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PHP class 继承

作者：佚名      php网站开发编辑：admin      更新时间：2022-07-23
php class 继承

1.执行结果

成员名

成员修饰符

方法名

方法修饰符

执行结果

name

PRivate

setName

private

在构造函数函数中执行父类私有方法，子类未能覆盖private成员变量和方法，修改父类的私有变量

age

private

setAge

public

修饰符是public，子类方法覆盖父类方法，修改子类成员变量。但在父类构造其中执行$this->age只能取到父类的age

local

public

setLocal

public

子类的方法和成员变量均覆盖了父类对应方法和成员变量

hoby

public

setLocal

private

成员变量被覆盖，当是方法未覆盖

2.相关代码

ParentClass.php

<?phpclass ParentClass {    private $name;    private $age;    public $local;    public $hoby;    public function __construct() {        print "execute parent construct()<br/>";        $this->setName ();        echo ("name=" . $this->name . "<br/>");                $this->setAge ();        echo ("age=" . $this->age . "<br/>");                $this->setLocal ();        echo ("local=" . $this->local . "<br/>");                $this->setHoby ();        echo ("hoby=" . $this->hoby . "<br/>");        $this->__toString();    }    private function setName() {        $this->name = "parentName";        print "parent setName()\n ";    }    public function setAge() {        $this->age = 50;        print "parent setAge()\n";    }    public function setLocal() {        $this->local = "parent local";        print "parent setLocal()\n";    }    private function setHoby() {        $this->hoby = "parent hoby";        print "parent setHoby()\n";    }        public function __toString() {        echo ("Parent[name=" . $this->name . ", age=" . $this->age . ", local=" . $this->local . ", hoby=" . $this->hoby . "]<br>");    }}?>
ChildClass.php
<?phprequire_once 'ParentClass.php';class ChildClass extends ParentClass {    private $name;    private $age;    public $local;    public $hoby;    public function __construct() {        print "execute child construct()<br/>";        parent::__construct ();        echo $this->__toString();    }    private function setName() {        $this->name = "childName";        print "child setName()\n";    }    public function setAge() {        $this->age = 20;        print "child setAge()\n";    }    public function setLocal() {        $this->local = "child local";        print "child setLocal()\n";    }    private function setHoby() {        $this->hoby = "child hoby";        print "child setHoby()\n";    }    public function __toString() {        echo ("Child[name=" . $this->name . ", age=" . $this->age . ", local=" . $this->local . ", hoby=" . $this->hoby . "]<br/>");    }}$child = new ChildClass ();?>

3.执行输出

execute child construct()execute parent construct()parent setName() name=parentNamechild setAge() age=child setLocal() local=child localparent setHoby() hoby=parent hobyChild[name=, age=20, local=child local, hoby=parent hoby]Child[name=, age=20, local=child local, hoby=parent hoby]