php bubble sort method

Why the last one can’t be ranked

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Why the last one can’t be ranked

You should let $i=0 in the first for

================================
I guess you made a mistake and copied $i into $j.

j = 0;
j = 1;
j = 2;
//Oops, I accidentally copied it wrong and only executed it 3 times
exit;

The number of loops is wrong, $j
The second level loop should be -$i, not minus $j

<code>$arr = array(21,7,5,23,2);
var_dump($arr);
$long = count($arr);
for($i=0;$i<$long;$i++){
    for($j=0;$j<$long-$i-1;$j++){
        if($arr[$j]>$arr[$j+1]){
            $x = $arr[$j+1];
            $arr[$j+1]=$arr[$j];
            $arr[$j]=$x;
        }
    }
}
var_dump($arr);</code>