PHP in_array() function in ActionScript for Flex

Another common PHP function is in_array() used to determine if a value exsists in an array. Here is the function recreated in actionscript for flex.

public function in_array( needle:*, haystack:Array ):Boolean
{
   var itemIndex:int = haystack.indexOf( needle );
   return ( itemIndex < 0 ) ? false : true;
}