Basic structure of PHP functions

php function is particularly commonly used and is easy to reuse and maintain multiple times, so you must understand the basic structure of php function and master php FunctionIt is much simpler to understand the deeper things after the basic structure

The structure of PHP function

Construct a function

function get_sum($a,$b){ 
 $c = $a+$b;  
 return $c;
 }
 $sum = get_sum(3,5) //调用echo $sum; //输出

The basic structure of building a function

• Keyword: function

• Function name: get_sum

• Parameters: ($a,$b)

• Function body: { $c = $a+$b }

• Return value: return $c

Function naming rules:

Valid functions must start with letters Or start with an underscore, and can be followed by letters, numbers, or underscores.

The return value of the function:

Definition

• Value passed The return statement returns

• can return any type

• The return statement will immediately terminate the running of the function and transfer control to the calling function Lines of code

Functions are essential knowledge points in PHP. You must master

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