<?php class A { public function y() { $GLOBALS['x'] = null; } public function z() { echo "Hello World\n"; } } function nullthrows($x) { if ($x === null) { throw new Exception('Unexpected null'); } return $x; } function foo($x) { if ($x && $x->y()) { nullthrows($x)->z(); } } $GLOBALS['x'] = new A(); foo(&$GLOBALS['x']);
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