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run code in 150+ php & hhvm versions
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<?php $q = '\'; drop table `user`'; echo strtolower(htmlentities(urlencode(($q)))); echo filter_var($q, FILTER_SANITIZE_STRING);
based on Zs21m
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
%27%3b+drop+table+%60user%60&#39;; drop table `user`
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
%27%3b+drop+table+%60user%60 Fatal error: Call to undefined function filter_var() in /in/nHFKF on line 6
Process exited with code 255.
Output for 4.4.5 - 4.4.9
%27%3b+drop+table+%60user%60 Fatal error: Call to undefined function: filter_var() in /in/nHFKF on line 6
Process exited with code 255.
Output for 4.3.2 - 4.4.4
%27%3b+drop+table+%60user%60 Fatal error: Call to undefined function: filter_var() in /in/nHFKF on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1
%27%3b+drop+table+%60user%60 Fatal error: Call to undefined function: filter_var() in /in/nHFKF on line 6