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<?php $vars = array(); $arrayKey = '[0][1]'; $vars[0][1] = "two levels deep"; $vars = function($str) use ($vars) { $c = function($v, $w) {return $w ? $v[$w] : $v;}; return array_reduce(preg_split('~\[\'|\'\]~', $str), $c, $vars); }; echo $vars($arrayKey);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "[0][1]" in /in/nFTmv on line 10

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