Constants for PHP Object Const definition Classes

Const

* The const-decorated class has a constant member property
* 1. Constants are recommended to use uppercase and cannot use $
* 2. Constants must be given a good initial value at the time of declaration
* 3. Constants are accessed in the same way as static, but are read-only
* Access class name outside class:: Constant Name
* Inside the class Access self:: constant name

<?phpheader (' Content-type:text/html;charset=utf-8 ');/* * define (' Constant name ', ' value ')  *  Class cannot be used define the member property of the definition  * const  adornment class is a constant  * 1. Constants are recommended to use uppercase, and $ * 2 cannot be used. Constants must be given a good initial value at the time of declaration  * 3. Constants are accessed in the same way as static, but can only be read  *  accessed outside the class         class name:: Constant Name  *  accessing        self within the class:: Constant name  *  * final    Classes and methods  * static  properties and Methods  */define (' ROOT ',  str_replace (' \ \ ',  '/',  dirname (_ _file__)));// \  is an escape character   so to represent a backslash   character, two backslashes are required, which means that the backslash is escaped with an escape character echo root;     class Person{        const NAME =  "Jin Sha Harbor";        static function say () {         echo  "I Am" .self::name;        }     }    perSon::say (); 

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Constants for PHP Object Const definition Classes