Array sort from a flat text delimited file

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Can someone help me sort this array depending on a sum of columns 3 to 9 of the text file (data.txt)? I have done the array listing but I dont know how to sort it

 

$max = 0;
$file = file("data.txt");
$r=0;
$sum=array();
foreach ($file as $line){
list($row[$r]['partno'], $row[$r]['title'], $row[$r]['color'], $row[$r]['width'], $row[$r]['length'], $row[$r]['height'], $row[$r]['time'], $row[$r]['price'], $row[$r]['place']) = split(";", $line);
$sum[r]=$row[$r]['color'] + $row[$r]['width'] + $row[$r]['length'] + $row[$r]['height'] + $row[$r]['time'] + $row[$r]['price'] + $row[$r]['place'];
echo 'Name DD. :'.$row[$r]['title'].'with :'.$sum[r].' records<br>';
$r++;

}

 

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