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<?php $a = [ ['a', 'b', 'c'], ['d', 'e', 'f'], ]; array_walk_recursive($a, function(&$v) { $v = strtoupper($v); } ); print_r($a);
Output for git.master_jit, git.master, rfc.property-hooks
Array ( [0] => Array ( [0] => A [1] => B [2] => C ) [1] => Array ( [0] => D [1] => E [2] => F ) )

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