For security purposes, we have disabled several PHP functions that are deemed dangerous. We do not recommend any customers to use them, unless you really need them. The steps to enable them are:
1) Create an empty php.ini file in your computer
2) Copy and paste the following line in the file
disable_functions = system,exec,passthru,shell_exec,proc_open,proc_get_status,proc_terminate,proc_close,virtual,popen,show_source,curl_multi_exec
3) Remove the function you want to enable from the line
4) Upload it to the directory your script is installed
Enabling any of these functions are extremely dangerous and open up your account to hackers. Do it at your own risk.
Several copies of the php.ini is needed if you need the function to work in multiple directories.