3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function g($x=0){return$x?'g'.$x:function($y){return g($y?:'o');};} $x=g(); echo $x('al'); /* echo g('al') , PHP_EOL; echo g()('al') , PHP_EOL; echo g()()('al') , PHP_EOL; echo g()()()('al') , PHP_EOL; */
based on R8HXa
Output for 5.3.0 - 7.1.0
gal
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/VWX5N on line 2
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 T_FUNCTION in /in/VWX5N on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/VWX5N on line 2
Process exited with code 255.