php冒泡排序的小例子

<?php 
/**
* php冒泡排序
* by www.jbxue.com
**/
function phpsort($arrs,$a = 'sort'){ 
    $arr = $arrs; 
    if(is_array($arr)){ 
        for ($i = 0; $i < count($arr); $i++){ 
            for ($j = 0;$j < count($arr)-1; $j++){ 
                if($a == 'sort'){ 
                    if ($arr[$j] > $arr[$j+1]){ 
                        $temp = $arr[$j+1]; 
                        $arr[$j+1] = $arr[$j]; 
                        $arr[$j] = $temp; 
                    } 
                }elseif ($a == 'asort'){
                    if ($arr[$j] < $arr[$j+1]){ 
                        $temp = $arr[$j+1]; 
                        $arr[$j+1] = $arr[$j]; 
                        $arr[$j] = $temp; 
                    } 
                } 
            } 
        } 
    } 
    return $arr; 
} 

//调用示例
$arrs = array(8,4,3,6,1,0,2,22,45); 
$sorts = phpsort($arrs,'sort'); //正向排序 
print_r($sorts);  
echo '<br />'; 
$asorts = phpsort($arrs,'asort');//反向排序 
print_r($asorts);  
?>