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<?php $sum = function($a, $b) { return $a + $b; }; function test ($callback) { return call_user_func($callback(2, 13)); }; echo test('sum');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to undefined function sum() in /in/Q2bJe:8 Stack trace: #0 /in/Q2bJe(11): test('sum') #1 {main} thrown in /in/Q2bJe on line 8
Process exited with code 255.

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