本文章来总结介绍关于php中global static和$GLOBALS使用与区别有需要了解他们三区别的朋友可参考参考.
1.global在整个页面起作用.
实例代码如下:
- global $var1,$var2;
就是外部变量的同名引用,变量本身的作用范围仍然在函数体内.改变这些变量的值,外部的同名变量自然也改变.但一旦用了&,那么变量将不再是同名引用.
实例代码如下:
- <?php
- $var1 = 1;$var2 = 2;
- function test(){
- global $var1,$var2;
- // 作用范围在函数体内
- $var1 = 3;}
- test();
- echo $var1;
- ?>
结果是 3.
因为是同名引用,在函数体内定义的PHP Global变量,函数体外可以使用,在函数体外定义的global变量不能在函数体内使用,
实例代码如下:
- $glpbal $a; $a=123; function f() { echo $a; //错误, }
再看看下面一例
实例代码如下:
- function f() { global $a; $a=123; } f(); echo $a; //正确,可以使用
2.static只在function和class内起作用.
global和$GLOBALS使用基本相同,但在实际开发中大不相同.global在函数产生一个指向函数外部变量的别名变量,而不是真正的函数外部变量,一但改变了别名变量的指向地址,就会发生一些意料不到情况,
实例代码如下:
- <?php
- /*
- *author:ajax123
- *qq:283400245
- */
- class person{
- static$name="ajax123";//static声明静态属性
- static$age=25;//static声明静态属性
- static$address="北京";//static声明静态属性
- function song(){
- echo "My name is : ".self::$name."<br>";//类内部:通过通过self 类访问静态属性
- echo "I am ".self::$age."<br>";//类内部:通过通过self 类访问静态属性
- echo "I live in ".self::$address."<br>";//类内部:通过self 类访问静态属性
- }
- }
- echoperson::$name."<br>";//类外部:通过类名person访问静态属性
- echoperson::$age."<br>";//类外部:通过类名person访问静态属性
- echoperson::$address."<br>";//类外部:通过类名person访问静态属性
- ?>
$GLOBALS[]确确实实调用是外部的变量,函数内外会始终保持一致Example #1 $GLOBALS 范例
实例代码如下:
- <?php
- function test() {
- $foo = "local variable";
- echo '$foo in global scope: ' . $GLOBALS["foo"] . "n";
- echo '$foo in current scope: ' . $foo . "n";
- }
- $foo = "Example content";
- test();
- ?>
以上例程的输出类似于:
$foo in global scope: Example content
$foo in current scope: local variable
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波比源码 » php中global static和$GLOBALS使用与区别
波比源码 » php中global static和$GLOBALS使用与区别
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