title: expose_php not work (nginx)
body: <p>at the first time , i try to use proxy_hide_header to strip it off , but it doesn't work</p>
  
  <p>then I had changed the etc/php.ini , set the expose_php = Off</p>
  
  <p>but the X-Powered-By header just still there</p>
  
  <pre><code>root@wordpress:~# ps -ef |grep php | grep -v grep
  root     10643     1  0 23:22 ?        00:00:00 php-fpm: master process (/usr/local/php-5.3.26/etc/php-fpm.conf)                                                                                  
  nobody   10644 10643  0 23:22 ?        00:00:00 php-fpm: pool www                                                                                                                                 
  nobody   10645 10643  0 23:22 ?        00:00:00 php-fpm: pool www                                                                                                                                 
  root@wordpress:~# 
  </code></pre>
  
  <p>my php version is  php 5.3.26</p>
  
  <pre><code>Configure Command =&gt;  './configure'  '--prefix=/usr/local/php-5.3.26' '--with-config-file-path=/usr/local/php-5.3.26/etc' '--enable-fpm' '--enable-debug' '--with-openssl' '--with-pcre-regex' '--with-zlib' '--with-bz2' '--with-curl=/usr/lib/' '--with-readline=/lib' '--with-libxml-dir=/usr/lib' '--with-mysql=/usr/local/mysql'
  
  PHP Version =&gt; 5.3.26
  
  System =&gt; Linux wordpress.ruby-mine.com 3.9.3-x86_64-linode33 #1 SMP Mon May 20 10:22:57 EDT 2013 x86_64
  Build Date =&gt; Jun 11 2013 21:58:26
  Configure Command =&gt;  ./configure  --prefix=/usr/local/php-5.3.26 --with-config-file-path=/usr/local/php-5.3.26/etc --enable-fpm --enable-debug --with-openssl --with-pcre-regex --with-zlib --with-bz2 --with-curl=/usr/lib/ --with-readline=/lib --with-libxml-dir=/usr/lib --with-mysql=/usr/local/mysql
  Server API =&gt; Command Line Interface
  Virtual Directory Support =&gt; disabled
  Configuration File (php.ini) Path =&gt; /usr/local/php-5.3.26/etc
  </code></pre>
  
  <p>and I also note that , the output of php -i shows that expose_php = on</p>
  
  <pre><code>root@wordpress:/usr/local/php/etc# php -i | grep Configuration
  Configuration File (php.ini) Path =&gt; /usr/local/php-5.3.26/etc
  Loaded Configuration File =&gt; (none)
  Configuration
  root@wordpress:/usr/local/php/etc# 
  
  
  root@wordpress:/usr/local/php-5.3.26/etc# ll /usr/local/php-5.3.26/etc/php.ini
  -rw-rw-rw- 1 root root 69628 Jun 11 22:51 /usr/local/php-5.3.26/etc/php.ini
  root@wordpress:/usr/local/php-5.3.26/etc# 
  </code></pre>