What is the use of php return

The purpose of this article is to share with you about the usage of php return. I think it is very practical, so I share it with you. I hope you can get something after reading this article. Let's take a look at it with the editor.

The use of php return: 1, through the "return expression" way to return an expression result; 2, through the "return (expr)" way to return the function expression; 3, through the return directly return or return null value.

The operating environment of this paper: Windows7 system, PHP7.1, Dell G3.

What is the use of php return?

An Analysis of the usage of return in php

First of all, it means return; return () is a language structure, not a function, and needs to be enclosed in parentheses only if the parameter contains an expression. Parentheses are usually not used when returning a variable, which reduces the burden on PHP.

Basic usage:

A), return expression / / returns an expression result

B), return (expr) / / function expression

C), return / / return directly, or return null

Note: it's best not to use return ($val).

1. If return is executed, the content after the return statement will not be executed

Function add ($a _ r _ r _ b) {return $a _ r _ r _ b; return $a _ r _ r _ b;} $c = add (5j _ 3); / / the resulting $c value can be used elsewhere in the program! Echo $c

Output: 8, only the execution of $astatb is not executed.

2. Return can be a function return value or a null value, depending on the specific usage, for example:

Function test ($a) {if ($a > 10) {return "a > 10";} else {return "a