removing an array element

A quick question: what function is used to remove an array element from an array? Like array_pop(), except one by which I can refer to the element by its associative index rather than just the last element of the array. For more detail with what I'm doing, I have two versions of a <select> listbox -- one that includes an <option> with selected="yes" (if the user is calling this page from submitting a form). The other version is for users who are NOT calling this page from submitting a form, i.e. for the first time. I would like, in the first version (if ($formfilled)), to REMOVE the element $temprow['div_name'] from the array $temprow so that it doesn't appear a second time (in the WHILE loop), since it has already been echoed above the WHILE loop. Is this even possible? $home_div_id = $myrow['home_div_id']; // (from another SQL query

$div_name = $myrow['div_name'];       // earlier in the script)

$tempsql = "SELECT divisions.div_name, divisions.div_id

            FROM divisions";

$tempresult = mysql_query($tempsql, $db); $temprow = mysql_fetch_array($tempresult);

if ($formfilled) {                   // if this page is called with
                                     // the form fields filled, grab
                                     // $home_div_id and make it
                                     // selected="yes"
    echo "<select name=\"home_div_id\">\n";
    echo "<option value=\"$home_div_id\" selected=\"yes\">$div_name</option>\n";
    while ($temprow = mysql_fetch_array($tempresult)) {
        echo "<option value=\"" . $temprow['div_id']
              . "\">" . $temprow['div_name'] . "</option>\n";
    }
    echo "</select>\n";
} else {                             // if this page is called with
                                     // blank form fields, same thing
                                     // except no "selected" attribute
    echo "<select name=\"home_div_id\">\n";
    while ($temprow = mysql_fetch_array($tempresult)) {
        echo "<option value=\"" . $temprow['div_id']
              . "\">" . $temprow['div_name'] . "</option>\n";
    }
    echo "</select>\n";

}