What are the implementation methods of compiler optimization in PHP7.0?

For PHP developers, optimization is an important task, because optimization can improve the performance and response speed of scripts and make the site run more smoothly. In recent years, with the continuous development of the PHP language, new implementation methods of compiler optimization in PHP7.0 version have also emerged. This article will introduce the implementation methods of compiler optimization in PHP7.0.

1. Zend engine optimization

Zend engine optimization in PHP7.0 is mainly reflected in three aspects:

1. Improvement of hash table

In PHP7.0, the structure of the hash table has been reconstructed to make memory usage more efficient. In the new structure, only one value is stored in each hash bucket, which allows the hash table in PHP7.0 to locate data faster. In addition, the new hash table structure can also quickly locate data by skipping empty buckets.

2. Optimization of function calls

Generally, function calls will cause some additional overhead, such as the pushing and restoring of the function call stack and the passing of parameters. PHP7.0 introduces the new Zend_CALL_INFO structure, which avoids the increase in function call overhead by storing the name and parameters of the function in a structure. In addition, Zend Engine has optimized the performance of function calls, which makes function calls faster than before.

3. Type coercion

In PHP7.0, coercion of integers and floating point numbers will become faster and more efficient. Because in the new version, ZendVM will use a more optimized algorithm to implement type conversion. This will also help improve performance and responsiveness.

2. JIT optimization

PHP7.0 uses a just-in-time compiler (JIT), which can compile PHP code into local machine code. This means that code execution will be faster since there is no need to parse and execute the code as before. In addition, JIT can optimize the code at runtime to increase execution speed and optimize CPU usage.

3. Optimized memory allocator

The memory allocator of PHP7.0 has been optimized, and it can manage memory allocation and release more efficiently. The new memory manager uses new algorithms and data structures, which allow it to more accurately predict memory allocation needs and free memory no longer needed more quickly. This will help the script run faster and reduce memory usage.

4. Code optimization

The code optimization of PHP7.0 has also been improved. For example, accessing an array element using its key name is more efficient than using a numeric index because it avoids multiple hash function calls. Additionally, reusing variables avoids unnecessary memory allocations and deallocations. Therefore, when using variables, you should try to avoid creating and destroying variables.

Summary

It is worth noting that the compiler optimization of PHP7.0 is not just a simple combination of the above implementation methods, but also includes management code and optimal memory allocation strategies. . In order to achieve optimal performance and the fastest response speed, we should continue to learn and explore the compiler optimization methods of PHP7.0 and apply them in actual projects.

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