render_block_core_navigation_submenu( array $attributes, string $content, WP_Block $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

$attributesarray

The block attributes.

$contentstring

The saved content.

$blockWP_Block

The parsed block.

Return value

string

Returns the post content with the legacy widget added.

Performance profile

How much work a call to render_block_core_navigation_submenu() 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

Heavy

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

Scaling

Scales with input

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

Instructions

98–222

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 346.

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

• optionoption read or writeget_option()one call below render_block_core_navigation_submenu()
• hookthird-party callbacksapply_filters()one call below render_block_core_navigation_submenu()

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 · 42 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost render_block_core_navigation_submenu() 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 · 15

• block_core_navigation_submenu_build_css_font_sizes()Build an array with CSS classes and inline styles defining the font sizes which will be applied to the navigation markup in the front-end.
• get_queried_object_id()Retrieves the ID of the currently queried object.
• get_queried_object()Retrieves the currently queried object.
• is_post_type_archive()Determines whether the query is for an existing post type archive page.
• get_post_type_archive_link()Retrieves the permalink for a post type archive.
• block_core_navigation_submenu_get_submenu_visibility()Returns the submenu visibility value with backward compatibility for the deprecated openSubmenusOnClick attribute.
• get_block_wrapper_attributes()Generates a string of attributes by applying to the current block being rendered all of the features that the block supports.
• wp_kses_post()Sanitizes content for allowed HTML tags for post content.
• __()Retrieves the translation of $text.
• wp_strip_all_tags()Properly strips all HTML tags including 'script' and 'style'.
• esc_url()Checks and cleans a URL.
• esc_attr()Escaping for HTML attributes.

Source code

View on Trac ↗View on GitHub ↗

119function render_block_core_navigation_submenu( $attributes, $content, $block ) {120	// Check if this navigation item should render based on post status.121	if ( defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN ) {122		if ( ! gutenberg_block_core_shared_navigation_item_should_render( $attributes, $block ) ) {123			return '';124		}125	}126 127	// Don't render the block's subtree if it has no label.128	if ( empty( $attributes['label'] ) ) {129		return '';130	}131 132	$font_sizes      = block_core_navigation_submenu_build_css_font_sizes( $block->context );133	$style_attribute = $font_sizes['inline_styles'];134 135	// Render inner blocks first to check if any menu items will actually display.136	$inner_blocks_html = '';137	foreach ( $block->inner_blocks as $inner_block ) {138		$inner_blocks_html .= $inner_block->render();139	}140	$has_submenu = ! empty( trim( $inner_blocks_html ) );141 142	$kind      = empty( $attributes['kind'] ) ? 'post_type' : str_replace( '-', '_', $attributes['kind'] );143	$is_active = ! empty( $attributes['id'] ) && get_queried_object_id() === (int) $attributes['id'] && ! empty( get_queried_object()->$kind );144 145	if ( is_post_type_archive() && ! empty( $attributes['url'] ) ) {146		$queried_archive_link = get_post_type_archive_link( get_queried_object()->name );147		if ( $attributes['url'] === $queried_archive_link ) {148			$is_active = true;149		}150	}151 152	$show_submenu_indicators = isset( $block->context['showSubmenuIcon'] ) && $block->context['showSubmenuIcon'];153	$computed_visibility     = block_core_navigation_submenu_get_submenu_visibility( $block->context );154	$open_on_click           = 'click' === $computed_visibility;155	$open_on_hover           = 'hover' === $computed_visibility;156	$open_on_hover_and_click = $open_on_hover && $show_submenu_indicators;157 158	$classes = array(159		'wp-block-navigation-item',160	);161	$classes = array_merge(162		$classes,163		$font_sizes['css_classes']164	);165	if ( $has_submenu ) {166		$classes[] = 'has-child';167	}168	if ( $open_on_click ) {169		$classes[] = 'open-on-click';170	}171	if ( $open_on_hover_and_click ) {172		$classes[] = 'open-on-hover-click';173	}174	if ( 'always' === $computed_visibility ) {175		$classes[] = 'open-always';176	}177	if ( $is_active ) {178		$classes[] = 'current-menu-item';179	}180 181	$wrapper_attributes = get_block_wrapper_attributes(182		array(183			'class' => implode( ' ', $classes ),184			'style' => $style_attribute,185		)186	);187 188	$label = '';189 190	if ( isset( $attributes['label'] ) ) {191		$label .= wp_kses_post( $attributes['label'] );192	}193 194	$aria_label = sprintf(195		/* translators: Accessibility text. %s: Parent page title. */196		__( '%s submenu' ),197		wp_strip_all_tags( $label )198	);

Changelog

Introduced in 5.9.0. 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/blocks/navigation-submenu.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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