substr vs strpos

gistfile1.aw

<?php

$str = str_repeat('*!', 10);

$start = microtime(true);

for ($i = 0; $i < 100000; $i++) {
  substr($str, 0, 1);
}

printf("substr took: %d\n", (microtime(true) - $start) * 1000);

$start = microtime(true);

for ($i = 0; $i < 100000; $i++) {
  strpos($str, '@');
}

printf("strpos took: %d\n", (microtime(true) - $start) * 1000);

spoler alert: strpos is consistently faster.

+1 substr vs strpos

spoler alert: strpos is consistently faster.

On my end, after 10 checks and increased loops, it was the other way around by at least 1,5x

substr took: 85
strpos took: 129