快速排序（php实现）

<?php
function p($myArr,$low,$high){        
    $key = $myArr[$low];        
    while($low < $high){        
        while($low < $high &amp;&amp; $key <= $myArr[$high]){        
            $high --;        
        }        
        $tmp = $myArr[$low];        
        $myArr[$low] = $myArr[$high];        
        $myArr[$high] = $tmp;        
        while($low < $high &amp;&amp; $key >= $myArr[$low]){        
            $low ++;        
        }        
        $tmp = $myArr[$low];        
        $myArr[$low] = $myArr[$high];        
        $myArr[$high] = $tmp;        
    }        
    return $low;        
}        
function qSort($myArr,$low,$high){        
    if($low < $high){        
        $keysite = p($myArr,$low,$high);        
        qSort($myArr,$low,$keysite-1);        
        qSort($myArr,$keysite+1,$high);        
    }        
}        
$myArr = array(49,38,65,97,76,13,27);        
qSort($myArr,0,6);        
foreach($myArr as $value){        
    echo $value.'<br>';        
}        
?>