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<?php $re = '/^(?:([0-9]+) X,)? ?(?:([0-9]+) Y,)?(?: Z)?$/m'; $str = <<<_ 66 X, 55 Y, Z 66 X, 55 Y, 66 X, Z 55 Y, Z 66 X, 55 Y, \n _; preg_match_all($re, $str, $matches, PREG_SET_ORDER); foreach ($matches as $match) { unset($match[0]); foreach (['null', 'null'] as $key => $value) { if (!isset($match[$key + 1]) || $match[$key + 1] === '') $match[$key + 1] = $value; } echo implode(" - ", $match), PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
66 - 55 66 - 55 66 - null null - 55 66 - null null - 55 null - null

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