which one is better?
It really depends on the context and what you are trying to accomplish. Java is a general-purpose programming language that is class-based, object-oriented, and designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that code that runs on one platform does not need to be recompiled to run on another. PHP is a server-side scripting language designed for web development but also used as a general-purpose programming language. It is especially suited for web development because it can be embedded into HTML and generally runs on a web server.
In terms of performance, Java is generally faster and more efficient than PHP as it is a compiled language. However, PHP does have certain advantages over Java, such as its simplicity and ease of use. PHP is also more popular than Java, so there is a larger community of developers who can help with any issues you may encounter. Ultimately, the choice between Java and PHP depends on the specific needs of your project.