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This article mainly introduces the differences between php7 and php5, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

The difference between php7 and php5: 1. Php7 removes the SAPI;2 that is no longer supported, while php7 adds the null join operator; 3, php7 adds the union comparison operator; 4, php7 adds the return type declaration of the function.

This article operating environment: windows10 system, php 7&&php 5, thinkpad T480 computer.

I believe that there must be a lot of friends have such doubts, what is the difference between php5 and php7? What does php7 want to add or remove from php5?

Now I'm going to solve the mystery and see what's the difference between php 5 and php 7.

The difference between php5 and php7:

1. Performance improvement: the performance of PHP7 is twice higher than that of PHP5.0.

2. Many fatal mistakes in the past have now been changed to throw exceptions.

3. PHP 7.0removes some old SAPI (server-side application programming ports) and extensions that are no longer supported than PHP5.0.

4. PHP 7.0has a new null join operator than PHP5.0.

5. PHP 7.0adds a new combinatorial comparison operator than PHP5.0.

6. PHP 7.0has added the return type declaration of the function more than PHP5.0.

7. PHP 7.0has a new scalar type declaration than PHP5.0.

8. PHP 7.0adds anonymous classes more than PHP5.0.

9. Error handling and 64-bit support

If you understand the difference between errors and exceptions, you will know that it is not easy to handle fatal errors in PHP 5. PHP7 simplifies the process because it has replaced several major errors with exceptions that can be easily handled. This is achieved by introducing a new engine exception object.

As you may already know, PHP 5 does not support 64-bit integers or large files, but things have changed in PHP 7. PHP7 has 64-bit support, so you can also use native 64-bit integers as large files, so you can run your application perfectly on a 64-bit system architecture.

10. Declare the return type

In PHP 5, programmers cannot define the return type of a function or method. In real life, this is a huge disadvantage because programmers cannot prevent unexpected return types and generate exceptions in other cases.

Fortunately, PHP 7 allows programmers to declare the return type of a function based on the expected return value. This is sure to make the code robust and accurate. There are four different return types available-bool,int,string and float.

Why is the performance of PHP7 better than PHP5?

1. Variable storage bytes are reduced, memory consumption is reduced, and variable operation speed is improved.

2. The array structure is improved. Array elements and hash mapping table are allocated in the same memory, which reduces the memory footprint and improves the cpu cache hit rate.

3. The function calling mechanism is improved. By optimizing the link of parameter transmission, some instructions are reduced and the execution efficiency is improved.

Thank you for reading this article carefully. I hope the article "what's the difference between php7 and php5" shared by the editor will be helpful to you. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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