The key difference lies in how the code is executed:
Compiled Languages:
The source code is translated into machine code by a compiler.it's a sequence of instructions the computer's CPU can directly understand. This process happens before the program is executed. The resulting machine code is then executed directly by the CPU.
Translation: Translated into machine code before execution
Execution: Generally faster
Debugging: Can be more difficult as errors may not be immediately apparent.
Examples: C, C++, Java, Go
Interpreted Languages:
The source code is executed line by line by an interpreter. The interpreter reads each line, translates it into machine code, and then executes it immediately.
Translation: Translated and executed line by line
Execution: Generally slower
Examples: Python, JavaScript, PHP, Ruby
PHP: PHP is primarily an interpreted language.
However, some PHP engines (like the popular PHP-FPM) use techniques like "just-in-time" (JIT) compilation to improve performance. JIT compilers translate parts of the PHP code into machine code during execution, which can significantly speed up performance.
In essence:
- Compiled languages prioritize performance and efficiency, while interpreted languages prioritize ease of development and portability.
- The choice between a compiled and interpreted language depends on the specific needs of the project.