Fatal error: Uncaught Error: Call to undefined function f() in /in/nHBO4:6
Stack trace:
#0 {main}
thrown in /in/nHBO4 on line 6
Process exited with code 255.
Deprecated: assert(): Calling assert() with a string argument is deprecated in /in/nHBO4 on line 5
Warning: assert(): assert($a): "f();function f($_=1){if($_==1)return;echo "OK";}" failed in /in/nHBO4 on line 5
OK