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Home/ Questions/Q 7193453
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T20:10:23+00:00 2026-05-28T20:10:23+00:00

This script works, but it gives a warning if there is no match found:

  • 0

This script works, but it gives a warning if there is no match found:

if (...)
    irrelevant...

elseif ($userId = mysql_result(
                     mysql_query("SELECT id FROM users WHERE mail = 'jhon@doe.com'")
                             , 0))
    echo $userId;

Warning: mysql_result() [function.mysql-result]: Unable to jump to row 0 on MySQL result index 4

Is this ‘good’ php? Or do I have to tackle this another way?

Goal of the script: If there is a user with that mail, give its ID

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  1. Editorial Team
    Editorial Team
    2026-05-28T20:10:24+00:00Added an answer on May 28, 2026 at 8:10 pm

    That’s pretty ugly, especially since you do not have any error handling etc.

    Better create a function performing the check that returns the user id or NULL. Then you can use code like this:

    elseif(($userId = get_userid_by_email('jhon@doe.com')) !== null)
    
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