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run code in 150+ php & hhvm versions
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<?php $current = null; $count = 0; while ($current !== 0xffff) { $count++; $bytes = openssl_random_pseudo_bytes(2); $current = unpack("S", $bytes); } var_dump($count);
based on Jkstj
Output for 5.4.34 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0

Process exited with code 137.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.4.32
Fatal error: Call to undefined function openssl_random_pseudo_bytes() in /in/rSq9d on line 9
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: openssl_random_pseudo_bytes() in /in/rSq9d on line 9
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: openssl_random_pseudo_bytes() in /in/rSq9d on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: openssl_random_pseudo_bytes() in /in/rSq9d on line 9