Online PHP editor | refs for ebUAB

<?php function isSetTest($value){ global $$value; if ( !isset($$value)){ $$value = NULL; } return $$value; } //Undefined variable here var_dump('name' . isSetTest("value") . "\n"); //Defined variable here $ImDefined = "YES"; var_dump('name' . isSetTest("ImDefined") . "\n");