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Asked: 2026-05-23T07:23:52+00:00

Could someone please explain to me on when should one use the include and

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Could someone please explain to me on when should one use the include and include_once and how should one be using it.

I am new to PHP and would like to understand this is laymans terms. Not too clear with whats mentioned on PHP documentation at php.net.

Let us say I have the following folder structure

–>Root–>API–>User.php

–>Root–>Users–>CreateUser.php

If I have to use the User.php in CreateUser.php how should I be doing it.

And if there is another file under

–>Root–>API–>Utility–>ImageProcessor.php

How should i being including ImageProcessor.php with CreateUser.php

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1 Answer

  1. Editorial Team

    If you always include_once everything will be ok. It prevents including the same file twice.

    Let’s say you have these files:

    c: include b; include a;

    b: include a;

    a: echo "hello";

    when you execute c, a will be included twice (most probably an unwanted situation), therefore if you use all of them as include_once it will be called only once.

    It comes with a little performance cost however if you are not Facebook or so, that is not a significant cost.

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