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run code in 150+ php & hhvm versions
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<?php $data = 'GET|/service/game_world_stats|{"timestamp":"1407262832","action":"getPlayerCounts"}|';var_dump(substr(hash_hmac('sha512', $data, ''), 0, 16));
based on mHq6D
Output for 5.1.2 - 7.1.0
string(16) "37e1f979bf2c8f26"
Output for 5.0.0 - 5.1.1
Fatal error: Call to undefined function hash_hmac() in /in/SYfZE on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: hash_hmac() in /in/SYfZE on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: hash_hmac() in /in/SYfZE on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: hash_hmac() in /in/SYfZE on line 3