冒泡排序

$a = ["88",'1','3','45','99','22'];
$b = count($a);
for($i = 0; $i<$b; $i++){
    $c = '';
    for($j = 0; $j<$b-1; $j++){
        if($a[$j] < $a[$j+1] ){
            $c = $a[$j];
            $a[$j] = $a[$j+1];
            $a[$j+1] = $c;
        }
    }
}
print_r($a)