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<?php $foo = null; $name = 'this'; var_dump(array($$name)); var_dump(array(&$$name));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $this in /in/l5f5U on line 4 array(1) { [0]=> NULL } Fatal error: Uncaught Error: Cannot re-assign $this in /in/l5f5U:5 Stack trace: #0 {main} thrown in /in/l5f5U on line 5
Process exited with code 255.

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