injection sort

<?php
$n=[6,3,4,1,7,5,2,9,8];
foreach($n as $val)
    echo $val;
echo "<br />";
for($i=1; $i<(sizeof($n));$i++){
    $placeholder=$n[$i];
    $count=$i;
    while($count>0 && $n[$count-1] > $placeholder){
        $n[$count]=$n[$count-1];
        $count=$count-1;
    }
    $n[$count]=$placeholder;
    foreach($n as $val)
        echo$val;
    echo "<br />";
}
?>