Detailed Explanation of Magic Constants in PHP

Detailed Explanation of Magic Constants in PHP

This paper introduces the magic constants in php programming. Mastering and flexibly applying these methods and constants is of great help to improve the programming level of php. Friends in need refer to study.

Magic Constant:

namespace ns1; 
class Test { 
  function __construct() { 
    var_dump(__LINE__); 
    var_dump(__FILE__); 
    var_dump(__DIR__); 
    var_dump(__FUNCTION__); 
    var_dump(__CLASS__); 
    var_dump(__METHOD__); 
    var_dump(__NAMESPACE__); 
  } 
} 
new Test(); 

Running result

int 5
string 'E:\wamp\www\a.php' (length=17)
string 'E:\wamp\www' (length=11)
string '__construct' (length=11)
string 'ns1\Test' (length=8)
string 'ns1\Test::__construct' (length=21)
string 'ns1' (length=3)

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