The basis of php function and the example Analysis of passing parameters

This article introduces the relevant knowledge of "the basis of php function and case analysis of passing parameters". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

I. the basis of the function

Php provides a large number of functions and allows users to customize functions. The example code of php function definition is as follows:

The copy code is as follows:

Once a function is defined, it can be used anywhere.

2. Function parameters

The parameters of the php function are declared and defined when the function is defined, and the function can have any number of parameters. The most common transfer method is passed by value, or relatively few are applied by reference and default parameter values. The example code is as follows:

The copy code is as follows:

Generally, the value passed will not change due to internal changes in the function, unless it is a global variable or a reference. Let's take a look at the php function reference example. The code is as follows:

The copy code is as follows:

Global variable, the code is as follows:

The copy code is as follows:

This is the end of the introduction of "the basis of php function and the example analysis of passing parameters". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!