This is really getting frustrating. I have a text file that I'm reading for a list of part numbers that goes into an array. I'm using the following foreach function to search a database for matching numbers.

$file = file('parts_array.txt');

foreach ($file as $newPart)
{
    $sql = "SELECT products_sku FROM products WHERE products_sku='" . $newPart . "'";
    $rs = mysql_query($sql);
    $num_rows = mysql_num_rows($rs);

    echo $num_rows;
    echo "<br />";

}

The problem is I'm getting 0 rows returned from mysql_num_rows. I can type the sql statement without the variable and it works perfectly. I can even echo out the sql statement from this script, copy and paste the statement from the browser and it works. But, for some reason I'm not getting any records when I'm using the variable. I've used variables in sql statements tons of times, but this really has me stumped.