Sort an array based on a given field key http://www.zimplicit.se/knowledge/sort-multidimensional-array-based-given-key-value

gistfile1.php

<?php
/**
* Sort an array based on a given field key
*
* @param unknown_type $named_recs
* @param unknown_type $order_by
* @param unknown_type $rev
* @param unknown_type $flags
* @return unknown
*/
function _named_records_sort($named_recs, $order_by, $reverse=false, $flags=0) {
// Create 1-dimensional named array with just sortfield (in stead of record) values
    $named_hash = array();
     foreach($named_recs as $key=>$fields)
             $named_hash["$key"] = $fields[$order_by];

// Order 1-dimensional array,
// maintaining key-value relations  
    if($reverse) arsort($named_hash,$flags=0) ;
    else asort($named_hash, $flags=0);

// Create copy of named records array
// in order of sortarray 
    $sorted_records = array();
    foreach($named_hash as $key=>$val)
           $sorted_records["$key"]= $named_recs[$key];

    return $sorted_records;

}
?>