Web Reference: Magic constants ¶ There are a few magical constants that change depending on where they are used. For example, the value of __LINE__ depends on the line that it's used on in a script. All these "magical" constants are resolved at compile time, unlike regular constants, which are resolved at runtime. PHP has nine predefined constants that change value depending on where they are used, also called the "magic constants". The magic constants provide information about the current state of the script, such as the file name, directory name, line number, function name, class name, and more. Jul 12, 2025 · Magic constants in PHP are special built-in constants that provide information about the current state of the script, such as the file name, line number, function name, class name, and more. They always start and end with double underscores (__) and are automatically used in by PHP.
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