This is nice
Fatal error: Uncaught ValueError: substr_count(): Argument #4 ($length) must be contained in argument #1 ($haystack) in /in/EQUZH:3
Stack trace:
#0 /in/EQUZH(3): substr_count('This is nice', 'is', 11, 9)
#1 {main}
thrown in /in/EQUZH on line 3
Process exited with code 255.