3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $letter = 'y'; print_r(array_filter(get_defined_functions()['internal'], function($function) {return $function[0] == $GLOBALS['letter'];}));
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/nLX4J on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/nLX4J on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/nLX4J on line 5
Process exited with code 255.