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

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";
}

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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