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<?php $a = ['','',5,0,'hey']; print_r( array_filter($a), function($i) { return $i != ''; } );
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: print_r(): Argument #2 ($return) must be of type bool, Closure given in /in/LSVVO:5 Stack trace: #0 /in/LSVVO(5): print_r(Array, Object(Closure)) #1 {main} thrown in /in/LSVVO on line 5
Process exited with code 255.

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