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run code in 150+ php & hhvm versions
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<?php $ctx = hash_init( 'sha256', HASH_HMAC, "\0" ); var_dump(hash_final($ctx, true)); var_dump(hash_final($ctx, true));
based on BjdTE
Output for hhvm-3.12.0, 7.0.0 - 7.1.0
string(32) "�g���w/��x�_��ēqVS��B�ŭ" Warning: hash_final(): supplied resource is not a valid Hash Context resource in /in/6fMj0 on line 5 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.3 - 5.6.28
string(32) "�g���w/��x�_��ēqVS��B�ŭ" Warning: hash_final(): 4 is not a valid Hash Context resource in /in/6fMj0 on line 5 bool(false)
Output for 5.1.2 - 5.2.2
string(32) "�g���w/��x�_��ēqVS��B�ŭ" Warning: hash_final(): 1 is not a valid Hash Context resource in /in/6fMj0 on line 5 bool(false)
Output for 5.0.0 - 5.1.1
Fatal error: Call to undefined function hash_init() in /in/6fMj0 on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: hash_init() in /in/6fMj0 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: hash_init() in /in/6fMj0 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: hash_init() in /in/6fMj0 on line 3