PHP Magic Constants

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Posté 2024-05-17 07:40:16
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PHP Predefined Constants

PHP has nine predefined constants that change value depending on where they are used, and therefor they are called "magic constants".

These magic constants are written with a double underscore at the start and the end, except for the ClassName::class constant.

Magic Constants

Here are the magic constants, with descriptions and examples:

Constant Description  
__CLASS__ If used inside a class, the class name is returned. Try it »
__DIR__ The directory of the file. Try it »
__FILE__ The file name including the full path. Try it »
__FUNCTION__ If inside a function, the function name is returned. Try it »
__LINE__ The current line number. Try it »
__METHOD__ If used inside a function that belongs to a class, both class and function name is returned. Try it »
__NAMESPACE__ If used inside a namespace, the name of the namespace is returned. Try it »
__TRAIT__ If used inside a trait, the trait name is returned. Try it »
ClassName::class Returns the name of the specified class and the name of the namespace, if any. Try it »

Note:

The magic constants are case-insensitive, meaning __LINE__ returns the same as __line__.

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