On the official manual, you can read that magic constants are case-insensitive: http://php.net/manual/en/language.constants.predefined.php I’ve

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Editorial Team

Asked: June 9, 20262026-06-09T14:37:38+00:00 2026-06-09T14:37:38+00:00

On the official manual, you can read that magic constants are case-insensitive:

I’ve tested on __tostring() and __toString() and it’s the same = case-insensitive.

There’s no documentation about it.

Do you know if all magic functions are like magic constants = case insensitive?

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Editorial Team · Answer 1 · 2026-06-09T14:37:39+00:00

Note: Function names are case-insensitive, though it is usually good form to call functions as they appear in their declaration.

This has to do how function names are stored in PHP internally. And for some languages (like Turkish) this can even lead to problems:

Variable names on the other hand are case-sensitive:

The variable name is case-sensitive.

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