PHP Magic Constants

PHP

Michael Zippo

Magic constants:Magic constants - these are predefined constants in PHP that are used based on their usage. These constants are created by various extensions. There are nine magic constants in PHP, and all constants are resolved at compile time, as opposed to a regular constant that is resolved at runtime. There are eight magic constants that start and end with double underscores (__).
All constants are listed below with sample code:

__line__:this magic constant returns the current line number of a file. If you use this magic constant in your program file, then this constant will display the line number at compile time. Syntax:
```
.__line__
```
Example :echo "The Line number is:" . __ line__ ; ?> Output:The Line number is: 3

 __file__:this magic constant returns the full path to the executable with filename. Syntax: .__ file__ 
 Example :      < ? php  echo  "The file name is:" .  __ file__ ;  
 ?> Output:The file name is: /home/3d27a639c57aaed9efa5880e613bc273.php 
 __dir__:this magic constant returns the directory of the executable. Syntax: .__ dir__ 
 Example :      < ? php  echo  "The directory is:" . __dir__;  
 ?> Output:The directory is: / home 
 __function__:this magic constant returns the name of the function that contains this magic constant. Syntax: .__ function__ 
 Example :        function  Geeks() {   echo  "The function name is:" .  __ function__ ; } 
  Geeks(); 
 ?> Output:The function name is: Geeks 
 __class__:this magic constant returns the name of the class that this magic constant belongs to . Syntax:__class__
 Example :        class  Geeks {   public  function  getClassName() {   return  __ class__ ;  } }  $obj  =  new  Geeks();  echo  $obj  -> getClassName(); ?> Output:Geeks 
 __method__:this magic constant returns the name of the method that this magic constant is included in. Syntax: __method__ 
 Example :      class  Company  {   public  function  GeeksforGeeks() {   return  __ method__ ;  } }  $obj  =  new  Company();  echo  $obj  -> GeeksforGeeks(); ?> Output:Company::GeeksforGeeks 
 __namespace__:this magic constant returns the current namespace this magic constant belongs to. Syntax: __namespace__ 
 Example :       namespace  GeeksforGeeks;  class  Company {   public  function  gfg() {   return  __ namespace__;  } }  $obj  =  new  Company();  echo  $obj  -> gfg();  
 ?> Output:GeeksforGeeks 
 __trait__:this magic constant returns the trait name where this magic constant is enabled. Syntax:__trait__
 Example :        trait  GeeksforGeeks {   function  gfg() {   echo  __ trait__;  }  }   class  Company {   use  GeeksforGeeks;  }   $a  =  new  Company;   $a  -> gfg(); ?> Output:GeeksforGeeks 
 ClassName::class:this magic constant returns the fully qualified class name. Syntax:ClassName::class 
 Example :      namespace  Computer_Sciecnec_Portal ;  class  Geeks {}  echo  Geeks ::  class ;  // Classname::class 
 ?> Output:Computer_Sciecnec_PortalGeeks

Link: https://www.php.net/manual/en/language.constants.predefined.php

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PHP Magic Constants

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