PHP is a scripting language for interpretation and execution. Its grammar is similar to that of C language, and it is easy to learn and use. Non-professionals who don't know computers can use PHP with a little study. Java should be compiled into a class file first, and then executed on a Java virtual machine. Java development needs to be familiar with Java syntax and some core architectures, so as to realize a reusable and cross-platform software. Java learning is much more difficult than PHP learning.

Application comparison:

PHP is suitable for the rapid development of small and medium-sized application systems, with low development cost and quick response to changing requirements. Java is suitable for developing large-scale application systems, with broad application prospects, easy maintenance and good reusability. Also, a system with the same function developed in Java is more expensive than a system developed in PHP.

The development and application of these two technologies are impressive. The key is to see which technology you are more interested in. Interest is the motivation of learning.