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<?php $duration = '4m50s'; var_dump(preg_split('/((\d+)h)?((\d+))m)?((\d+)s)?/', $duration, null, PREG_SPLIT_NO_EMPTY & PREG_SPLIT_OFFSET_CAPTURE));
Output for 4.3.11 - 7.2.0
Warning: preg_split(): Compilation failed: unmatched parentheses at offset 17 in /in/98Ti6 on line 5 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: unmatched parentheses at offset 17 in /in/98Ti6 on line 5 bool(false)