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<?php $a = array('Hello', 'World', 'PHP'); $a = array_flip($a); array_walk($a, function(&$val, $key) { $val = strlen($key); }); var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["Hello"]=> int(5) ["World"]=> int(5) ["PHP"]=> int(3) }

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