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? ??? ?? PHP ???? PHP ?????? ????? ???? ???? ?? ???? ?? ??? ??

PHP ?????? ????? ???? ???? ?? ???? ?? ??? ??

Jul 10, 2017 am 11:46 AM
php ??? ??

1.construct()

?????? ??? ???? ?????. Construct? ????? ???? ?? Construct? ??? ??? ???? ??? ??? ???? ?? ? ?????.

??? ??? ?? ??? ?? ??? ?? ??? ??????.

2.destruct()

? ??? ????? ?? ??? ??? ? ?????.

3.call()

??? ???? ?????. ???? ???? ???

4.get()

? ???? ??????. ?? ??? ?????. ?? ??? ?????

5.set()

?? ??? ? ?????. ?? ?? ??? private

6.toString()

??? ??? ? ?????.

7.clone()

? ??? ?? ??? ??? ? ?????. $a=new test(); $a1=clone $a;

8.sleep()

Serialize? ??? ??? ?? ?? ?? ?, ??? ?? ? ??? ???? ?? ? ??? ? ????.

9.wakeup()

? ?? ?? ??? ??? ???? ?? Unserialize ?? ?????.

10.isset()

??? ??? ????? ?????. ??? ??? ???? ?? ?????.

11.unset()

?? ??? ??? ? ??? ?? ??? private?? ?????.

12.set_state()

var_export? ??? ? ?????. var_export? ?? ??? set_state? ?? ?? ?????.

13.autoload()

??? ?????? ? ?? ???? ??? ? ???? ?????.


?? ?????? PHP ?? ???? ???? ???? ??? ??? ?? ??? ?????. ????? ? ??? ????? ?? ???? ???? ????? ???? ???. ???? ?? ???????

?? ?? PHP 2?? ????? ???? ??????. Final? ???? ???? ??? ? ????.

??:

final? ??? ???? ?? ????? ??? ? ???? final? ??? ???? ?? ????? ???? ? ????.

??? ?? ? ??? ??? ???? ? ?????. ?????? final

<?php
//final修飾的類不能被繼承
final class Person{
  var $name;
  var $age;
  var $sex;

  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function fun1(){
    echo $this->name;
  }
}

//Student類繼承類用final修飾的Person類,所以會報錯
class Student extends Person{
}

$stu=new Student("zs",20,"nan");

$stu->fun1();
?>

static(?? ???)

1? ???? ?? ??? ?????. ? ?? ???? ??

2. static?? ??? ?? ??? ??? ????? ??? ? ????. ?? ??? ?????

3. ?? ???? ???? ??? ????? ?????(?? ???? ???). . ?? ???? ???? ?? ??? ? ???? ???? ??? ?????. ???? ??? ? ??? ?????? ?? ?????

5. ???? ?????. ? ???? ?????? ???? ?(? ??? ??? ?????)6. ?? ???(?? ?? ???)? ??? ??? ???? ? ????(?? ??? ??? ????? ???? ? ????)???? ??? ??? ??? ???? ????? ???. ?? ??? ?????? $this? ??? ?? ??? ??? ???? $this? ??? ??? ? ????. ??

??? ??? ???? ???? ???? ???? ?? ? ???? ?? ???? ??? ? ????

??: ?? ??? ??? ??? ???? ????? ??

?? ??

? ???? ?? ??? ?????. ?? ???? ???? ??

??? ?? ::?? ??

????? ?? ??? ???? ?? self? ???? ???? ??? ? ????

const

1 ?? ??? ??? ? ????. 2. ????? ?? ??? ????? const? ?????

3. ??? ??? ?? ?? ??? ?????(??? ????? ??? ??::??? ???? ??? ????? self::constant? ?????)

4. ?? ? ??? ??

<?php
//定義一個類“人們”
class Person{
  protected $name;
  protected $age;
  protected $sex;
  static $country="中國";
  //聲明一個常量
  const RUN="走";

  //構(gòu)造方法
  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function getCountry(){
    //如果在類中使用靜態(tài)成員,可以使用self代表本類
    return self::$country;
  }

  function say(){
    echo "我的名字:{$this->name},我的年齡:{$this->age},我的性別:{$this->sex}。<br>";
  }

  protected function eat(){
    echo "吃飯!<br>";
  }

  function run(){
    //在類的內(nèi)部使用常量 self::常量
    echo self::RUN."<br>";
  }

  //聲明靜態(tài)的方法
  static function hello(){
    echo "你好<br>";
  }
}

PHP ?????? ?? ???? ?? ???

call()

?? : ??? ???? ?? ???? ??? ? , ??? ??? ??? ? ????? ?????.

?? ?? ??: ??? ???? ?? ???? ??? ? ???? ?????.???? ?? ?? ?? ??? ?????.? ????? ? ?? ????? ?????.

