PHP License question

I currently developing a project that I wish to release under a, preferably, open-source and "copy-left" license. So, I'm taking a close look at the GNU GPL for this, and it seems to serve this purpose, well. However, I am aware that the PHP license conflicts with the GNU GPL, and, thus, anything released under the PHP license cannot also be released in software under the GPL. At least, this is my assumption. Now, to my question: if a PEAR package is released under the PHP license, and my product is under the GPL, can I include the PEAR package in my product? Under the above assumption, the answer would be no. So, what license should I release my product under to maintain it's copy-left status and yet still allow the PEAR packages to be included?