PHP - Update a field if its in an array

Question

I'm working on a mailbox system for a game on Facebook. I have 2 inputs to a php script, with example input below:

$FriendIDs = "10000001,10002421,10132000,10074794,13523543"

$MailCode = "ReqGem"

and a table with the columns ID, Mailbox.

What I want to be able to do is concatenate whatever was originally in the Mailbox field, with MailCode, for each person in the FriendIDs.

I figured it was something like this, but I couldn't get it to work (my php/sql knowledge is pretty dire!):

mysqli_query($db, "UPDATE Save SET Mailbox = CONCAT(Mailbox,'$MailCode' . '_') WHERE 'id' IN $FriendIDs);

EDIT: I've just realized I need to add a new row if the FriendID isn't already in the table.

I'm guessing I need to start out with INSERT INTO and then use ON DUPLICATE KEY UPDATE, but I can't seem to get it to work. It's a bit trickier since the unique key is in an array, and I can't use WHERE id IN(ArrayOfValues) in an INSERT query.

Any help would be greatly appreciated!

John Conde · Accepted Answer · 2014-03-29 00:54:15Z

2

You're close:

$FriendIDs = "10000001,10002421,10132000,10074794,13523543";
$MailCode = "ReqGem";
mysqli_query($db, "UPDATE Save SET Mailbox = CONCAT(Mailbox,'$MailCode' . '_') WHERE `id` IN($FriendIDs));

You just needed the parenthesis for IN() as it is a function.
Don't use single quotes for column names. Use ticks. Single quotes are for strings.

answered Mar 29, 2014 at 0:54

John Conde

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1 Comment

Sean Lloyd Over a year ago

Much appreciated. The subtle difference between the tick and the single quote keeps making me slip up!

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