3v4l.org

run code in 200+ php & hhvm versions
<?php $x = 'test'; $z = 'w'; function char($char) {return $char;} echo "this is a ${trim(' '.++$z.char(' '))}";
Output for 5.5.0 - 5.6.40, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.6
this is a test
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.4.45
Parse error: syntax error, unexpected '(' in /in/0dLop on line 6
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/0dLop on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0dLop on line 6
Process exited with code 255.