[php-src] Issue #9311: is_numeric() limitation

Issue: https://github.com/php/php-src/issues/9311 Author: 8ctopus ### Description is_numeric() is of great help to check if a string contains a number but in some cases, it creates problems: ```php is_numeric('2E822890835372110'); // true is_numeric('64091761E47298917'); // true ``` If I understand correctly, is_numeric detects the E within the string and considers it as exponent, so in the first case 2^822890835372110. In order, to avoid this I would like to suggest the following change to the function: ```php is_numeric(mixed $value): bool ``` to ```php is_numeric(mixed $value, int $flags): bool ``` $flags being a combination of: - NUMERIC_EXPONENT - and maybe some other flags...