PHP Learning Note 4-class/Namespace/member Method/class method

Namespaces namespace Classes Class
Create file Hello.php,namespace is Jikexueyuan:

1<?PHP2 /**3 * Created by Phpstorm.4 * User:administrator5 * DATE:2015/6/286 * time:13:417  */8 //name Space9 namespace Jikexueyuan;Ten  One  A classHello { -      Public functionSayHello () { -         Echo' Hello jikexueyuan<br/> '; the     } -}

Re-create the file Hello.php,namespace is jkxy:

1<?PHP2 /**3 * Created by Phpstorm.4 * User:administrator5 * DATE:2015/6/286 * time:13:447  */8 //name Space9 namespace Jkxy;Ten  One  A classHello { -      Public functionSayHello () { -         Echo' Hello jkxy<br/> '; the     } -}

Create file index.php:

1<?PHP2 /**3 * Created by Phpstorm.4 * User:administrator5 * DATE:2015/6/286 * time:12:437  */8 Header("content-type:text/html; Charset=utf-8 ");9 require_once' jkxy/hello.php ';//require_once: Calling a fileTen require_once' Jikexueyuan/hello.php '; One  A $h=New\jkxy\hello ();//to create an instance of a class - $h->sayhello ();//accessing internal functionality through an instance -  the $d=New\jikexueyuan\hello (); - $d->sayhello ();

Invoking files jkxy/hello.php and jikexueyuan/hello.php with require_once , accessing the internal functionality of the class by instantiating the class

Construction method: Executes when an instance of the class is created

Create File man.php

1<?PHP2 /**3 * Created by Phpstorm.4 * User:administrator5 * DATE:2015/6/286 * time:13:567  */8 9 classMan {Ten  One     /** A * @param int $age age//type of parameters passed in - * @param string $name name -      */ the      Public function__construct ($age,$name){ - //Echo ' Construct a man '; -         $this->_age =$age;//log down through this -         $this->_name =$name; +         } -     } +      Public functionGetage () {//The outside world can access A         return $this-_age; at     } -  -      Public functionGetName () { -         return $this-_name; -     } -  in     Private $_age,$_name; -}

Used in index.php in the following ways:

1 require_once ' man.php '; 2 $m New Man ("Vito"); // is executed when an instance of the class is created 3 Echo $m-GetName (); 4 Echo $m->getage ();

Examples of member methods:

1  Public function getage () {// member Method 2         return$this-_age; 3     }

static methods/Static constants/Static variables add the following code to the man.php:

1  Public Static function Say_hello () {// static method: Mainly used to describe class properties 2         echo "Hello PHP"; 3     }4     privatestatic$NUM = 0;   static variable 5     const max_man_num = n;   Static Constants

To execute a static method in index.php:

1 Man::say_hello (); // executing a static method

Add code to man.php and use static and static constants in index.php:

1 man::$NUM+ +; // Add each time you create 2         if (Man::$NUM>man::max_man_num) {3             Throw New Exception ("Cannot create more"); 4         }

Using static variables and static constants in index.php

1  for ($i= 0; $i<Man::MAX_MAN_NUM; $i+ +) {2     new man ("Vito"); 3 }

PHP Learning Note 4-class/Namespace/member Method/class method