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run code in 200+ php & hhvm versions
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<?php $where = 'a, b, c, d'; $patterns = "/\b\w(\w*)\b/g"; echo preg_replace($patterns, $where, '$1'); ?>
Output for 4.3.11 - 7.2.0
Warning: preg_replace(): Unknown modifier 'g' in /in/bCsaX on line 4
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/bCsaX on line 4