1. Syntax: One of the main differences between Java, PHP, and Python is their syntax. Java uses a statically-typed syntax where variable types must be declared explicitly, while PHP and Python use dynamically-typed syntax where variable types do not need to be specified. This difference can affect flexibility and ease of use in coding.

2. Performance: Another significant difference lies in the performance of these languages. Java is known for its high performance as it is compiled into bytecode and runs on the Java Virtual Machine (JVM). PHP, on the other hand, is interpreted and runs directly without compilation, which can make it slower in certain cases. Python also uses interpretation but has various implementations and optimizations that make it competitive in terms of performance.

3. Web Development: PHP is widely used for web development due to its built-in support for web-related tasks. It has extensive libraries and frameworks tailored specifically for web development, making it a popular choice for creating dynamic websites. While Java can also be used for web development, it requires the use of external libraries and frameworks. Python, although not as commonly used for web development as PHP, has growing popularity in this area, thanks to frameworks like Django and Flask.

4. Object-Oriented Programming (OOP): All three languages support object-oriented programming, but they have different approaches. Java enforces strict object-oriented principles, requiring objects to be encapsulated within classes. PHP initially had limited support for OOP but has since evolved and now fully supports OOP. Python, known for its simplicity, also supports OOP, but it allows for both procedural and object-oriented programming styles.

5. Community and Ecosystem: The size and diversity of the community and ecosystem around a programming language can significantly impact its popularity and support. Java has a large and well-established community with extensive documentation, libraries, and frameworks available. PHP also has a vibrant community, particularly with regards to web development, and multiple frameworks like Laravel and Symfony. Python has a large and active community as well, with a broad range of libraries and frameworks for various purposes, including data science and machine learning.

6. Ease of Learning: The ease of learning a programming language can be subjective, but some factors can influence it. Java has a steeper learning curve due to its strict syntax and object-oriented principles. PHP, with its simple and forgiving syntax, can be relatively easier for beginners. Python, often praised for its readability and simplicity, is considered one of the easiest programming languages to learn.

In Summary, Java, PHP, and Python differ in terms of syntax, performance, web development capabilities, object-oriented programming approaches, community and ecosystem support, and ease of learning. These differences make each language suitable for specific use cases and can greatly influence the choice of developers.