how do i use loop in select query

Question

How do I use loop in select query? Query only fetch one Row, at a time, from Select Query. I want to fetch multiple rows In the Select Query but through a loop

Select ID

$id=$_REQUEST['id'];
function get_id($id){
    $result1=mysql_query("select * from products where id='$id'") 
    or die("Id Problem"."<br/><br/>".mysql_error());
    $results1= array();
    $k=0; // add the new line
    while($row1=mysql_fetch_assoc($result1)){
        $results1[] = $row1['id'];
        $k++;
    }
    return $results1;
}

Pid Array

 $pid1=get_id($id);
 <?php 
     $max1=count($pid1);
     for($n=0; $n<$max1; $n++)
     {?>
         <input type="hidden" name="pid[]" value="<?php echo $pid1[$n]?>" />
 <?php }?>

Pid Session

$_SESSION['pid']=$_POST['pid'];

I want fetch Multiple Rows In Select Query But through Loop

<?php 
$pid = join(',',$_SESSION['pid']); 
$result=mysql_query("SELECT id AS wid FROM mywishlist 
where pid='$pid'") 
or die("Id     Problem"."<br/><br/>".mysql_error());
$results= array();
$i=0; // add the new line
while($row=mysql_fetch_array($result)){
    $results[$i] = $row['wid'];
    $i++;
}
echo $results;

$max=count($results);
for($j=0; $j<$max; $j++)
{
?>
    <input type="text" name="wid[]" value="<?php echo $results[$j]; ?>" />
<?php }?>

Answer 1

You're doing some things the hard way, tracking and controlling things that would run fine on autopilot. For example - for loops require you to know the length while foreach loops just run 'til they're done.

Letting PHP take care of the array index by using [] instead of assigning the index will also save you some effort. And since each of your loops really only does one thing, they don't really need braces.

$result=mysql_query('SELECT id AS wid FROM mywishlist where pid="'.$pid.'"') or die(); 
$results= array();
while($row=mysql_fetch_array($result)) 
    $results[]=$row['wid'];
foreach($results as $wid)
    echo '<input type="text" name="wid[]" value="'.$wid.'" />';

Of course, you could eliminate one of these loops because they both essentially handle the same data...

$result=mysql_query('SELECT id AS wid FROM mywishlist where pid="'.$pid.'"') or die(); 
while($row=mysql_fetch_array($result)) 
    echo '<input type="text" name="wid[]" value="'.$row['wid'].'" />';

Furthermore, reidentifying the key from id to wid doesn't make much sense. Since there is only 1 field in the result, why bother identifying it - we can just fetch the row.

$result=mysql_query('SELECT id FROM mywishlist where pid="'.$pid.'"') or die(); 
while($row=mysql_fetch_row($result)) 
    echo '<input type="text" name="wid[]" value="'.$row[0].'" />';

Ooh, let's do it in 2 lines

$result=mysql_query('SELECT id FROM mywishlist where pid="'.$pid.'"') or die(); 
while($row=mysql_fetch_row($result)) echo '<input type="text" name="wid[]" value="'.$row[0].'" />';