Update row in table using php mysql

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my query is here:

XML

$t1 = "(select quantity_app
        from requested
        where requested_id = $_POST[hidden])";
$t2 = "update warehouse
       set quantity = quantity - " . $t1;

this query doesn't run please help me i don't know were i do it wrong!
the quantity_app column must subtract quantity column

Posted 14-Jul-14 13:24pm

Xekria

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W∴ Balboos, *GHB* · Answer 1 · 2014-07-15T00:59:00

At least as your code is written, you never executed the query to get a value in $t1. For that matter, you don't seem to have a connection, either.

Anyway, as written, there's no reason for $t1 to have your value. It's just a string containing a tsql query.

Not the best source, but http://www.w3schools.com/php/php_mysql_intro.asp[^] will help you get on your way. It has an example, a few pages in, of an insert statement.