"What does the PHP version mean?" This problem is very common among people who have not been exposed to PHP programming. Simply put, PHP is an open source scripting language that can generate dynamic web content on the server side. PHP version refers to the version of PHP program used to write PHP code. The relationship between them can be simply understood as different versions of the same programming language, just like Windows system, there are 7, 8, 10 and other different versions.

Although PHP is an open source language with many versions, the differences in its stability and performance cannot be ignored. For example, the code compatibility of PHP5 version is good, but the speed is slow, while the performance of PHP7 version has been greatly improved compared with the previous version. Therefore, it is very important to choose a PHP version suitable for your own project and make a reasonable trade-off between performance and code compatibility.

Generally speaking, the choice of PHP version should be summarized in the actual needs of the project. For example, if the project needs to handle a large number of concurrent requests, you should choose a newer PHP version, such as PHP7. At the same time, before choosing a PHP version, you can also query some related blogs or technical forums to get some comments on performance and security, which is conducive to improving the quality and maintainability of the code.