您需要通过导航\\ Apache2的\\ bin添加禁用PHP安全模式（而不是文件夹），重新启动服务器。

并的这里。它有助于

(There is some mention of this online, but none of the solutions worked.) I want to be able to use shell_exec and exec from a PHP script.

Meaning, use:

         <? exec("echo hello world"); ?> 

or

         <? shell_exec("echo hello world"); ?>

According to a link I found online (http://forums.cpanel.net/f5/enable-shell_exec-one-user-109601.html), one way to do it is to add under VirtualHost the directives:

             <IfModule mod_php5.c>
             php_admin_value suhosin.executor.func.blacklist = "shell_exec"
             </IfModule>

but when I looked at the configuration file, trying to restart the webserver, I get:

           28/07/14 17:18:26:    Syntax error on line 1 of /etc/httpd/conf.d/serv1.conf:
           28/07/14 17:18:26:    php_admin_value takes two arguments, PHP Value Modifier (Admin)

and the server is not restarted.

Any ideas how to enable exec and shell_exec? I can't trace the origin of this error.

EDIT: I am not the root on the machine. I couldn't find an php.ini file, but there is an /etc/httpd/conf.d/php.conf file and it has no disable_functions.

Here it is:

      #
      # PHP is an HTML-embedded scripting language which attempts to make it
      # easy for developers to write dynamically generated webpages.
      #
      <IfModule prefork.c>
        LoadModule php5_module modules/libphp5.so
      </IfModule>
      <IfModule worker.c>
        LoadModule php5_module modules/libphp5-zts.so
      </IfModule>

      #
      # Cause the PHP interpreter to handle files with a .php extension.
      #
      AddHandler php5-script .php
      AddType text/html .php

      #
      # Add index.php to the list of files that will be served as directory
      # indexes.
      #
      DirectoryIndex index.php

      #
      # Uncomment the following line to allow PHP to pretty-print .phps
      # files as PHP source code:
      #
      #AddType application/x-httpd-php-source .phps

You need to disable safe mode in php by navigating through \Apache2\bin(not folder) and restart the server.

Check here and here.It would help