[php-src] Issue #8582: Empty string issue for strpos(), strrpos(), stripos(), strripos(), strstr(), strchr(), strrchr(), and stristr()

Issue: https://github.com/php/php-src/issues/8582 Author: dmitrirussu ### Description Hi following your documentation on php 8.0 I found some incompatibilities, I would like to understand what is the reason of returning position "0" for empty string when "$haystack" is not empty... what issue you are solving here? I would like to argue it is a buggy stuff and nothing more... The following code: ```php // let suppose we have next $haystack = "test"; $needle = ""; $haystack === $needle // => "false" will result in false because $haystack is not empty string stripos($haystack, $needle) // => "0" how do you get this :), is "$haystack" an empty string where is logic, why not keep return "false" If I do search for empty string then I'm expecting "$haystack" to be empty string.... I'm not expecting you to find a void point on the beginning of string or on end of string, middle of string... Could you please provide how many bytes takes empty char into "$haystack = 'test'"? I would say nothing, if nothing then should be false returned ### PHP Version PHP 8.0 ### Operating System ubuntu