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Asked: 2026-05-29T10:37:53+00:00

How do you represent the concept of undefined in PHP? SQL has NULL ,

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How do you represent the concept of “undefined” in PHP?

SQL has “NULL“, Python has “None“, what is the equivalent in PHP?

[updated]

Tanks everybody for the enlightening discussion (cHao, had you
written a response rather than a comment I would choose yours).

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1 Answer

  1. Editorial Team

    Php has NULL too

    Taken from the docs

    The special NULL value represents a variable with no value. NULL is
    the only possible value of type NULL.

    A variable is considered to be null if:

    • it has been assigned the constant NULL.

    • it has not been set to any value yet.

    • it has been unset().

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