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run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = "B1A2C"; var_dump(implode("/", str_split($string, 2)));
based on ZAtHO
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(7) "B1/A2/C"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: str_split() in /in/ReqMj on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: str_split() in /in/ReqMj on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: str_split() in /in/ReqMj on line 4