Warning: ini_set() has been disabled for security reasons

[mandville]

If your host does not allow you to access or alter the php.ini file then trying to create one will be no good.
php.ini files are normally unique to each setup

[PhilD]

Which part of the answers are you not understanding?
As has been said before, what you can change is dependent on what your host allows you to change. That is normally a very limited set of options. The specific way these options can be changed is also dependent on the server setup as determined by your host an is server setup specific.

I suggest some reading starting here
http://php.net/manual/en/configuration.changes.php

[jeganmmk89]

Definitely hoster's help need for solve this problem...

[sgwd]

From my hosting company (this worked perfectly although I did have to set permissions to 600 and add the timezone to all my joomla sites):

This error indicates that ini_set has been disabled globally due to various security issues. How to fix it:

1. Login via FTP then create blank php.ini file inside joomla script folder. For example, if you installed Joomla into root of public_html/joomla folder, create php.ini file there.

2. Inside that file put the following:
disable_functions = show_source, system, shell_exec, passthru, exec, phpinfo, popen, proc_open, allow_url_fopen, ini_alter, proc_terminate, proc_get_status, proc_nice, escapeshell, escapeshellarg, escapeshellcmd, show_source, dl, symlink

3. Save file.

4. Set permissions 400 (chmod 400).

5. Repeat steps for folder "administrator".

NOTE: If you receive "time zone errors" set permissions 600 to php.ini file then add following line:
date.timezone="America/New_York"
Or other time zone you use.

[mandville]

NOITE: - not all hosts will accept or honour any php.ini files in their setup, please check with your host.

[PhilD]

Find a better host that knows how to properly setup the server.

Disabling PHP functions is poor practice and won't protect the server.

Disabling ini_set() will break Wordpress, Joomla and many other popular programs.

Commenting out the offending lines in multiple files will break the functionality of Joomla, Wordpress and many other popular programs.