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run code in 150+ php & hhvm versions
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<?php $value = ' [2] => TRUE'; $value = preg_replace("/\s+\[(\d+)\]\s+=>/g", " $1 =>", $value); echo $value;
based on JRCEb
Output for 4.3.11 - 7.1.0
Warning: preg_replace(): Unknown modifier 'g' in /in/Jr9Lh on line 4
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/Jr9Lh on line 4