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run code in 150+ php & hhvm versions
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<?php var_dump(crypt('rasmuslerdorf', '_J9..rasm'));
Output for 5.3.0 - 7.1.0
string(20) "_J9..rasmBYk8r9AiWNc"
Output for 4.3.0 - 5.2.17

Process exited with code 139.