3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $regex = '(^([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*|\0\\\\\0)$)'; $classes = [ 'foo', 'foo\\bar', 'foo\\bar\\baz', ]; foreach ($classes as $class) { var_dump(preg_match($regex, $class)); }
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(0) int(0)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/80YSU 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/80YSU on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/80YSU on line 5
Process exited with code 255.