Question

Is (function_exists('ob_gzhandler') && ini_get('zlib.output_compression')) enough ?

I want to check if the host is serving compressed pages within one of the pages 🙂

Answer 1

For PHP, they’ll do fine.

However, if your referring to compression of pages back to clients, you’ll also need to check it’s enabled in apache (assuming your using apache you’ll need the mod_gzip.c OR mod_deflate.c modules).

For instance:
# httpd -l (apache 2)

Ive also seen mention of needing to implement .htaccess overrides in the past:

#compress all text & html:
AddOutputFilterByType DEFLATE text/html text/plain text/xml
# Or, compress certain file types by extension:
<Files *.html>
SetOutputFilter DEFLATE
</Files>