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<?php 
# 
# sorts an array of named arrays by the supplied fields 
#   code by dholmes at jccc d0t net 
#   taken from http://au.php.net/function.uasort 
# modified by cablehead, messju and pscs at http://www.phpinsider.com/smarty-forum 

function array_sort_by_fields(&$data, $sortby){ 
      static $sort_funcs = array(); 
      
    if (empty($sort_funcs[$sortby])) 
    { 
        $code = "\$c=0;"; 
        foreach (explode(',', $sortby) as $key) 
        { 
           $d = '1'; 
              if (substr($key, 0, 1) == '-') 
              { 
                 $d = '-1'; 
                 $key = substr($key, 1); 
              } 
              if (substr($key, 0, 1) == '#') 
              { 
                 $key = substr($key, 1); 
               $code .= "if ( ( \$c = (\$a['$key'] - \$b['$key'])) != 0 ) return $d * \$c;\n"; 
              } 
              else 
              { 
               $code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return $d * \$c;\n"; 
            } 
        } 
        $code .= 'return $c;'; 
        $sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code); 
    } 
    else 
    { 
        $sort_func = $sort_funcs[$sortby]; 
    }    
    uasort($data, $sort_func);    
} 

# 
# Modifier: sortby - allows arrays of named arrays to be sorted by a given field 
# 
function smarty_modifier_sortby($arrData,$sortfields) { 
   array_sort_by_fields($arrData,$sortfields); 
   return $arrData; 
} 

$smarty->register_modifier( "sortby", "smarty_modifier_sortby" );    
?>