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run code in 150+ php & hhvm versions
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<?php $OOO000000 = urldecode('%66%67%36%73%62%65%68%70%72%61%34%63%6f%5f%74%6e%64'); echo $GLOBALS[$OOO000000]; ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined index: fg6sbehpra4co_tnd in /in/bBcjr on line 1
Output for hhvm-3.10.0 - 3.12.0
Output for 4.3.0 - 5.2.17
Notice: Undefined index: fg6sbehpra4co_tnd in /in/bBcjr on line 1