重写 :（推荐学习：PHP编程从入门到精通）
子类继承父类, 定义和父类名称, 参数列表 完全一致的函数, 新的函数会覆盖旧的方法
<?php
class human{
public function say($name){
echo $name,' 吃了吗?<br />';
}
}
class stu extends human{
public function say(){
echo '切克闹,卡猫百比<br />';
}
/*
public function say($a,$b,$c){
echo '哥仨好';
}
报错:
Fatal error: Cannot redeclare stu::say() in D:\wamp\www\php\61.php on line 28
在PHP中,不允许存在多个同名方法,没有重载概念这一说。
*/
}
$li=new stu();
$li->say();
$li->say('binghui');// 上面这个过程叫重写override!重载:
同一个类中的多个方法具有相同的名字,但这些方法具有不同的参数列表,即参数的数量或参数类型不能完全相同
<?php
//在PHP中模拟重载的方法
class Calc {
public function area() {
// 判断一个调用area时,得到的参数个数
$args = func_get_args();
if(count($args) == 1) {
return 3.14 * $args[0] * $args[0];
} else if(count($args) == 2) {
return $args[0] * $args[1];
} else {
return '未知图形';
}
}
}
$calc = new Calc();
// 计算圆的页面
echo $calc->area(10),'<br />';
// 计算矩形的面积
echo $calc->area(5,8);
?>联系 && 区别:
方法的重载和重写都是实现多态的方式，区别在于前者实现的是编译时的多态性，而后者实现的是运行时的多态性
重载发生在一个类中，同名的方法如果有不同的参数列表（参数类型不同、参数个数不同或者二者都不同）则视为重载；重写发生在子类与父类之间，重写要求子类被重写方法与父类被重写方法和相同的参数列表
重载对返回类型没有特殊的要求，不能根据返回类型进行区分
php不支持重载，若要实现类似功能使用 Trait 机制
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