filters( 'wp_min_priority_img_pixels', 50000 );6285 6286	if ( $wp_min_priority_img_pixels <= $attr['width'] * $attr['height'] ) {6287		$loading_attrs['fetchpriority'] = 'high';6288		wp_high_priority_element_flag( false );6289	}6290 6291	return $loading_attrs;6292}

Changelog

Introduced in 6.3.0. 3 changes between 6.7.10 and 7.1.3.

1. 6.7.10
2. 6.8.11
3. 6.9.10
4. 7.0.7
5. 7.1.3

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 6.8.11 tag, from src/wp-includes/media.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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