JonB wrote:I think PHP is the only real worry
Nothing more to say
. PHP-scripts depending very strictly to PHP versions, especially in the last time of hugh changes in the PHP core.
jekell wrote:What I want to do actually is to have a local web on my PC which is "as close as possible" to what my web hosting provider is giving and where I installed a Joomla 1.5.15.
In most cases it's enough to look for the Major and Minor version number of PHP. For example it does matter if you use PHP 5.2.X or 5.3.X, but it doesn't matter if you use PHP 5.2.9 or PHP 5.2.10.
In some cases minor releases have bugs in a function that make them incompatible to some webapplications (for example PHP 4.3.9, 4.4.2 or 5.0.4 are not supported by Joomla).
But all of that can be read in the technical requirements of the single webapplications.
Technical Requirements JoomlaWhat really matters is the PHP and Apache configuration. They can be very very different. If you want to come close to your online webhoster, then thats the point you should care about.