PHP (11) Object-oriented instantiation of object through class

1. Instantiated objects       When a class is defined, we use the New keyword to generate an object.  $ Object name = new class name (), example:       [php]  <span style= "color: #333333;" ><?php   class person   { //below is the Member attribute   var $name;    //person's name       V AR $sex;      //man's sex   var $age;      //People's age  //below is the member method   function say ()//This person can speak the way   {  echo "This man is Talking";  } & nbsp function run ()//This person can walk the way   {  echo "This person is walking";  }  }   $p 1=new persons ();   $p 2=new person ();          ></span><span style= "color: #ff0000;" >      </span>     2. Accessing members   $p 1=new person () in an object;   How to use the members of the object? To access members of an object, you use a special operator "->" to complete the access of an object member, similar to the "." In Java.     Example:    [php]  <?php   class person   { //below is the Member attribute   var $name; &nbs P    //person's name   var $sex; &nbsP    //person sex   var $age;      //person's age  //below is the person's member method   function say ()///This person can speak the way   {  echo "This man is Talking";  }   function run ()//This person can walk the way   {  echo "This person is walking";  }  }   $p 1=new persons (); Create an Instance object $p1   $p 2=new person (); Create an Instance object $p2   $p 3=new person (); Create instance Object $P3  //The following three lines are assigned to $p1 object properties   $p 1->name= "John";   $p 1->sex= "male";   $p 1->age=20;  //The following three lines are access to $p1 object's properties   echo "P1 object's name is:". $p 1->name. " <br> ";   echo "The gender of the P1 object is:". $p 1->sex. " <br> ";   echo "The Age of the P1 object is:". $p 1->age. " <br> ";  //The following two lines access the methods in the $p1 object   $p 1->say ();       $p 1->run ();  //The following three lines are assigned to the $p2 object property   $p 2->name= "Dick";   $p 2->sex= "female";   $p 2->age=30;  //The following three lines are access to $p2 object's properties   echo "P2 object's name is:". $p 2->name. " <br> ";   echo "The gender of the P2 object is:". $p 2->sex. " <br> ";   echo "The Age of the P2 object is:". $p 2->age. " <br> ";  //BelowTwo rows accessing the methods in the $p2 object   $p 2->say ();   $p 2->run ();  //The following three lines are assigned to the $p3 object property   $p 3->name= "Harry";   $p 3->sex= "male";   $p 3->age=40;      //The following three lines are access to the properties of the $p3 object   echo "P3 object's name is:". $p 3->name. " <br> ";   echo "The gender of the P3 object is:". $p 3->sex. " <br> ";   echo "The age of the P3 object is:". $p 3->age. " <br> ";  //The following two lines access the methods in the $p3 object   $p 3->say ();   $p 3->run ();  ?>     3. Special reference to the use of "$this"   PHP provides me with a reference to this object $this, each object has an object in the reference $this to represent this object, to complete the call of the object's internal members, this is the meaning of "this", the above example, We instantiate three instance objects $p1, $P 2, $P 3, each of these three objects have a $this representing object $p1, $p 2, $p 3 respectively.    $this is the reference within an object that represents the object, in the same way that it is used within the object and the members of the calling object outside the object. $this-> Properties     $this->name;           $this->age;   $this->sex;               $this-> method   $this->say ();             $this->run ();     Example: [PHP]   <?php   classPerson   { //below is the Member attribute   var $name      //The name of the   var $sex;      //person's Gender   VAR $age;      //person's age  //below is the person's member method   function say ()///This person can speak the way   {     , echo "My name. Called: "$this->name." Sex: "$this->sex." My Age is: ". $this->age." <br> ";  }   function run ()//The way this person can walk   {  echo "This man is Walking";  }  }   $p 1=new person (); Create an Instance object $p1   $p 2=new person (); Create an Instance object $p2   $p 3=new person (); Create instance Object $P3  //The following three lines are assigned to $p1 object properties   $p 1->name= "John";   $p 1->sex= "male";   $p 1->age=20;  //below access to the $p1 object in the speech method   $p 1->say ();  //The following three lines are assigned to the $p2 object property   $p 2->name= "Dick";   $p 2->sex= "female";   $p 2->age=30;  //below access to the $p2 object in the speech method   $p 2->say ();  //The following three lines are assigned to the $p3 object property   $p 3->name= "Harry";   $p 3->sex= "male";   $p 3->age=40;  //below access to the $p3 object in the speech method   $p 3->say ();  ?>     Output: My name is: John Sex: Male My age is: 20 my name: Dick Sex: Female my age is: 30 my name: Harry Sex: Male My age is: