search
Homephp教程php手册PHP引用的调用方法分析,php引用调用

PHP引用的调用方法分析,php引用调用

本文实例讲述了PHP引用的调用方法。分享给大家供大家参考,具体如下:

示例1:

function test($arr){} 
echo test(&$arr); 

示例2:

function test(&$arr){} 
echo test($arr); 

示例1和2是一样的效果.

示例3:

function &test($arr){return $result;} 
echo &test($a);//有效 
echo test($a);//返回的是值,不是引用 

总结:只有定义方法时在方法名前加&和调用方法时在方法名前同时加上&时才返回引用.

示例4:

$a=$b; 

当$a与$b都不重新赋值时,即不发生写操作时,与$a=&$b是一样的,即相当于赋引用.

只有当$a或$b都发生变化时才会以拷贝的方式复制一份值赋于$a

希望本文所述对大家PHP程序设计有所帮助。

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

ZendStudio 13.5.1 Mac

ZendStudio 13.5.1 Mac

Powerful PHP integrated development environment

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function