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<?php eval(' class RefCallBugTester { public $bad = true; function __call( $name, $args ) { $old = error_reporting( E_ALL & ~E_WARNING ); call_user_func_array( array( $this, \'checkForBrokenRef\' ), $args ); error_reporting( $old ); } function checkForBrokenRef( &$var ) { if( $var ) $this->bad = false; } function execute() { $var = true; call_user_func_array( array( $this, \'foo\' ), array( &$var ) ); } } $refCallBugTester = new RefCallBugTester(); $refCallBugTester->execute(); if($refCallBugTester->bad) return $error_message; return null; ');