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_wp_menu_output( array $menu, array $submenu, bool $submenu_as_parent = true )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Display menu.

Description

Parameters

$menu

(array) (Required)

$submenu

(array) (Required)

$submenu_as_parent

(bool) (Optional)

Default value: true

Source

File: wp-admin/menu-header.php

function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
	global $self, $parent_file, $submenu_file, $plugin_page, $typenow;

	$first = true;
	// 0 = menu_title, 1 = capability, 2 = menu_slug, 3 = page_title, 4 = classes, 5 = hookname, 6 = icon_url
	foreach ( $menu as $key => $item ) {
		$admin_is_parent = false;
		$class           = array();
		$aria_attributes = '';
		$aria_hidden     = '';
		$is_separator    = false;

		if ( $first ) {
			$class[] = 'wp-first-item';
			$first   = false;
		}

		$submenu_items = array();
		if ( ! empty( $submenu[ $item[2] ] ) ) {
			$class[]       = 'wp-has-submenu';
			$submenu_items = $submenu[ $item[2] ];
		}

		if ( ( $parent_file && $item[2] == $parent_file ) || ( empty( $typenow ) && $self == $item[2] ) ) {
			if ( ! empty( $submenu_items ) ) {
				$class[] = 'wp-has-current-submenu wp-menu-open';
			} else {
				$class[]          = 'current';
				$aria_attributes .= 'aria-current="page"';
			}
		} else {
			$class[] = 'wp-not-current-submenu';
			if ( ! empty( $submenu_items ) ) {
				$aria_attributes .= 'aria-haspopup="true"';
			}
		}

		if ( ! empty( $item[4] ) ) {
			$class[] = esc_attr( $item[4] );
		}

		$class     = $class ? ' class="' . join( ' ', $class ) . '"' : '';
		$id        = ! empty( $item[5] ) ? ' id="' . preg_replace( '|[^a-zA-Z0-9_:.]|', '-', $item[5] ) . '"' : '';
		$img       = $img_style = '';
		$img_class = ' dashicons-before';

		if ( false !== strpos( $class, 'wp-menu-separator' ) ) {
			$is_separator = true;
		}

		/*
		 * If the string 'none' (previously 'div') is passed instead of a URL, don't output
		 * the default menu image so an icon can be added to div.wp-menu-image as background
		 * with CSS. Dashicons and base64-encoded data:image/svg_xml URIs are also handled
		 * as special cases.
		 */
		if ( ! empty( $item[6] ) ) {
			$img = '<img src="' . $item[6] . '" alt="" />';

			if ( 'none' === $item[6] || 'div' === $item[6] ) {
				$img = '<br />';
			} elseif ( 0 === strpos( $item[6], 'data:image/svg+xml;base64,' ) ) {
				$img       = '<br />';
				$img_style = ' style="background-image:url(\'' . esc_attr( $item[6] ) . '\')"';
				$img_class = ' svg';
			} elseif ( 0 === strpos( $item[6], 'dashicons-' ) ) {
				$img       = '<br />';
				$img_class = ' dashicons-before ' . sanitize_html_class( $item[6] );
			}
		}
		$arrow = '<div class="wp-menu-arrow"><div></div></div>';

		$title = wptexturize( $item[0] );

		// Hide separators from screen readers.
		if ( $is_separator ) {
			$aria_hidden = ' aria-hidden="true"';
		}

		echo "\n\t<li$class$id$aria_hidden>";

		if ( $is_separator ) {
			echo '<div class="separator"></div>';
		} elseif ( $submenu_as_parent && ! empty( $submenu_items ) ) {
			$submenu_items = array_values( $submenu_items );  // Re-index.
			$menu_hook     = get_plugin_page_hook( $submenu_items[0][2], $item[2] );
			$menu_file     = $submenu_items[0][2];
			if ( false !== ( $pos = strpos( $menu_file, '?' ) ) ) {
				$menu_file = substr( $menu_file, 0, $pos );
			}
			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $submenu_items[0][2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
				$admin_is_parent = true;
				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
			} else {
				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>$title</div></a>";
			}
		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
			$menu_file = $item[2];
			if ( false !== ( $pos = strpos( $menu_file, '?' ) ) ) {
				$menu_file = substr( $menu_file, 0, $pos );
			}
			if ( ! empty( $menu_hook ) || ( ( 'index.php' != $item[2] ) && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) ) ) {
				$admin_is_parent = true;
				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
			} else {
				echo "\n\t<a href='{$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
			}
		}

		if ( ! empty( $submenu_items ) ) {
			echo "\n\t<ul class='wp-submenu wp-submenu-wrap'>";
			echo "<li class='wp-submenu-head' aria-hidden='true'>{$item[0]}</li>";