<?php
//定義一個類“人們”
class Person{
  protected $name;
  protected $age;
  protected $sex;
  static $country="中國";
  //聲明一個常量
  const RUN="走";

  //構(gòu)造方法
  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function getCountry(){
    //如果在類中使用靜態(tài)成員,可以使用self代表本類
    return self::$country;
  }

  function say(){
    echo "我的名字:{$this->name},我的年齡:{$this->age},我的性別:{$this->sex}。<br>";
  }

  protected function eat(){
    echo "吃飯!<br>";
  }

  function run(){
    //在類的內(nèi)部使用常量 self::常量
    echo self::RUN."<br>";
  }

  //處理一些不存在的錯誤調(diào)用
  //就會在調(diào)用一個對象中不存在的方法時就會自動調(diào)用
  function call($methodName,$args){
    //$methodName調(diào)用不存在方法的方法名 $args里面的參數(shù)
    echo "你調(diào)用的方法{$methodName}(參數(shù):";
    print_r($args);
    echo ")不存在<br>";
  }

  //聲明靜態(tài)的方法
  static function hello(){
    echo "你好<br>";
  }
}

$p=new Person("張三",20,"女");

$p->test(10,20,30);
$p->demo("aa","bb");
$p->say();
?>

toString()

?? ??? ?? ??? ? ?? ??, ??? ??? ??? ?? ?? ?? ??

<?php
//定義一個類“人們”
class Person{
  protected $name;
  protected $age;
  protected $sex;
  static $country="中國";
  //聲明一個常量
  const RUN="走";

  //構(gòu)造方法
  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function say(){
    echo "我的名字:{$this->name},我的年齡:{$this->age},我的性別:{$this->sex}。<br>";
  }

  function toString(){
    return self::$country."<br>{$this->name}<br>{$this->age}<br>{$this->sex}<br>".self::RUN;
  }
}

$p=new Person("張三",21,"女");
echo $p;
?>

clone()

Clone ??? clone()? ???? ??Original(?? ??) Copy( ??? ??)

clone()? ??? ??? ? ???? ???? ??????

??? ?????? ??? ??? ??? ??? ?? ??? ??? constuct? ?????.

在clone()方法中的$this關(guān)鍵字代表的是復(fù)本的對象,$that代表原本對象

<?php
//定義一個類“人們”
class Person{
  var $name;
  protected $age;
  protected $sex;
  static $country="中國";
  //聲明一個常量
  const RUN="走";

  //構(gòu)造方法
  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function say(){
    echo "我的名字:{$this->name},我的年齡:{$this->age},我的性別:{$this->sex}。<br>";
  }

  function clone(){
    $this->name="王五";
    $this->age=18;
    $this->sex="男";
  }

  function destruct(){
    echo $this->name."<br>";
  }
}

$p=new Person("張三",21,"女");
$p->say();
//這并不能叫做克隆對象,因為在析構(gòu)時只析構(gòu)一次
/*$p1=$p;
$p1->name="李四";
$p1->say();*/

$p1= clone $p;
$p1->say();
?>

autoload()

注意:其它的魔術(shù)方法都是在類中添加起作用,這是唯一一個不在類中添加的方法

只要在頁面中使用到一個類,只要用到類名,就會自動將這個類名傳給這個參數(shù)

<?php
function autoload($className){
  include "./test/".$className.".class.php";
}

  $o=new One;
  $o->fun1();  

  $t=new Two;
  $t->fun2();

  $h=new Three;
  $h->fun3();

?>

test里的文件

one.class.php

<?php
class One{
  function fun1(){
    echo "The Class One<br>";
  }
}
?>

two.class.php

<?php
class Two{
  function fun2(){
    echo "The Class Two<br>";
  }
}
?>

three.class.php

<?php
class Three{
  function fun3(){
    echo "The Class Three<br>";
  }
}
?>

對象串行化(序列化):將一個對象轉(zhuǎn)為二進制串(對象是存儲在內(nèi)存中的,容易釋放)

使用時間:

1.將對象長時間存儲在數(shù)據(jù)庫或文件中時

2.將對象在多個PHP文件中傳輸時

serialize(); 參數(shù)是一個對象,返回來的就是串行化后的二進制串

unserialize(); 參數(shù)就是對象的二進制串,返回來的就是新生成的對象

sleep()

是在序列化時調(diào)用的方法

作用:就是可以將一個對象部分串行化

只要這個方法中返回一個數(shù)組,數(shù)組中有幾個成員屬性就序列化幾個成員屬性,如果不加這個方法,則所有成員都被序列化

wakeup()

是在反序列化時調(diào)用的方法

也是對象重新誕生的過程

<?php
//定義一個類“人們”
class Person{
  var $name;
  protected $age;
  protected $sex;
  static $country="中國";
  //聲明一個常量
  const RUN="走";

  //構(gòu)造方法
  function construct($name,$age,$sex){
    $this->name=$name;
    $this->age=$age;
    $this->sex=$sex;
  }

  function say(){
    echo "我的名字:{$this->name},我的年齡:{$this->age},我的性別:{$this->sex}。<br>";
  }

  function clone(){
    $this->name="王五";
    $this->age=18;
    $this->sex="男";
  }

  //是在序列化時調(diào)用的方法,可以部分串行化對象
  function sleep(){
    return array("name","age");
  }

  //是在反序列化時調(diào)用的方法,也是對象重新誕生的過程??梢愿淖兝锩娴闹?
  function wakeup(){
    $this->name="sanzhang";
    $this->age=$this->age+1;
  }

  function destruct(){

  }
}
?>

read.php

<?php
  require "11.php";
  
  $str=file_get_contents("mess.txt");
  $p=unserialize($str);

  echo $p->say();
?>

write.php

<?php
  require "11.php";

  $p=new Person("張三",18,"男");

  $str=serialize($p);

  file_put_contents("mess.txt",$str);
?>

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