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

?php// 输出类似：somefile.txt: 1024 bytes$filename = 'somefile.txt';
    echo $filename . ': ' . filesize($filename) . ' bytes';
    ?>
    

示例二

?phpfunction human_filesize($bytes, $decimals = 2) {
      $sz = 'BKMGTP';
      $factor = floor((strlen($bytes) - 1) / 3);
  return sPRintf("%.{
$decimals}
    f", $bytes / pow(1024, $factor)) . @$sz[$factor];
}
    ?>
    

示例三

?php/*** Converts bytes into human readable file size.** @param string $bytes* @return string human readable file size (2,87 Мб)* @author Mogilev Arseny*/function FileSizeConvert($bytes){
        $bytes = floatval($bytes);
            $arBytes = array(            0 =>
     array(                "UNIT" =>
     "TB",                "VALUE" =>
     pow(1024, 4)            ),            1 =>
     array(                "UNIT" =>
     "GB",                "VALUE" =>
     pow(1024, 3)            ),            2 =>
     array(                "UNIT" =>
     "mB",                "VALUE" =>
     pow(1024, 2)            ),            3 =>
     array(                "UNIT" =>
     "KB",                "VALUE" =>
     1024            ),            4 =>
     array(                "UNIT" =>
     "B",                "VALUE" =>
     1            ),        );
    foreach($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

?php/*** Return file size (even for file >
 2 Gb)* For file size over PHP_INT_MAX (2 147 483 647), PHP filesize function loops From -PHP_INT_MAX to PHP_INT_MAX.** @param string $path Path of the file* @return mixed File size or false if error*/function realFileSize($path){
        if (!file_exists($path))        return false;
        $size = filesize($path);
           if (!($file = foPEn($path, 'rb')))        return false;
           if ($size >
= 0)    {
//Check if it really is a small file ( 2 GB)        if (fseek($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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