Question

Currently I have a piece of code that functions fine as it is. But what I really want to do is take the <?php if strval ..?> part and place it into the "SELECT * FROM projects" part as a WHERE clause. I am not sure whether this is possible or how to go about it. Any thoughts would be really valued. Hope this makes sense.

<?php 

//  ** User ID
$userid = $row_listelements ['id'];

// ** Projects
mysql_select_db($database_db, $db);
$query_activeusers = "SELECT * FROM projects ";
$activeusers = mysql_query($query_activeusers, $db) or die(mysql_error());
$row_activeusers = mysql_fetch_assoc($activeusers);
$totalRows_activeusers = mysql_num_rows($activeusers);

?>

<? do {?>

<?php if (!(strpos($row_activeusers['assignedto'], strval(",".$userid.",")) === false)) { ?>
<div><?=$row_activeusers['jobnumberdisplay'];?></div>
<?php } ?>

<? } while ($row_activeusers = mysql_fetch_assoc($activeusers)); ?>    

<strong><?php echo $totalRows_activeusers; ?></strong>

Answer 1

In case your userid is a unique number, and I understand your question correctly, you could reach this by:

using IN – can handle strings and numbers (they have to be unique to make this work):

$query_activeusers = "SELECT * FROM projects WHERE ".$userid." IN (assignedto)";

or using FIND_IN_SET – can handle Strings and numbers is case sensitive:

$query_activeusers = "SELECT * FROM projects WHERE FIND_IN_SET('".$userid."', assignedto)"

But I think you should look at your database design. The trouble with including Foreign Keys in a delimited list like this is that whole point of a foreign key is to enable you to locate the information in the other table quickly, using Indexes. By implementing a database as it sounds you have, you have all sorts of issues to resolve.