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10 recommended articles about the scope of variables

黄舟
黄舟Original
2017-06-11 09:29:051079browse

什么是全局变量?全局变量也称为外部变量,是在函数的外部定义的,它的作用域为从变量定义处开始,到这个程序文件的结尾。和其他编程语言不同,全局变量不是自动设置为可用的。上一章节我们介绍了php变量的范围的局部变量,在PHP中,由于函数可以视为单独的程序代码片段,所以局部变量会覆盖全局变量的能见度,因此在函数中无法直接调用全局变量。其代码如下所示的格式:

1. 关于PHP变量的详细介绍

10 recommended articles about the scope of variables

简介:什么是全局变量?全局变量也称为外部变量,是在函数的外部定义的,它的作用域为从变量定义处开始,到这个程序文件的结尾。和其他编程语言不同,全局变量不是自动设置为可用的。上一章节我们介绍了php变量的范围的局部变量,在PHP中,由于函数可以视为单独的程序代码片段,所以局部变量会覆盖全局变量的能见度,因此在函数中无法直接调用全局变量。其代码如下所示的格式:<?php $one ...

2. 什么是全局变量?php变量的范围之全局变量实例详解

10 recommended articles about the scope of variables

简介:全局变量也称为外部变量,是在函数的外部定义的,它的作用域为从变量定义处开始,到这个程序文件的结尾。

3. 什么是局部变量?php变量的范围之局部变量实例详解

10 recommended articles about the scope of variables

简介:变量的范围也就是它的生效范围。大部分的 PHP 变量只有一个单独的使用范围,也包含了 include 和 require 引入的文件。

4. php变量范围

10 recommended articles about the scope of variables

简介:变量的范围即它定义的上下文背景(也就是它的生效范围)。大部分的 PHP 变量只有一个单独的范围。这个单独的范围跨度同样包含了 include 和 require 引入的文件

5. PHP 中global 和$GLOBALS[]的使用和区别

10 recommended articles about the scope of variables

简介:变量的范围即它定义的上下文背景(也就是它的生效范围)。大部分的 PHP 变量只有一个单独的范围。这个单独的范围跨度同样包含了 include 和 require 引入的文件。例如:     <?php  $a = 1;  include 'b.inc';  ?>        这里变量 $a 将会在包含文件 b.inc 中生效。但是,在用户自定义函数中,一个局部函数范围将被引入。任何用 ...

6. php变量作用域详解(1/3)_PHP教程

简介:php变量作用域详解(1/3)。变量的范围即它定义的上下文背景(也就是它生效的范围)。大部分的 PHP 变量只有一个单独的范围。这个单独的范围跨度同样包含了 incl

7. 浅谈PHP变量作用域以及地址引用问题_PHP教程

Introduction: A brief discussion of PHP variable scope and address reference issues. The concept of scope: Variables can be declared anywhere in a PHP script. However, the location where a variable is declared will greatly affect the scope of access to the variable. This accessible range is called the scope

8. Detailed explanation of global variables in PHP_PHP tutorial

Introduction: Detailed explanation of global variables in PHP. This article will introduce in detail the method of global variable global in PHP. Friends who need to know how to use the global function can refer to this article. The scope of a variable is the context in which it is defined

9. php variable scope, reference, object reference, transfer_PHP tutorial

Introduction: PHP variable scope, reference, object reference, transfer. This article introduces the variable scope, reference, object reference, and transfer of PHP. Friends in need can refer to it. Variable scope The scope of a variable is the context in which it is defined (that is, its

10. Benniao learns PHP(5) Declaration and use of functions_PHP tutorial

Introduction: Benniao learns PHP (5) Declaration and use of functions. Benniao learns PHP (5) Declaration and use of functions 1. Declaration of functions 2. Scope of variables Local variables: Variables declared in a function are local variables and can only be used inside your own function


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