{"id":71,"date":"2025-03-11T04:22:22","date_gmt":"2025-03-11T04:22:22","guid":{"rendered":"https:\/\/techkubo.com\/php\/?p=71"},"modified":"2025-05-23T17:57:33","modified_gmt":"2025-05-23T17:57:33","slug":"php-magic-constants","status":"publish","type":"post","link":"https:\/\/techkubo.com\/php\/php-magic-constants\/","title":{"rendered":"PHP Magic Constants"},"content":{"rendered":"\n

PHP provides a set of predefined constants known as “magic constants.” These constants can change their value dynamically based on the context in which they are used. Magic constants are always written with double underscores both at the beginning and the end of their name (except for ClassName::class<\/code>).<\/p>\n\n\n\n

The List of Magic Constants and Their Descriptions<\/strong><\/h2>\n\n\n\n
Constant<\/strong><\/th>Description<\/strong><\/th><\/tr><\/thead>
__CLASS__<\/code><\/td>Outputs the name of the class when used inside a class.<\/td><\/tr>
__DIR__<\/code><\/td>Represents the directory path of the current file.<\/td><\/tr>
__FILE__<\/code><\/td>Contains the file name including its complete path.<\/td><\/tr>
__FUNCTION__<\/code><\/td>Displays the name of the function, if used within one.<\/td><\/tr>
__LINE__<\/code><\/td>Indicates the line number where it is called.<\/td><\/tr>
__METHOD__<\/code><\/td>Returns the name of the method along with its class.<\/td><\/tr>
__NAMESPACE__<\/code><\/td>Displays the namespace name, if used inside a namespace.<\/td><\/tr>
__TRAIT__<\/code><\/td>Reflects the name of the trait, if used inside a trait.<\/td><\/tr>
ClassName::class<\/code><\/td>Outputs the name of the class, including the namespace, if applicable.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Examples of PHP Magic Constants in Action<\/strong><\/h2>\n\n\n\n

Below, we\u2019ll explore examples of how to utilize these magic constants. For added flavor, the variables and identifiers in the examples are inspired by motorcycle and car brands.<\/p>\n\n\n\n

    \n
  1. Using __CLASS__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
    class Ducati {\n    public function getClassName() {\n        return __CLASS__;\n    }\n}\n\n$motorbike = new Ducati();\necho $motorbike->getClassName(); \/\/ Output: Ducati<\/pre><\/div>\n\n\n\n
    \n\n\n\n
      \n
    1. Using __DIR__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
      echo "The directory is: " . __DIR__; \n\/\/ Output: Displays the directory path of the current file<\/pre><\/div>\n\n\n\n
      \n\n\n\n
        \n
      1. Using __FILE__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
        echo "The file path is: " . __FILE__; \n\/\/ Output: Displays the full path and file name<\/pre><\/div>\n\n\n\n
        \n\n\n\n
          \n
        1. Using __FUNCTION__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
          function harleyFunction() {\n    return __FUNCTION__;\n}\n\necho harleyFunction(); \/\/ Output: harleyFunction<\/pre><\/div>\n\n\n\n
          \n\n\n\n
            \n
          1. Using __LINE__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
            echo "This is line number: " . __LINE__; \n\/\/ Output: Displays the current line number in the file<\/pre><\/div>\n\n\n\n
            \n\n\n\n
              \n
            1. Using __METHOD__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
              class Toyota {\n    public function getMethod() {\n        return __METHOD__;\n    }\n}\n\n$car = new Toyota();\necho $car->getMethod(); \/\/ Output: Toyota::getMethod<\/pre><\/div>\n\n\n\n
              \n\n\n\n
                \n
              1. Using __NAMESPACE__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
                namespace FordNamespace;\n\necho __NAMESPACE__; \n\/\/ Output: FordNamespace<\/pre><\/div>\n\n\n\n
                \n\n\n\n
                  \n
                1. Using __TRAIT__<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
                  trait HondaTrait {\n    public function getTraitName() {\n        return __TRAIT__;\n    }\n}\n\nclass Sedan {\n    use HondaTrait;\n}\n\n$vehicle = new Sedan();\necho $vehicle->getTraitName(); \/\/ Output: HondaTrait<\/pre><\/div>\n\n\n\n
                  \n\n\n\n
                    \n
                  1. Using ClassName::class<\/code><\/strong><\/li>\n<\/ol>\n\n\n\n
                    namespace Lamborghini;\n\nclass Aventador {}\n\necho Aventador::class; \n\/\/ Output: Lamborghini\\Aventador<\/pre><\/div>\n\n\n\n
                    <\/h3>\n\n\n\n
                    <\/p>\n","protected":false},"excerpt":{"rendered":"
                    PHP provides a set of predefined constants known as “magic constants.” These constants can change their value dynamically based on […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-71","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nPHP Magic Constants - 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