if elseif elseif elseif....

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This is probably a mysql question, but their list is rather dull - I
think they don't appreciate my humor. Beside this list is fun ... and
informative.
Anyway, I can't figure this out. I am trying to verify inputs on a form
and even if I have all the required fields right, I still get the error
that there are empty obligatory fields.
This is what I am using... but I'm open to anything that works or is
more efficient:
   
    if (strlen($_POST["titleIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["first_nameIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["publisherIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["copyrightIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["ISBNIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["languageIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif (strlen($_POST["categoriesIN"]) == 0 ) {
            $obligatoryFieldNotPresent = 1;
    }
    elseif ($obligatoryFieldNotPresent = 1) {
            $obligatoryFieldNotPresent = 0;
    }

I've tried closing with
else ($obligatoryFiieldNot Present = 0);
end;
but that give me a blank page - haven't figure out how to check for
parsing or scripting errors
Thanks for any suggestions.

-- 
unheralded genius: "A clean desk is the sign of a dull mind. "
-------------------------------------------------------------
Phil Jourdan --- pj@xxxxxxxxxxxxx
   http://www.ptahhotep.com
   http://www.chiccantine.com/andypantry.php


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