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php中双冒号::的用法

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简介双冒号操作符即作用域限定操作符Scope Resolution Operator可以访问静态、const和类中重写的属性与方法。在类定义外使用的话，使用类名调...

双冒号操作符即作用域限定操作符Scope Resolution Operator可以访问静态、const和类中重写的属性与方法。

在类定义外使用的话，使用类名调用。在PHP 5.3.0，可以使用变量代替类名。

Program List：用变量在类定义外部访问

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<?php
class Fruit {
    const CONST_VALUE = 'Fruit Color';
}
 
$classname = 'Fruit';
echo $classname::CONST_VALUE; // As of PHP 5.3.0
 
echo Fruit::CONST_VALUE;
?>

Program List：在类定义外部使用::

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<?php
class Fruit {
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