rewrite - RewriteCond always match incorrectly

If I write:

echo "SCRIPT_NAME: ".@$_SERVER['SCRIPT_NAME']."
";

?>

SCRIPT_NAME: /index.php

The line above is showed.

I'm using these rewrite lines

RewriteCond %{SCRIPT_NAME} !^/index\.php$

RewriteRule .* http://example.com/404 [L]

I have checked:

http://example.com/foo

http://example.com/bar

http://example.com/hdhd

The RewriteCond is matched then I'm being redirect to 404

[03/Aug/2013:13:07:48 +0200] [example.com/sid#23c3710][rid#263afe8/initial] (4) [perdir /var/www/vhosts/example.com/httpdocs/] RewriteCond: input='' pattern='!^/index\\.php$' => matched
[03/Aug/2013:13:07:48 +0200] [example.com/sid#23c3710][rid#263afe8/initial] (2) [perdir /var/www/vhosts/example.com/httpdocs/] rewrite '404' -> 'http://example.com/404'
[03/Aug/2013:13:07:48 +0200] [example.com/sid#23c3710][rid#263afe8/initial] (2) [perdir /var/www/vhosts/example.com/httpdocs/] implicitly forcing redirect (rc=302) with http://example.com/404
[03/Aug/2013:13:07:48 +0200] [example.com/sid#23c3710][rid#263afe8/initial] (1) [perdir /var/www/vhosts/example.com/httpdocs/] escaping http://example.com/404 for redirect
[03/Aug/2013:13:07:48 +0200] [example.com/sid#23c3710][rid#263afe8/initial] (1) [perdir /var/www/vhosts/example.com/httpdocs/] redirect to http://example.com/404 [REDIRECT/302]

But if I use example.com/index.php/nnn or
example.com/index.php

I'm still being redirected

[03/Aug/2013:13:10:41 +0200] [example.com/sid#23c3710][rid#263eff8/initial] (4) [perdir /var/www/vhosts/example.com/httpdocs/] RewriteCond: input='' pattern='!^/index\\.php$' => matched
[03/Aug/2013:13:10:41 +0200] [example.com/sid#23c3710][rid#263eff8/initial] (2) [perdir /var/www/vhosts/example.com/httpdocs/] rewrite '404' -> 'http://example.com/404'
[03/Aug/2013:13:10:41 +0200] [example.com/sid#23c3710][rid#263eff8/initial] (2) [perdir /var/www/vhosts/example.com/httpdocs/] implicitly forcing redirect (rc=302) with http://example.com/404
[03/Aug/2013:13:10:41 +0200] [example.com/sid#23c3710][rid#263eff8/initial] (1) [perdir /var/www/vhosts/example.com/httpdocs/] escaping http://example.com/404 for redirect
[03/Aug/2013:13:10:41 +0200] [example.com/sid#23c3710][rid#263eff8/initial] (1) [perdir /var/www/vhosts/example.com/httpdocs/] redirect to http://example.com/404 [REDIRECT/302

I can't see anything at input='', it is empty at each request. Then never will be different like the pattern, then always will match

Any suggestion?

Answer

The Apache variable you want is called %{SCRI­PT_­FIL­ENAME}.

In PHP's $_SERVER super global, both SCRIPT_NAME and SCRIPT_FILENAME exist but in Apache, only %{SCRIPT_FILENAME} exists.

It's not clear from the documentation exactly what each of the PHP variables contains but in my testing, SCRIPT_FILENAME is a full filesystem path and SCRIPT_NAME is either the path from the document root or the path component of the URL.