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Classes and objects in PHP: Detailed graphic explanation of static attributes and static methods
Classes and objects in PHP: Detailed graphic explanation of static attributes and static methods
这篇文章主要介绍了php中类和对象：静态属性、静态方法,需要的朋友可以参考下
在PHP中，使用关键字 static 修饰成员属性和成员方法被称为静态属性和静态方法。静态属性和静态方法不需要在类被实例化的情况下可以直接使用。
静态属性
与普通的成员属性不同，静态属性属于类本身而不属于类的任何实例。静态属性可以被看做是存储在类当中的全局变量，可以在任何地方通过类来访问它们。
由于静态属性不受任何具体对象的限制，所以不需要建立类实例，而可以直接引用类中的静态属性，使用语法格式如下：
类名称::$静态属性名称
其中，符号”::”被称作范围解析操作符，它可以用于访问静态成员、静态方法和常量，还可以用于覆盖类中的成员和方法。
如果想在同一类的成员方法中访问静态属性，可以通过在该静态属性的名称前加上操作符”self::”来实现。例子如下：
class DaBing{
static $bing=0; //定义静态属性 bing
function addOne(){
self::$bing++; //调用同一类中的静态属性 bing
echo"\$bing的值为：".self::$bing++;
}
}
$obj=new DaBing();
$obj->addOne();该程序使静态属性的值加1，执行结果为：1
静态方法
在PHP中将成员方法声明为静态，就称其为静态方法。由于静态方法不受任何具体对象的限制，所以不需要建立类实例就可以直接引用类中的方法。语法格式如下：
类名称::静态方法名称（[参数1，参数2，……]）
与调用静态属性相同，在类中使用操作符”self::”来表示调用同一类中的静态方法，例子如下：
class DaBing{
static function addOne($number){ //定义静态方法 addOne()
echo"\$number+1=";
echo $number+1;
}
static function showResult($number){
echo"\$number=".$number;
echo"<br>";
self::addOne($number); //调用同一类中的静态方法 addOne()
}
}
$number=100;
DaBing::showResult($number);该程序执行的结果为：
$number=100
$number+1=101
以上就是本文的全部内容，希望对大家的学习有所帮助。
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