PHP filesize() 函数

作用：函数返回指定文件的大小

语法：

filesize(filename)

参数：

filename：必需。规定要检查的文件。

返回值：

返回文件大小的字节数，如果出错返回 FALSE 并生成一条 E_WARNING 级的错误。

filesize 示例

示例一

示例二

示例三

 array(
  "UNIT" => "TB",
  "VALUE" => pow(1024, 4)
     ),
     1 => array(
  "UNIT" => "GB",
  "VALUE" => pow(1024, 3)
     ),
     2 => array(
  "UNIT" => "MB",
  "VALUE" => pow(1024, 2)
     ),
     3 => array(
  "UNIT" => "KB",
  "VALUE" => 1024
     ),
     4 => array(
  "UNIT" => "B",
  "VALUE" => 1
     ),
 );

    foreach($arBytes as $arItem)
    {
 if($bytes >= $arItem["VALUE"])
 {
     $result = $bytes / $arItem["VALUE"];
     $result = str_replace(".", "," , strval(round($result, 2)))." ".$arItem["UNIT"];
     break;
 }
    }
    return $result;
}

?>

示例四

= 0)
    {//Check if it really is a small file (< 2 GB)
 if (fseek($file, 0, SEEK_END) === 0)
 {//It really is a small file
     fclose($file);
     return $size;
 }
    }
   
    //Quickly jump the first 2 GB with fseek. After that fseek is not working on 32 bit php (it uses int internally)
    $size = PHP_INT_MAX - 1;
    if (fseek($file, PHP_INT_MAX - 1) !== 0)
    {
 fclose($file);
 return false;
    }
   
    $length = 1024 * 1024;
    while (!feof($file))
    {//Read the file until end
 $read = fread($file, $length);
 $size = bcadd($size, $length);
    }
    $size = bcsub($size, $length);
    $size = bcadd($size, strlen($read));
   
    fclose($file);
    return $size;
}

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