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run code in 150+ php & hhvm versions
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<?php $c = crypt(NULL, '$2y$07$test'); var_dump($c);
Output for 5.5.0 - 7.1.0
string(2) "*0"
Output for 5.3.7 - 5.4.45
string(60) "$2y$07$test$$$$$$$$$$$$$$$$$.ziU3vTYmZpWCeg5S0ojPeALd8oJ6zBK"
Output for 5.3.2 - 5.3.6
string(13) "$2OahnOya9Dwg"
Output for 5.3.0 - 5.3.1
string(13) "$2xD5RJNGWBNc"
Output for 4.3.0 - 5.2.17

Process exited with code 139.