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run code in 150+ php & hhvm versions
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<?php $key = 'aldanux'; $string = 'string to be encrypted'; $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key)))); $decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($encrypted), MCRYPT_MODE_CBC, md5(md5($key))), "\0"); var_dump($encrypted); var_dump($decrypted);
Output for 7.0.6 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function mcrypt_encrypt() in /in/YE6Ss:5 Stack trace: #0 {main} thrown in /in/YE6Ss on line 5
Process exited with code 255.
Output for 5.4.0 - 5.5.34, 5.6.8 - 5.6.20, hhvm-3.12.0, 7.0.0 - 7.0.5
string(44) "VubfDhrI+2OT3M5QbN5OrtsKZuhxcSuovrNJDrvOXNw=" string(22) "string to be encrypted"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.3.29, 5.5.35, 5.6.21 - 5.6.28
Fatal error: Call to undefined function mcrypt_encrypt() in /in/YE6Ss on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: mcrypt_encrypt() in /in/YE6Ss on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: mcrypt_encrypt() in /in/YE6Ss on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mcrypt_encrypt() in /in/YE6Ss on line 5