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<?php $str = 'This is the string number 123-45-6789-0 which contains 12-34567.'; echo preg_replace_callback('~\d+(?:-\d+)+~', function($m) { return implode('-', array_reverse(explode('-', $m[0]))); } ,$str);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.26, 8.1.0 - 8.1.13
This is the string number 0-6789-45-123 which contains 34567-12.

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