Answer
Magic constants like __FILE__, __LINE__, and __DIR__ provide dynamic information depending on where they are used.
Quick Answer
Magic constants change value depending on where they are used. __LINE__ gives current line number, __FILE__ gives full file path, __DIR__ gives directory path, __CLASS__ gives class name, __METHOD__ gives method name, __NAMESPACE__ gives current namespace. Useful for debugging, logging, and building autoloaders. Always available without any import.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