What is the usage of php new
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.
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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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