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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array('FILE'); $b = (string)$a; var_dump(strtoupper('any_TAG'));
Output for 4.3.0 - 4.4.9, 5.4.0 - 7.2.0
Notice: Array to string conversion in /in/DXbTe on line 5 string(7) "ANY_TAG"
Output for 5.0.0 - 5.3.29
string(7) "ANY_TAG"