PHP递归统计目录下所有子目录文件大小的函数

<?php

    //phpinfo();
     
/**
 * 统计目录文件大小的函数
 * @param $dir 文件路径 
 */
function dirsize($dir)
{
    @$dh = opendir($dir);
    $size = 0;
    while($file = @readdir($dh))
    {
        if($file != "." and $file != "..")
        {
            $path = $dir . "/" . $file;

            if(is_dir($path))
            {
                $size += dirsize($path);
            } elseif(is_file($path)) {
                $size += filesize($path);
            }
        }
    }

    @closedir($dh);
    return $size;
 }
    
   
function add($a, $b) {  
    return $a + $b;  
}  
  
$result = add(2, 3);  
echo "The result of 2 + 3 is: $result";  

echo "<br>";
  
$result = call_user_func(add, 2, 3);  
echo "The result of 2 + 3 is: " . $result;  

echo "<br>";

echo dirsize("./");


?>