[php-src] Issue #7953: Calling ob_clean() after ob_start('gz_handler') does not set Content-Encoding

Issue: https://github.com/php/php-src/issues/7953 Comment Author: cmb69 > I'm also seeing odd behavior with a flush + clean in that the special > "ob_gzhandler" issues a "Failed to delete buffer" notice while the wrapped > ob_gzhandler() call does not. The special ob_gzhandler makes the handler immutable (i.e. uncleanable and unremoveable) after the headers have been sent. The wrapped ob_gzhandler doesn't do that. I'm not sure whether uncleanability is required, but at least the handler must be unremoveable, or otherwise output after removing the handler causes issues: ````php ob_start(fn($buffer, $phase) => ob_gzhandler($buffer, $phase)); echo "Hello"; ob_flush(); ob_end_clean(); echo "world"; ```` Note to self: check ob_iconv_handler regarding these issues.