[y2ksw]

What it puts in place of missing images depends on the settings in the options. It may replace the image with a local image (e.g. clear.gif), or keep the link as-is (ignore).

It does check for the name and increments if already present in order to create a new set of images each month.

All links are imported. How they translate to your system however depend on the settings, and probably the *.php images have to be converted. If you decide to keep *.php "images", you will have to add a .htaccess rule for excluding php code execution for the imported files.

On my systems I have the file conversion always on (converto to JPG), because it also removes eventually present WORM's or other "crafted" images. Conversion will loose animations and transparency, but this is of much less concern. Crafted images may contain arbitrary runnable code on the client side.