Naming rules for php function names

Naming rules for php function names

Functions are functions. Encapsulate a piece of code that performs a specific function. Calling a function is calling a function. ,

Basic syntax format of function

function 函数名([参数1, 参数2, ……]){
    函数体……
}

function: Keywords that must be used when declaring a function

Function name: It must conform to the PHP identifier, and the function name is Unique, case-insensitive

[Parameter 1, Parameter 2...]: The value passed to the function from the outside world. It is optional. Use commas "," to separate multiple parameters.

Function body: The main body of the function definition, a code segment specifically used to implement specific functions.

Return value: You need to use the return keyword to pass the data that needs to be returned to the caller.

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