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run code in 200+ php & hhvm versions
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<?php $dirname = ("{$_SERVER['DOCUMENT_ROOT']}/f1/f2/");echo $dirname;
Output for 5.2.3 - 7.2.0
/f1/f2/
Output for 4.3.0 - 5.2.2
Notice: Undefined index: DOCUMENT_ROOT in /in/bisOT on line 3 /f1/f2/