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run code in 200+ php & hhvm versions
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<?php $x = INF; var_dump($x);
based on mAaf2
Output for 4.3.6 - 7.2.0
float(INF)
Output for 4.3.0 - 4.3.5
Notice: Use of undefined constant INF - assumed 'INF' in /in/U8JPq on line 2 string(3) "INF"