function array_key_exists ( key, search ) {	// Checks if the given key or index exists in the array
	// 
	// +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

	// input sanitation
	if( !search || (search.constructor !== Array && search.constructor !== Object) ){
		return false;
	}

	return search[key] !== undefined;
}