PJ wrote:
Could somebody please explain this?
When the line - sort($category) is commented out, the output returns
Notice: Undefined offset: in the line "36" for all the repeats (29 in
this case)
The code below:
$SQL = "SELECT name
        FROM categories ORDER BY category_id
$category = array();
if ( ( $results = mysql_query($SQL, $db) ) !== false ) {
    while ( $row = mysql_fetch_assoc($results) ) {
        $category[$row['name']] = $row;
$count = mysql_num_rows($results);
$lastIndex = ceil($count/2 -1); //echo $lastIndex;
$ii = 0;
while ($ii <= $lastIndex) {
    $cat = $category[$ii]['name']; //=======this is line 36==========
    $catn = preg_replace("/[^a-zA-Z0-9]/", "", $cat);
    echo "<a href='../categories/", $catn, ".php'>", $cat, "</a><br />";

$ii = $lastIndex;
//echo $category[$ii]['category'];
while ($ii <= $count -1) {
    $cat = $category[$ii]['name'];
    $catn = preg_replace("/[^a-zA-Z0-9]/", "", $cat);
    echo "<a href='../categories/", $catn, ".php'>", $cat, "</a><br>" ;
echo "</td></tr></table>" ;

The same phenomenon happens in another application using the identical code.
I don't want to sort the category; that has been taken care of in the query.
It just doesn't make sense that sorting would affect the count. :-(

what your doing is:

which sets
$category['some name']

an associative array.

now when you do
you're sorting all results and assigning them to numerical indexes..

so now $category contains:

which is what you need seeing as you are cycling them as a numerical array. so sort is turning your associative array in to the needed indexed array.

if you remove sort($category) and then change this line:
$category[$row['name']] = $row;
$category[] = $row;
you'll find it works without error.


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