使用 php 如何检查 GZIP 是否已打开？

Question

I am not asking for an online tool. I'm also not asking how to turn on or turn off gzip.

What I want to know, is how, within my php, that I can check to see if gzip will encode the current buffer or not.

Answer 1

If you mean that you want to know whether or not mod_deflate in Apache has been activated, there's no API in PHP to determine that. You could, obviously, use a shell command and parse the output, but it's probably not the preferred way. The question is though: why should PHP care if the output is gzipped?

Answer 2

I'm not 100% sure what you mean by gzip will encode the current buffer but i assume you mean "compress the output before sending it"

if(ini_get("zlib.output_compression")) {
    echo "On";
} else {
    echo "off";
}

---

Should you be talking about ob_* functions and output streams there is ob_get_status but afaik you can't check if that was started with ob_gzhandler() or not. Your application would have to track that. But zlib compression is preferred anyways

Answer 3

probably like so:

ini_get('zlib_output_compression');

(for the manual see here: http://php.net/manual/en/function.ini-get.php )