			$first = true;

			// 0 = menu_title, 1 = capability, 2 = menu_slug, 3 = page_title, 4 = classes
			foreach ( $submenu_items as $sub_key => $sub_item ) {
				if ( ! current_user_can( $sub_item[1] ) ) {
					continue;
				}

				$class           = array();
				$aria_attributes = '';
				if ( $first ) {
					$class[] = 'wp-first-item';
					$first   = false;
				}

				$menu_file = $item[2];

				if ( false !== ( $pos = strpos( $menu_file, '?' ) ) ) {
					$menu_file = substr( $menu_file, 0, $pos );
				}

				// Handle current for post_type=post|page|foo pages, which won't match $self.
				$self_type = ! empty( $typenow ) ? $self . '?post_type=' . $typenow : 'nothing';

				if ( isset( $submenu_file ) ) {
					if ( $submenu_file == $sub_item[2] ) {
						$class[]          = 'current';
						$aria_attributes .= ' aria-current="page"';
					}
					// If plugin_page is set the parent must either match the current page or not physically exist.
					// This allows plugin pages with the same hook to exist under different parents.
				} elseif (
					( ! isset( $plugin_page ) && $self == $sub_item[2] ) ||
					( isset( $plugin_page ) && $plugin_page == $sub_item[2] && ( $item[2] == $self_type || $item[2] == $self || file_exists( $menu_file ) === false ) )
				) {
					$class[]          = 'current';
					$aria_attributes .= ' aria-current="page"';
				}

				if ( ! empty( $sub_item[4] ) ) {
					$class[] = esc_attr( $sub_item[4] );
				}

				$class = $class ? ' class="' . join( ' ', $class ) . '"' : '';

				$menu_hook = get_plugin_page_hook( $sub_item[2], $item[2] );
				$sub_file  = $sub_item[2];
				if ( false !== ( $pos = strpos( $sub_file, '?' ) ) ) {
					$sub_file = substr( $sub_file, 0, $pos );
				}

				$title = wptexturize( $sub_item[0] );

				if ( ! empty( $menu_hook ) || ( ( 'index.php' != $sub_item[2] ) && file_exists( WP_PLUGIN_DIR . "/$sub_file" ) && ! file_exists( ABSPATH . "/wp-admin/$sub_file" ) ) ) {
					// If admin.php is the current page or if the parent exists as a file in the plugins or admin dir
					if ( ( ! $admin_is_parent && file_exists( WP_PLUGIN_DIR . "/$menu_file" ) && ! is_dir( WP_PLUGIN_DIR . "/{$item[2]}" ) ) || file_exists( $menu_file ) ) {
						$sub_item_url = add_query_arg( array( 'page' => $sub_item[2] ), $item[2] );
					} else {
						$sub_item_url = add_query_arg( array( 'page' => $sub_item[2] ), 'admin.php' );
					}

					$sub_item_url = esc_url( $sub_item_url );
					echo "<li$class><a href='$sub_item_url'$class$aria_attributes>$title</a></li>";
				} else {
					echo "<li$class><a href='{$sub_item[2]}'$class$aria_attributes>$title</a></li>";
				}
			}
			echo '</ul>';
		}
		echo '</li>';
	}

	echo '<li id="collapse-menu" class="hide-if-no-js">' .
		'<button type="button" id="collapse-button" aria-label="' . esc_attr__( 'Collapse Main menu' ) . '" aria-expanded="true">' .
		'<span class="collapse-button-icon" aria-hidden="true"></span>' .
		'<span class="collapse-button-label">' . __( 'Collapse menu' ) . '</span>' .
		'</button></li>';
}

Changelog

Version Description
2.7.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_wp_menu_output