Fatal error: Uncaught ValueError: substr_count(): Argument #4 ($length) must be contained in argument #1 ($haystack) in /in/J4vqa:6
Stack trace:
#0 /in/J4vqa(6): substr_count('010010101011011...', '1', 65, 10)
#1 {main}
thrown in /in/J4vqa on line 6
Process exited with code 255.