What are magic constants in PHP?

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PHP magic constants are predefined constants, which change based on their use. They start with a double underscore (__) and end with a double underscore (__).

In PHP, magic constants are special predefined constants that change based on their usage context. These constants are prefixed and suffixed with double underscores. Here are some examples of magic constants in PHP:

  1. __LINE__: Represents the current line number of the file.
  2. __FILE__: Represents the full path and filename of the file.
  3. __DIR__: Represents the directory of the file.
  4. __FUNCTION__: Represents the name of the current function.
  5. __CLASS__: Represents the name of the current class.
  6. __METHOD__: Represents the name of the current class method.
  7. __NAMESPACE__: Represents the name of the current namespace.

These magic constants are automatically populated by PHP at runtime, providing useful information for debugging, logging, or dynamic code generation purposes.