3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function g($x=0){return$x?:function($y)use($x){return$x.g($y);};} echo g('al') , PHP_EOL; echo g()('al') , PHP_EOL; echo g()()('al') , PHP_EOL; echo g()()()('al') , PHP_EOL;
based on nomWD
Output for 7.1.0
al 0al Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 0 passed in /in/d94HT on line 6 and exactly 1 expected in /in/d94HT:2 Stack trace: #0 /in/d94HT(6): {closure}() #1 {main} thrown in /in/d94HT on line 2
Process exited with code 255.
Output for 7.0.0 - 7.0.14
al 0al Warning: Missing argument 1 for {closure}(), called in /in/d94HT on line 6 and defined in /in/d94HT on line 2 Notice: Undefined variable: y in /in/d94HT on line 2 Catchable fatal error: Object of class Closure could not be converted to string in /in/d94HT on line 2
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
al 0al Warning: __invoke() expects exactly 1 parameter, 0 given in /in/d94HT on line 2 Notice: Undefined variable: y in /in/d94HT on line 2 Catchable fatal error: Object of class Closure$g;932178983 could not be converted to string in /in/d94HT on line 2
Process exited with code 255.
Output for 5.3.0 - 5.6.28
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/d94HT on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected ':' in /in/d94HT 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 ':' in /in/d94HT on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/d94HT on line 2
Process exited with code 255.