{"id":1770,"date":"2021-06-23T22:56:31","date_gmt":"2021-06-23T19:56:31","guid":{"rendered":"https:\/\/www.etemkeskin.com\/?p=1770"},"modified":"2021-06-23T22:59:03","modified_gmt":"2021-06-23T19:59:03","slug":"magic-constants-in-php","status":"publish","type":"post","link":"https:\/\/www.etemkeskin.com\/index.php\/2021\/06\/23\/magic-constants-in-php\/","title":{"rendered":"Magic Constants in PHP"},"content":{"rendered":"\n

PHP<\/strong> has predefined constants that come with various extensions<\/strong>. Knowing these constants allows us to use PHP more effectively.<\/p>\n\n\n\n

1.) __LINE__<\/code><\/strong><\/h4>\n\n\n\n

Returns the line number where it is used.<\/p>\n\n\n\n

echo "Line number is : ". __LINE__;\n\n\/\/OUTPUT: Line number is : 2<\/pre><\/div>\n\n\n\n
2.) __FILE__<\/code><\/strong><\/h4>\n\n\n\n
Returns the file path and filename.<\/p>\n\n\n\n
echo "File path : ". __FILE__;\n\n\/\/OUTPUT: File path : C:\\Bitnami\\wampstack-7.3.25-0\\apache2\\htdocs\\learn-lara\\app\\Http\\Controllers\\FrontController.php<\/pre><\/div>\n\n\n\n
3.) __DIR__<\/code><\/strong><\/h4>\n\n\n\n
Returns the directory where the file is located.<\/p>\n\n\n\n
echo "Folder path : ". __FILE__;\n\n\/\/OUTPUT: Folder path : C:\\Bitnami\\wampstack-7.3.25-0\\apache2\\htdocs\\learn-lara\\app\\Http\\Controllers<\/pre><\/div>\n\n\n\n
4.) __FUNCTION__<\/code><\/strong><\/h4>\n\n\n\n
When used inside a function, it returns the name of the function it is in.<\/p>\n\n\n\n
public function myFunction()\n    {\n  \t\techo "Function name : ". __FUNCTION__;\n\t}\n\n\/\/OUTPUT: Function name : myFunction<\/pre><\/div>\n\n\n\n
5.) __CLASS__<\/code><\/strong><\/h4>\n\n\n\n
When used inside a class, it returns the name of the class it is in. It is also used in traits.<\/p>\n\n\n\n
class FooBar\n{\n    public function getClassName(){\n        return __CLASS__;\n    }\n}\n$obj = new FooBar();\necho $obj->getClassName();\n\n\/\/OUTPUT: FooBar<\/pre><\/div>\n\n\n\n
6.) __TRAIT__<\/code><\/strong><\/h4>\n\n\n\n
When used inside a trait, it returns the name of the trait it is in.<\/p>\n\n\n\n
trait FooBarTrait{  \n    function myTraitFunction(){  \n        echo __TRAIT__;  \n        }  \n    }  \n    class Student{  \n        use FooBarTrait;  \n        }  \n    $a = new Company;  \n    $a->myTraitFunction(); \n\n\/\/OUTPUT: FooBarTrait<\/pre><\/div>\n\n\n\n
7.) __METHOD__<\/code><\/strong><\/h4>\n\n\n\n
Returns the name of the method in which it is used.<\/p>\n\n\n\n
class Student\n{\n    public function myClassMethod(){\n        return __METHOD__;\n    }\n}\n$obj = new Student();\necho  $obj->myClassMethod();\n\n\/\/OUTPUT: myClassMethod<\/pre><\/div>\n\n\n\n
8.) __NAMESPACE__<\/code><\/strong><\/h4>\n\n\n\n
Returns the current namespace.<\/p>\n\n\n\n
namespace FooBarNamespace;\n  \nclass Student {\n    public function myMethod() {\n        return __NAMESPACE__;\n    }\n}\n  \n$obj = new Company();\necho  $obj->myMethod(); \n  \n\/\/OUTPUT: FooBarNamespace<\/pre><\/div>\n\n\n\n
9.) ClassName::class<\/code><\/strong><\/h4>\n\n\n\n
Returns the fully qualified class name in which it is used.<\/p>\n\n\n\n
namespace FooBarNamespace;\nclass Student{ }\n  \necho Geeks::class;\n\n\/\/OUTPUT: FooBarNamespace\\Student<\/pre><\/div>\n\n\n\n
Good luck…<\/p>\n","protected":false},"excerpt":{"rendered":"
PHP has predefined constants that come with various extensions. Knowing these constants allows us to use PHP more effectively. 1.) __LINE__ Returns the line number where it is used. 2.) __FILE__ Returns the file path and filename. 3.) __DIR__ Returns the directory where the file is located. 4.) __FUNCTION__ When used inside a function, it […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"yoast_head":"\nMagic Constants in PHP - blog website<\/title>\n<meta name=\"description\" content=\"Magic Constants in PHPPHP has predefined constants that come with various extensions. 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