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Or, is there any other way to do this, through .htaccess file?
I don't have root access, but server owner does - he just doesn't know how to do it.
The php.ini file is read once when the server starts up. Its configuration setting will be shared for all virtual hosts. If you want to change settings for individual virtual hosts use the PHP Apache directives [php.net] whereever you define your virtual hosts.
#!/usr/local/bin/php -c <path>¦<file> //Look for php.ini here