插入排序的PHP实现

<?php
function insertion_sort(array $anArr){        
    for($i = 1;$i < count($anArr) ; $i++){        
        $dump = $anArr[$i];        
        $j = $i;        
        while($j > 0 &amp;&amp; $dump < $anArr[$j - 1]){        
            $anArr[$j] = $anArr[$j - 1];        
            $j = $j - 1;        
            if($j < 0){        
                echo "f";        
            }        
        }        
        $anArr[$j] = $dump;        
        }        
    return $anArr;        
} ?>