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<?php $in = [0]; $out = array_filter($in, function(&$v) { $v = 1; return 1; }); var_dump($in, $out);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($v) must be passed by reference, value given in /in/8dlfb on line 4 array(1) { [0]=> int(0) } array(1) { [0]=> int(0) }

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