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<?php $arr = array(0,null,3,null); print_r(array_filter($arr), function($var){return !is_null($var);});
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: print_r(): Argument #2 ($return) must be of type bool, Closure given in /in/OtD3v:4 Stack trace: #0 /in/OtD3v(4): print_r(Array, Object(Closure)) #1 {main} thrown in /in/OtD3v on line 4
Process exited with code 255.

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