Online PHP editor | output for EWJs2

<?php trait Singleton { # Holds Parent Instance private static $_instance; # Holds Current zval private $_arg; # No Direct Need For This Other Than Stopping Call To new Class private function __construct() {} # Singleton Design public static function getInstance() { return self::$_instance ?? (self::$_instance = new self()); } # Store a reference of the variable to share the zval # Needed to re-pass the variable by reference to share the zval to _arg public function bindArg(&$arg) { $this->_arg =& $arg; } # Output the value of the stored reference if exists public function helloWorld() { echo $this->_arg ?? 'Did not exist.'; } } final class Test { use \Singleton { helloWorld as public peekabo; } } Test::getInstance()->bindArg($row); foreach(['Hello', ',', ' World'] as $row) Test::getInstance()->peekabo();