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run code in 150+ php & hhvm versions
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<?php echo strtoupper('hth9zee0042230858f1500'); echo " "; echo strtoupper('hth9zee00422308f31500');
Output for 4.3.0 - 7.1.0
HTH9ZEE0042230858F1500 HTH9ZEE00422308F31500