Hi..
I am going to create an E-commerce website for my textile shop. I would like to know what is the difference between creating an online store with PHP and Magento platform.
What is the difference between Magento and PHP in E-commerce Development?
Magento is a web application that is written in PHP, so it's a mostly meaningless question: the difference is whether a ready-made application like Magento fulfills all of your requirements, in which case it may be a good solution, or whether you need to build something yourself (in whatever programming language you and your team prefer, whether that's PHP or one of the many other choices).
An analogy to your question might be "what's the difference between the Iliad and the Greek language?" The Iliad was written in Greek. Likewise, Magento was written in PHP.