Trouble updating a particular user in a mysql database -

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im trying update particular user logged in using update mysql command, instead going first user in database itself, if can id appreciate it

edit: im wanting increment number of 'items' user has, code below going first user in database

<?php session_start();         $dbhost = 'localhost';         $dbuser = '';         $dbpass = '';         $dbname = '';         $conn = mysql_connect($dbhost,$dbuser,$dbpass)             or die ('error connecting mysql');         mysql_select_db($dbname);             $query = sprintf("update users set item = item + 1 ",         mysql_real_escape_string($_post['item']));             mysql_query($query);         ?>

your sprintf() call has parameter, no placeholder:

$query = sprintf("update users set item = item + 1 ",       mysql_real_escape_string($_post['item']));

probably supposed following, assuming int column named item

$query = sprintf("update users set item = item + 1 item = %d ",     mysql_real_escape_string($_post['item']));

update

if trying target specific user only, need user's id or username in $_post instead of item. you'll need post output of var_dump($_post) see values you've received in post.

assuming string username, use:

$query = sprintf("update users set item = item + 1 username = '%s' ",     mysql_real_escape_string($_post['username']));

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