Sorting multi dimensional arrays

[furious5]

Can anyone help me out, I'm currently wanting to try and sort a multi-dimensional array on a key.

The code I've got so far is this:

function cmp($a, $b)
{
	if($a["par"] > $b["par"]){
   		return strcmp($a["par"], $b["par"]);
	}
}

$playlist[0]["par"] = "-1";
$playlist[1]["par"] = "10";
$playlist[2]["par"] = "-4";
$playlist[3]["par"] = "-2";
$playlist[4]["par"] = "20";
$playlist[5]["par"] = "-8";
$playlist[0]["par"] = "-12";
$playlist[1]["par"] = "-19"; 
$playlist[2]["par"] = "-16"; 
$playlist[3]["par"] = "-13"; 
$playlist[4]["par"] = "-12"; 
$playlist[5]["par"] = "-10"; 
$playlist[6]["par"] = "-4"; 
$playlist[7]["par"] = "-5"; 
$playlist[8]["par"] = "-9"; 
$playlist[9]["par"] = "-2"; 
$playlist[10]["par"] = "-4"; 
$playlist[11]["par"] = "-5"; 
$playlist[12]["par"] = "-7"; 
$playlist[13]["par"] = "-9"; 
$playlist[14]["par"] = "-7";
$playlist[15]["par"] = "-1"; 
$playlist[16]["par"] = "-12"; 
$playlist[17]["par"] = "-1"; 
$playlist[18]["par"] = "-6"; 
$playlist[19]["par"] = "-3"; 
$playlist[20]["par"] = "-1"; 


uksort($playlist, "cmp");

while (list($key, $value) = each($playlist)) {
   echo "\$playlist[$key]: " . $value["par"] ."<br>";
}

If you actually run the code then the sort is totally inaccurate. I was hoping to sort the array so the lowest number comes first.

Anyone got any ideas???

[devinemke]

<?
$playlist[0]['par'] = '-1';
$playlist[1]['par'] = '10';
$playlist[2]['par'] = '-4';
$playlist[3]['par'] = '-2';
$playlist[4]['par'] = '20';
$playlist[5]['par'] = '-8';
$playlist[0]['par'] = '-12';
$playlist[1]['par'] = '-19'; 
$playlist[2]['par'] = '-16'; 
$playlist[3]['par'] = '-13'; 
$playlist[4]['par'] = '-12'; 
$playlist[5]['par'] = '-10'; 
$playlist[6]['par'] = '-4'; 
$playlist[7]['par'] = '-5'; 
$playlist[8]['par'] = '-9'; 
$playlist[9]['par'] = '-2'; 
$playlist[10]['par'] = '-4'; 
$playlist[11]['par'] = '-5'; 
$playlist[12]['par'] = '-7'; 
$playlist[13]['par'] = '-9'; 
$playlist[14]['par'] = '-7';
$playlist[15]['par'] = '-1'; 
$playlist[16]['par'] = '-12'; 
$playlist[17]['par'] = '-1'; 
$playlist[18]['par'] = '-6'; 
$playlist[19]['par'] = '-3'; 
$playlist[20]['par'] = '-1';

foreach ($playlist as $value)
{
	$par_array[] = $value['par'];
}
sort($par_array);
print_r($par_array);
?>