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 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) test里的文件 one.class.php two.class.php three.class.php 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 read.php write.php ? ??? PHP ?????? ????? ???? ???? ?? ???? ?? ??? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!<?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;
$p1->say();
?>
<?php
function autoload($className){
include "./test/".$className.".class.php";
}
$o=new One;
$o->fun1();
$t=new Two;
$t->fun2();
$h=new Three;
$h->fun3();
?>
<?php
class One{
function fun1(){
echo "The Class One<br>";
}
}
?>
<?php
class Two{
function fun2(){
echo "The Class Two<br>";
}
}
?>
<?php
class Three{
function fun3(){
echo "The Class Three<br>";
}
}
?>
<?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(){
}
}
?>
<?php
require "11.php";
$str=file_get_contents("mess.txt");
$p=unserialize($str);
echo $p->say();
?>
<?php
require "11.php";
$p=new Person("張三",18,"男");
$str=serialize($p);
file_put_contents("mess.txt",$str);
?>

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PHP?? ?? ?? ID? ?? ??? Session_id () ??? ???? ???? Session_Start ()? ???? ????? ??????. 1. ??? ????? ?? _start ()? ?????. 2. Session_id ()? ???? ?? ID? ?? ABC123DEF456GHI789? ??? ???? ?????. 3. ??? ?? ??? Session_Start ()? ??????, ???? ???? ?????? ?? ??? ?????? ??? ??????. 4. ?? ID? ??, ?? ?? ? ?? ?? ??? ??? ? ??? ?????? ???????. ??? ???? ????? ID? ????? ?? ? ??? ??????.

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PHP?? ?? ??? ?? ???? ????? ?? ??? ???? ???? ??? $ _session ? ??? ???? ????. 1. ? ???? ?? ??? ???? ?? Session_Start ()? ???? ???? ??? ???????. 2. $ _session [ 'username'] = 'johndoe'? ?? ?? ??? ?????. 3. ?? ????? session_start ()? ?? ? ? ??? ? ??? ?? ??? ???????. 4. Session_Start ()? ? ????? ???? ??? ????, ???? ?? ???? ??, ??? ?? ???? ??? ?? ? ? ??? ??????. 5. SES? ??????
