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run code in 150+ php & hhvm versions
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<?php if(empty($myvar)){ if(isset($myvar)) echo $myvar; else echo "variable not set"; } if(!$myVar) { echo "variable not sessst" ; } if($input === 0) echo "1223";
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
variable not set Notice: Undefined variable: myVar in /in/pFVM5 on line 10 variable not sessst Notice: Undefined variable: input in /in/pFVM5 on line 15
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
variable not set Notice: Undefined variable: myVar in /in/pFVM5 on line 10 variable not sessst Notice: Undefined variable: input in /in/pFVM5 on line 15