3v4l.org - online PHP shell, execute code in 100+ different PHP versions!

based on dRFLu
Output for 5.0.0 - 5.5.4
Array ( [0] => Hey [1] => H [2] => e [3] => y [4] => He [5] => you [6] => y [7] => o [8] => u [9] => yo [10] => guys [11] => g [12] => u [13] => y [14] => s [15] => gu [16] => guy )
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: str_split() in /in/gZn8p on line 7
Process exited with code 255.
Output for 4.3.0 - 4.4.4
Fatal error: Call to undefined function: str_split() in /in/gZn8p on line 7
Process exited with code 255.