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<?php $test = [ 'key1' => ' value1', ]; function clean (&$value) { $value = trim ($value); return $value; } var_dump(array_filter ($test, 'clean'));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: clean(): Argument #1 ($value) must be passed by reference, value given in /in/M1kW9 on line 12 array(1) { ["key1"]=> string(9) " value1" }

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