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add_menu_classes( array $menu )

Parameters

$menu

(array) (Required)

Return

(array)

Source

File: wp-admin/includes/menu.php 

function add_menu_classes( $menu ) {
	$first     = false;
	$lastorder = false;
	$i         = 0;
	$mc        = count( $menu );
	foreach ( $menu as $order => $top ) {
		$i++;

		if ( 0 == $order ) { // Dashboard is always shown/single.
			$menu[0][4] = add_cssclass( 'menu-top-first', $top[4] );
			$lastorder  = 0;
			continue;
		}

		if ( 0 === strpos( $top[2], 'separator' ) && false !== $lastorder ) { // If separator.
			$first                 = true;
			$c                     = $menu[ $lastorder ][4];
			$menu[ $lastorder ][4] = add_cssclass( 'menu-top-last', $c );
			continue;
		}

		if ( $first ) {
			$c                 = $menu[ $order ][4];
			$menu[ $order ][4] = add_cssclass( 'menu-top-first', $c );
			$first             = false;
		}

		if ( $mc == $i ) { // Last item.
			$c                 = $menu[ $order ][4];
			$menu[ $order ][4] = add_cssclass( 'menu-top-last', $c );
		}

		$lastorder = $order;
	}

	/**
	 * Filters administration menus array with classes added for top-level items.
	 *
	 * @since 2.7.0
	 *
	 * @param array $menu Associative array of administration menu items.
	 */
	return apply_filters( 'add_menu_classes', $menu );
}

Uses

Uses Description
wp-admin/includes/menu.php: add_cssclass()
wp-admin/includes/menu.php: add_menu_classes

Filters administration menus array with classes added for top-level items.
wp-includes/plugin.php: apply_filters()

Calls the callback functions that have been added to a filter hook.

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