return在这里到底返回了啥
private static function cp(){ //合法性验证
//var_dump($_SERVER);
echo $_SERVER['HTTP_HOST'];exit;
if (self::CPURL == '') return;
这句中return反回了啥也没有写。挺怪的,是反回false啊,还是反回true呢,还是说一个啥值 ,没有表明呢
回复讨论(解决方案)
return 没有具体的值时,将返回 NULL
这里只是为了结束函数的执行
return 没有具体的值时,将返回 NULL
这里只是为了结束函数的执行
那么问题来了,不用不行吗,假如不用,按你说的可以出现以下后果,1,函数没有结束2,如果返回NULL,那么你这个函数怎么执行都是NULL,那这个函数和没有有啥区别呢。况且很多函数都是没有return的,这里不用它不行吗
你只是从本来就不多的代码中抽取了一句
而任何语法成分,离开了语境就什么都不是了
if (self::CPURL == '') return;
echo 'abc';
这样就可说明 return 的目的了
当然,你写成这样也是可以的
if (self::CPURL == '') {
}else {
echo 'abc';
}
为什么不可以中途下车呢
你只是从本来就不多的代码中抽取了一句
而任何语法成分,离开了语境就什么都不是了
if (self::CPURL == '') return;
echo 'abc';
这样就可说明 return 的目的了
当然,你写成这样也是可以的
if (self::CPURL == '') {
}else {
echo 'abc';
}
为什么不可以中途下车呢
回答的还不是很理想,只答出了点皮毛
下面才是正宗的解释
首先,它的意思就是返回;return()是语言结构而不是函数,仅在参数包含表达式时才需要用括号将其括起来。当返回一个变量时通常不用括号,这样可以降低PHP的负担。
基本用法:
a)、return expression // 返回一个表达式结果
b)、return(expr) // 函数表达式
c)、return // 直接返回,或返回空值
注意:最好不要用return($val)这种方式。
1、如果执行了return,则return 语句后面的内容将不会被执行了;

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Laravel's service container and service providers are fundamental to its architecture. This article explores service containers, details service provider creation, registration, and demonstrates practical usage with examples. We'll begin with an ove

PHP logging is essential for monitoring and debugging web applications, as well as capturing critical events, errors, and runtime behavior. It provides valuable insights into system performance, helps identify issues, and supports faster troubleshoot

Article discusses late static binding (LSB) in PHP, introduced in PHP 5.3, allowing runtime resolution of static method calls for more flexible inheritance.Main issue: LSB vs. traditional polymorphism; LSB's practical applications and potential perfo

The article discusses adding custom functionality to frameworks, focusing on understanding architecture, identifying extension points, and best practices for integration and debugging.
