PHP遍历一层目录并返回统计目录大小的示例代码

<?php 
$dirname = "test1"; 
//mkdir($dirname); 

//遍历一层目录 
function listdir($dirname) { 
    $ds = opendir($dirname); 
    while($file = readdir($ds)) { 
        $path = $dirname.'/'.$file; 
        if(is_dir($file)) { 
            echo "DIR:".$file."<br>"; 
            if($file != "." && $file != "..") { 
                listdir($file); 
            } 
        }else { 
           echo "FILE:".$file . "<br>"; 
        } 
    } 
} 

function totdir($dirname) { //对listdir稍加修改 
    static $tot = 0; 
    $ds = opendir($dirname); 
    while($file = readdir($ds)) { 
        $path = $dirname.'/'.$file; 
        if(is_dir($file)) { 
            //echo "DIR:".$file."<br>"; 
            if($file != "." && $file != "..") { 
                $tot += totdir($file); 
            } 
        }else { 
            //echo "FILE:".$file . "<br>"; 
            $tot += filesize($path); 
        } 
} 

//返回总计 
return $tot; 
} 

listdir($dirname); 

echo totdir($dirname)." bytes"; 

?>