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What is the usage of php new

Aug 05, 2020 am 09:59 AM
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php new function is used to instantiate objects. The method of use is: first create a class, class attributes and class methods; then construct a custom function; finally instantiate the object through "new" and output Just use the methods and functions of the class.

What is the usage of php new

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php uses the New function to instantiate objects

Use NEW function to instantiate the object

 //new 对象名字 (参数)
 
 
  //创建一个类================================
   class  MyPC{       //建立类 MYPC
  //创建类属性
  public $name;        //定义全局 变量$name----类属性
  var $price;          //定义变量 $price ----类属性
  //创建类方法
  function vod(){   //构造自定义函数---类方法
  return"播放音乐"; //return表示子程序会返回一个值
  //如果不用返回,可以用 echo"播放音乐"; 这里输出的话  下面直接$pc1->name; 就能取  不需要ECHO
     }
 
  }
 
  //实例化对象  并输出类的方法 和功能============================
  $pc1=new MyPC(); 
   //把'类'实例化成'对象'$pc1  生成'对象' 才能访问(1)实现输出'方法'功能或者(2)输出'类'属性(-> 这个是访问'对象'中(1)类方法或(1)类属性
  
   //访问类属性变量$name  并输出
  $pc1->name="PHP";  //访问对象中类的属性中的变量值,并给他赋值(访问里面的不需要加$ 
  echo $pc1->name;   //输出-对象中类的属性中的变量值$name
 
  echo "<br>";
 
  //访问类方法--自定义函数vod()  并输出
  $pc1->vod();        //访问对象中类的方法---自定义函数vod()
  echo $pc1->vod();   //输出对象中类的方法---自定义函数vod()
 
 
  //类的属性  就是类中定义的变量名
  //类的方法  就是类中自定义函数
  //实例化对象  就是把类 变成对象  来实现 访问类中的 ,方法功能和属性
  //类中自定义一个函数   在类中自定义一个函数,那么这个自定义函数 就称为 类的方法 通过这个方法 在类实例化后,能实现输出某种功能
  //对象的功能扩展    对象通过 增加类.可以无限扩展 对象的功能
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