The php.ini file will handle all of the PHP settings and their values. This should only be changed at the advice of your webdesigner or a script you wish to install.
You can edit an existing php.ini, or create a new text file and name it php.ini
For example, if your site had these settings in a .htaccess file:
.htaccess
php_value upload_max_filesize 10M
php_value post_max_size 10M
php_value max_execution_time 30
vexxhost users must put them in a php.ini file instead. Here is the proper syntax:
php.ini
upload_max_filesize = 10M
post_max_size = 10M
max_execution_time = 30