3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(shell_exec('echo "hello world"'));
Output for 5.6.28, 7.0.14 - 7.1.0
NULL
Output for 4.3.2 - 5.6.25, 7.0.0 - 7.0.10
Warning: shell_exec(): Unable to execute 'echo "hello world"' in /in/0QP9V on line 2 bool(false)
Output for hhvm-3.10.0 - 3.12.0
string(37) "Failed to exec: `echo "hello world"' "
Output for 4.3.0 - 4.3.1
Warning: shell_exec() [http://www.php.net/function.shell-exec]: Unable to execute 'echo "hello world"' in /in/0QP9V on line 2 bool(false)