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<?php namespace blah; function test($callback){ var_dump($callback); if($callback instanceof \Closure){ echo "yeah, it's a closure\n"; } } namespace blah2; \blah\test(function ($param){ echo $param; });
Output for 5.3.0 - 7.3.5
object(Closure)#1 (1) { ["parameter"]=> array(1) { ["$param"]=> string(10) "<required>" } } yeah, it's a closure
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/UtpB2 on line 3
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_STRING in /in/UtpB2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UtpB2 on line 3
Process exited with code 255.