[php-src] Issue #8201: array_unique with SORT_REGULAR flag does not always work as expected

Issue: https://github.com/php/php-src/issues/8201 Comment Author: damianwadley array_unique performs a sort and that means it's susceptible to the SORT_REGULAR problem (as documented in [sort](https://www.php.net/manual/en/function.sort.php)): > Warning > > Be careful when sorting arrays with mixed types values because sort() can produce unexpected > results, if flags is SORT_REGULAR. Here, the "mixed types" aren't strings versus numbers but strings vs _numeric strings_. Because PHP compares numeric strings as if they were numbers.