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I installed nginx on Ubuntu Hardy and immediately realized that the PHP scripts were getting empty request arrays, ie whether GET or POST nothing was coming through, even the $_REQUEST array was empty.

When I switch back to Apache it was all fine.

The installation nginx version is 0.6.35-0ubuntu1.1~hardy1 and PHP is PHP Version 5.2.4-2ubuntu5.10.

What could be wrong?

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Are you using rewrite or redirect rules? – ircmaxell Aug 16 '10 at 15:40
No, there is not rewrites or redirects – vfclists Aug 16 '10 at 17:46
up vote 4 down vote accepted

Check if this set in your "location"-section for your fastcgi-module

 fastcgi_param  QUERY_STRING     $query_string;

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I disable the basic fastcgi_params file from inclusion, because I didn't know how may were needed. Worth learning about though. – vfclists Aug 16 '10 at 20:33

It's a feature of the try_files command in nginx that the query_string is not passed automatically to the rewritten file but instead must be passed explicitly. Because of this _$SERVER['QUERY_STRING'] is always empty, and so the the variables $_REQUEST and $_GET are also not set.

From the Nginx documentation:

Unlike with rewrite, $args are not automatically preserved if the fallback is not a named location. If you need args preserved, you must do so explicitly:

try_files $uri $uri/ /index.php?q=$uri&$args;

or with just the arguments

try_files $uri $uri/ /index.php?$args;

If you want to guarantee to get the original arguments then use $query_string which is the same as $args except that $query_string is read-only.

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Try to check the variables_order in php config file used by nginx.

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The variables_order is EGPCS. It is set to the default – vfclists Aug 16 '10 at 17:47

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