Both the languages has differnt perspective, different requirement, its not the question of which one is better it aill depend on wat type of application you are planning to make

Here's a few difference:

PHP :  easier to deploy, because most web stuff already has it;
Python’s : better for desktop apps, PHP is really bad for that.

PHP is universally recognised as the default solution for web development. Python is not and this makes it harder to get Python recognised as a valid language for a web project.

Python is just as good for writing desktop software, web application backend, web application front-end, administration scripts, data-mining applications, high-performance networking libraries and the list goes on and on… Python is still an interpreted language and therefore may not perform as well in some situations as its compiled alternatives. Python probably wins on RESTful APIs, better HTTP libraries, better Character encoding handling, better socket libraries. Writing this stuff in PHP is tedious and fraught with difficulty. Python just looks cleaner for building such applications.

Its better to use php for small frond end reealted application (few 4-5 pages), python is good for big applications