wp_render_layout_support_flag( string $block_content, array $block ): string

Compatibility

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

Parameters

$block_contentstring

Rendered block content.

$blockarray

Block object.

Return value

string

Filtered block content.

Performance profile

How much work a call to wp_render_layout_support_flag() 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

Only touches the object cache, via wp_cache_get().

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

114–222

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 515.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

0

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

What it touches

• cacheobject cachewp_cache_get()one call below wp_render_layout_support_flag()
• hookthird-party callbacksapply_filters()one call below wp_render_layout_support_flag()

Further down the call graph this can also reach option, 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 · 24 distinct outcomes

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

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Uses · 16

• block_has_support()Checks whether the current block type supports the feature requested.
• wp_unique_id_from_values()Generates a unique ID based on the structure and values of a given array.
• wp_style_engine_get_stylesheet_from_css_rules()Returns compiled CSS from a collection of selectors and declarations.
• wp_get_global_settings()Gets the settings resulting of merging core, theme, and user data.
• wp_get_layout_definitions()Returns layout definitions, keyed by layout type.
• sanitize_title()Sanitizes a string into a slug, which can be used in URLs or HTML attributes.
• current_theme_supports()Checks a theme's support for a given feature.
• wp_should_skip_block_supports_serialization()Checks whether serialization of the current block's supported properties should occur.
• wp_get_global_styles()Gets the styles resulting of merging core, theme, and user data.
• str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
• wp_get_block_style_variation_name_from_registered_style()Gets the first style variation name from a className string that matches a registered style.
• wp_get_layout_style()Generates the CSS corresponding to the provided layout.

Source code

View on Trac ↗View on GitHub ↗

648function wp_render_layout_support_flag( $block_content, $block ) {649	static $global_styles = null;650 651	$block_type            = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );652	$block_supports_layout = block_has_support( $block_type, 'layout', false ) || block_has_support( $block_type, '__experimentalLayout', false );653	$child_layout          = $block['attrs']['style']['layout'] ?? null;654 655	if ( ! $block_supports_layout && ! $child_layout ) {656		return $block_content;657	}658 659	$outer_class_names = array();660 661	// Child layout specific logic.662	if ( $child_layout ) {663		/*664		 * Generates a unique class for child block layout styles.665		 *666		 * To ensure consistent class generation across different page renders,667		 * only properties that affect layout styling are used. These properties668		 * come from `$block['attrs']['style']['layout']` and `$block['parentLayout']`.669		 *670		 * As long as these properties coincide, the generated class will be the same.671		 */672		$container_content_class = wp_unique_id_from_values(673			array(674				'layout'       => array_intersect_key(675					$block['attrs']['style']['layout'] ?? array(),676					array_flip(677						array( 'selfStretch', 'flexSize', 'columnStart', 'columnSpan', 'rowStart', 'rowSpan' )678					)679				),680				'parentLayout' => array_intersect_key(681					$block['parentLayout'] ?? array(),682					array_flip(683						array( 'minimumColumnWidth', 'columnCount' )684					)685				),686			),687			'wp-container-content-'688		);689 690		$child_layout_declarations = array();691		$child_layout_styles       = array();692 693		$self_stretch = $child_layout['selfStretch'] ?? null;694 695		if ( 'fixed' === $self_stretch && isset( $child_layout['flexSize'] ) ) {696			$child_layout_declarations['flex-basis'] = $child_layout['flexSize'];697			$child_layout_declarations['box-sizing'] = 'border-box';698		} elseif ( 'fill' === $self_stretch ) {699			$child_layout_declarations['flex-grow'] = '1';700		}701 702		if ( isset( $child_layout['columnSpan'] ) ) {703			$column_span                              = $child_layout['columnSpan'];704			$child_layout_declarations['grid-column'] = "span $column_span";705		}706		if ( isset( $child_layout['rowSpan'] ) ) {707			$row_span                              = $child_layout['rowSpan'];708			$child_layout_declarations['grid-row'] = "span $row_span";709		}710		$child_layout_styles[] = array(711			'selector'     => ".$container_content_class",712			'declarations' => $child_layout_declarations,713		);714 715		/*716		 * If columnSpan is set, and the parent grid is responsive, i.e. if it has a minimumColumnWidth set,717		 * the columnSpan should be removed on small grids. If there's a minimumColumnWidth, the grid is responsive.718		 * But if the minimumColumnWidth value wasn't changed, it won't be set. In that case, if columnCount doesn't719		 * exist, we can assume that the grid is responsive.720		 */721		if ( isset( $child_layout['columnSpan'] ) && ( isset( $block['parentLayout']['minimumColumnWidth'] ) || ! isset( $block['parentLayout']['columnCount'] ) ) ) {722			$column_span_number  = floatval( $child_layout['columnSpan'] );723			$parent_column_width = $block['parentLayout']['minimumColumnWidth'] ?? '12rem';724			$parent_column_value = floatval( $parent_column_width );725			$parent_column_unit  = explode( $parent_column_value, $parent_column_width );726 727			/*

Changelog

Introduced in 5.8.0. Unchanged from 6.7.10 through 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 7.0.7 tag, from src/wp-includes/block-supports/layout.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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