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run code in 150+ php & hhvm versions
Bugs & Features
<?php $data = '12345'; var_dump($data, bin2hex(hex2bin($data))); // outputs : // string(5) "12345" // string(4) "1234"
Output for 5.4.4 - 5.6.28, 7.0.0 - 7.1.0
Warning: hex2bin(): Hexadecimal input string must have an even length in /in/QI1u8 on line 4 string(5) "12345" string(0) ""
Output for hhvm-3.12.0
Warning: hex2bin: malformed input in /in/QI1u8 on line 4 string(5) "12345" string(0) ""
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.3
string(5) "12345" string(4) "1234"
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.3.29
Fatal error: Call to undefined function hex2bin() in /in/QI1u8 on line 4
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/QI1u8 on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: hex2bin() in /in/QI1u8 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: hex2bin() in /in/QI1u8 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: hex2bin() in /in/QI1u8 on line 4