https://bugs.php.net/bug.php?id=73634&edit=2
PHP :: Bug #73634 :: grapheme_strpos illegal memory access
phpbuggraphemestrposillegal
https://www.php.net/strpos%28%29
PHP: strpos - Manual
Find the position of the first occurrence of a substring in a string
phpstrposmanual
https://pyramidin.narod.ru/php42/f/strpos.html
strpos
strpos
https://docs.pinot.apache.org/release-1.0.0/configuration-reference/functions/strpos
strpos | release-1.0.0 | Apache Pinot Docs
This section contains reference documentation for the STRPOS function.
apache pinotstrposreleasedocs
https://pear.php.net/bugs/bug.php?id=6769
Bug #6769 :: ImageMap.php doesnot check for boolean false with strpos
bugimagemapphp
https://bugs.php.net/bug.php?id=18826
PHP :: Bug #18826 :: slow string search (strpos,ereg etc.)
string searchphpbugslowstrpos