Description:
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http://de2.php.net/manual/de/function.array-multisort.php

at example 214. (english "example" = german "Beispiel") is an error with case sensitive variable names

quote:

$data[] = array('Band' => 67, 'Auflage' => 2);
$data[] = array('Band' => 86, 'Auflage' => 1);
$data[] = array('Band' => 85, 'Auflage' => 6);
$data[] = array('Band' => 98, 'Auflage' => 2);
$data[] = array('Band' => 86, 'Auflage' => 6);
$data[] = array('Band' => 67, 'Auflage' => 7);

foreach ($data as $key => $row) {
    $band[$key]  = $row['band']; // <== error
    $auflage[$key] = $row['auflage']; // <== error
}