[php-src] PR #24023: main: Ignore array-valued INI entries where a string is expected

Pull Request: https://github.com/php/php-src/pull/24023 Author: iliaal Array syntax such as memory_limit[] = 5M stores an array in the configuration hash, and in the [PATH=]/[HOST=] and .user.ini hashes, but four readers treat every value as a string: php_ini_activate_config(), zend_register_ini_entries_ex(), ${} expansion in the INI parser, and cfg_get_string(). The array's arData pointer then becomes the string length, so a .user.ini entry kills the request with a multi-terabyte allocation failure and a top-level php.ini or -d entry crashes PHP at startup. These readers now skip non-string values, which is the same fallback startup already uses when a value is rejected.