What does it mean to run PHP in quiet mode?

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This only concerns the PHP interpreter built against the CGI SAPI. This version sends a few basic HTTP headers before any actual output:

X-Powered-By: PHP/5.3.3-1ubuntu9.3
Content-type: text/html

"(echo) What I actually wanted to have"

So basically the -q commandline flag prevents any header() from being written to stdout.

The purpose is to use the php-cgi binary in lieu of the php CLI variant for console scripts. Usually you see following shebang in such scripts to force php-cgi to behave like the -cli version:

#!/usr/bin/php-cgi -qC

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