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Mosttimes you don't have access to the php.ini or httpd.conf file (See your hosters documentation). You may try to put
php_admin_flag allow_url_fopen off
in a .htaccess file in the directory where mainfile.php is located. If you have no permissions to change it, your server will crash with an html 500 error.
In that case, remove the file again and open a ticket to your hoster and ask them to set it to off.