gistfile1.php

<?php

/**
 * Inject a placeholder in the WP admin menu by bumping everything else down if necessary
 *
 * @param $position int The desired position to free up
 */
function my_free_up_menu_slot( $position ) {
	global $menu;

	if( !is_array( $menu ) ) {
		return $menu;
	}

	// store the menu in reverse so we can iterate through it without losing anything
	$my_menu = array_reverse( $menu, true );
	krsort( $my_menu );

	// if the slot is occupied, free it up!
	if( isset( $menu[$position] ) ) {
		// iterate through the (reversed) menu and increment every key
		foreach( $my_menu as $my_menu_key => $my_menu_value ) {
			$my_menu[$my_menu_key+1] = $my_menu[$my_menu_key];
			unset( $my_menu[$my_menu_key] ); // kill the original
		}
	}

	// back to business
	$menu = array_reverse( $my_menu, true );
}