3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php //$v = "system"; $b = "perl -e 'print 1;'"; `$b`;
Output for 5.6.28, 7.0.14 - 7.3.0rc4
Output for 4.3.2 - 5.6.25, 7.0.0 - 7.0.10
Warning: shell_exec(): Unable to execute 'perl -e 'print 1;'' in /in/Hv56E on line 4
Output for 4.3.0 - 4.3.1
Warning: shell_exec() [http://www.php.net/function.shell-exec]: Unable to execute 'perl -e 'print 1;'' in /in/Hv56E on line 4