[php-src] Issue #8988: PHP 8.2.0-alpha3 - DateTime no longer accepts `@` for unixepoc timestamps in constructor.

Issue: https://github.com/php/php-src/issues/8988 Author: Dygear ### Description The following code: ```php <?php new DateTime('@' . filemtime($this->filePath)); ``` Resulted in this output: ``` Fatal error: Uncaught Exception: Failed to parse time string (@) at position 0 (@): Unexpected character in file. ``` But I expected this output instead: Should accept has it does in 8.1.8. Is this a regression or expected as of 8.2.0? I could not find anything in the docs or release notes that said this is no longer allowed. And if it is, that's a shame because it breaks my use case as seen above. ### PHP Version PHP 8.2.0-alpha3 ### Operating System Debian 11.4.0