substr_replace('string', 'replacement', $start),
Strings::substringReplace('string', 'replacement', $start)
);
for ($length = -10; $length <= 10; $length += 5) {
substr_replace('string', 'replacement', $start),
Strings::substringReplace('string', 'replacement', $start)
);
for ($length = -10; $length <= 10; $length += 5) {