Description:
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This is same as #37157. But may be I will better describe the problem. Because Dmitry closed #37157 as NOT A BUG.

Ok, test environment is Apache 2.2.X with PHP 5.3.X. Base Apache config is:

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Alias /php-bin/                        /www/php-bin/php5

<Directory /www/php-bin/>

   Options ExecCGI
   SetHandler fastcgi-script

</Directory>

AddHandler                              php5-script     .php
Action                                  php5-script     /php-bin/php5

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FastCGI (mod_fastcgi) related config is (this is not important for reproducing this bug, it is provided only FYI):

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FastCgiIpcDir                           /var/run/apache22/fastcgi/
FastCgiWrapper                          On
FastCgiConfig                           -idle-timeout 30 -killInterval 300 -maxClassProcesses 1 -maxProcesses 100 -minProcesses 0 -pass-header HTTP_AUTHORIZATION -restart-delay 2 -singleThreshold 100

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PHP was compiled only with CGI SAPI support and is run with following wrapper (it's /www/php-bin/php5 file mentioned earlier):

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#!/bin/sh

PHP_CGI=/usr/local/bin/php-cgi
PHP_FCGI_CHILDREN=4
PHP_FCGI_MAX_REQUESTS=500

export PHP_FCGI_CHILDREN
export PHP_FCGI_MAX_REQUESTS

exec $PHP_CGI

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Ok, last but not least the PHP's FastCGI config:

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;doc_root
;user_dir
cgi.force_redirect = 1
cgi.fix_pathinfo = 0

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Ok, so when you hit:

http://[domain]/index.php

it works, the Apache translates this request according to Action directive to

http://[domain]/php-bin/php5/index.php

and you will see the results.

When you hit http://[domain]/php-bin/php5/index.php directly, it will also works (FastCGI PHP SAPI incorrectly does not check the REDIRECT_STATUS environmental variable for value of 200).

When you change PHP cgi.fix_pathinfo to 1 (so the environmental variables conforms to FastCGI/CGI specs), the last request incorrectly determine the /www/php-bin/php5 as the PHP script and executes it. This is because one of the main jobs of FastCGI/CGI SAPI is to determine WHAT to execute. When fix_pathinfo is set to 1, it uses also REDIRECT_URL env variable, which is not set when you access directly interpreter with passed script as PATH_INFO (http://[domain]/php-bin/php5/index.php).

The only workaround at this time is use mod_rewrite and disable access to the interpreter:

RewriteEngine on
RewriteCond %{ENV:REDIRECT_STATUS} !200
RewriteRule ^/php-bin/php5 - [F]


Conclusion, this is NOT actually mod_fastcgi and/or configuration issue, this is really bug in FastCGI/CGI SAPI of PHP (in opossite what Dmitry says in #37157)





Test script:
---------------
See above

Expected result:
----------------
See above

Actual result:
--------------
See above