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run code in 150+ php & hhvm versions
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<?php $a = ""; for($i=0;$i<1000;$i++) { $a = strtolower(strtoupper(implode(array_merge(str_split($a), range("a", "z"))))); }

Abusive script

This script was stopped while abusing our resources

Output for 5.3.17, 5.4.2, 5.5.4 - 7.0.12
Output for 5.3.0 - 5.3.16, 5.3.18 - 5.4.1, 5.4.3 - 5.4.11

Process exited with code 137.