zend_memnistr results are incorrect under certain conditions

The following code:

<?php
var_dump(stripos('aaBBBBBbb', 'b'));

Resulted in this output:

int(7)

But I expected this output instead:

int(2)

This occurs when the following conditions are met:

$needle is single character
(Number of characters from the first lowercase letter to the end) >= (Number of characters from the beginning to the first uppercase letter)
Uppercase letters appear before lowercase letters

PHP8.2+

any

As you know, this affects stripos() and stristr().

The master branch uses php_memnistr in the curl options set, but since needle is not a single character, it is not affected.

Fixed a bug in zend_memnistr with single character needle

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