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

<?php

class 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

<?php

require_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=parentName
child setAge() age=
child setLocal() local=child local
parent setHoby() hoby=parent hoby
Child[name=, age=20, local=child local, hoby=parent hoby]
Child[name=, age=20, local=child local, hoby=parent hoby]

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PHP class 继承

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