sort_menu( array $a, array $b ): int

Source

function sort_menu( $a, $b ) {
	global $menu_order, $default_menu_order;

	$a = $a[2];
	$b = $b[2];

	if ( isset( $menu_order[ $a ] ) && ! isset( $menu_order[ $b ] ) ) {
		return -1;
	} elseif ( ! isset( $menu_order[ $a ] ) && isset( $menu_order[ $b ] ) ) {
		return 1;
	} elseif ( isset( $menu_order[ $a ] ) && isset( $menu_order[ $b ] ) ) {
		if ( $menu_order[ $a ] === $menu_order[ $b ] ) {
			return 0;
		}
		return ( $menu_order[ $a ] < $menu_order[ $b ] ) ? -1 : 1;
	} else {
		return ( $default_menu_order[ $a ] <= $default_menu_order[ $b ] ) ? -1 : 1;
	}
}

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