


Detailed explanation of usage examples of object-oriented class constants in PHP
This article mainly introduces PHP object-oriented programming and the like constants usage, which is a very important concept in PHP object-oriented programming, for PHP beginners It is even more necessary to have a firm grasp of it. Friends who need it can refer to
Class constants are a very important concept in PHP object-oriented programming. A firm grasp of class constants will help further improve the efficiency of PHP object-oriented programming. level. This article describes the usage of class constants in PHP programming in the form of examples. The details are as follows:
Class constants: In the class, data that remains unchanged during the running cycle is saved.
Definition:
const 关键字 const 常量名 = 常量值
Examples are as follows:
class Student { public $stu_id; public $stu_name; public $stu_gender; const GENDER_MALE= '男'; const GENDER_FEMALE = '女'; }
Class constants are not restricted by access qualification modifiers
Access methods:
Class::Constant name
The example is as follows:
class Student { public $stu_id; public $stu_name; public $stu_gender; const GENDER_MALE= '男'; const GENDER_FEMALE = '女'; public function construct($id,$name,$gender='') { $this->stu_id= $id; $this->stu_name= $name; $this->gender= ($gender == ' ')?self::GENDER_MALE : $gender; } }
Summary: The members that can be defined in the class are: constant, staticAttributes, non-static properties, static methods, non-static methods.
Note here:
$this represents the current object, so does it always represent the object of the class where $this belongs?
the answer is negative! Because the value of $this does not depend on the class where $this is located, but depends on the execution object (execution environment) when the method where $this is located is called.
The execution environment of the method, which object the current method is in When executed in an environment, $this in the method indicates which object.
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