PHP Magic Constants
Postado 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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