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<?php $data = ['foo', 'bar']; var_dump($data); $filtered = array_filter($data, function (&$value) { $value = (bool) $value; return true; }); var_dump($filtered);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" } Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 Warning: {closure}(): Argument #1 ($value) must be passed by reference, value given in /in/bERrp on line 7 array(2) { [0]=> string(3) "foo" [1]=> string(3) "bar" }

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