38 
function humanFileSize($size)
{
    if ($size >= 1073741824) {
      $fileSize = round($size / 1024 / 1024 / 1024,1) . 'GB';
    } elseif ($size >= 1048576) {
        $fileSize = round($size / 1024 / 1024,1) . 'MB';
    } elseif($size >= 1024) {
        $fileSize = round($size / 1024,1) . 'KB';
    } else {
        $fileSize = $size . ' bytes';
    }
    return $fileSize;
}

...效果很好，除了：我无法手动选择需要显示的格式，比如我只想以 MB 显示文件大小。目前如果它在 GB 范围内，它只会以 GB 显示。

另外，如何将小数限制为2？

4

12 回答 12

59

尝试这样的事情：

function humanFileSize($size,$unit="") {
  if( (!$unit && $size >= 1<<30) || $unit == "GB")
    return number_format($size/(1<<30),2)."GB";
  if( (!$unit && $size >= 1<<20) || $unit == "MB")
    return number_format($size/(1<<20),2)."MB";
  if( (!$unit && $size >= 1<<10) || $unit == "KB")
    return number_format($size/(1<<10),2)."KB";
  return number_format($size)." bytes";
}
于 2013-03-03T16:56:10.673 回答
49

Jeffrey Sambells有一个很好的例子：

function human_filesize($bytes, $dec = 2) 
{
    $size   = array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
    $factor = floor((strlen($bytes) - 1) / 3);

    return sprintf("%.{$dec}f", $bytes / pow(1024, $factor)) . @$size[$factor];
}

print human_filesize(filesize('example.zip'));
于 2014-05-27T11:58:45.923 回答
17

我正在使用这种方法：

function byteConvert($bytes)
{
    if ($bytes == 0)
        return "0.00 B";

    $s = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
    $e = floor(log($bytes, 1024));

    return round($bytes/pow(1024, $e), 2).$s[$e];
}

在 o(1) 中效果很好。

于 2015-01-20T14:35:09.553 回答
7

我使用（1024 = 1KB）并支持从 KB 到 YB 的一个非常短的 3 行方法如下：

<?php 

/**
 * Converts a long string of bytes into a readable format e.g KB, MB, GB, TB, YB
 * 
 * @param {Int} num The number of bytes.
 */
function readableBytes($bytes) {
    $i = floor(log($bytes) / log(1024));

    $sizes = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');

    return sprintf('%.02F', $bytes / pow(1024, $i)) * 1 . ' ' . $sizes[$i];
}

// "1000 B"
echo readableBytes(1000);

// "9.42 MB"
echo readableBytes(9874321);

// "9.31 GB"
// The number of bytes as a string is accepted as well
echo readableBytes("10000000000");

// "648.37 TB"
echo readableBytes(712893712304234);

// "5.52 PB"
echo readableBytes(6212893712323224);

有关这些方法的更多信息，请参阅本文。

于 2018-03-31T13:48:24.570 回答
5

为了扩展 Vaidas 的答案，您应该按照以下方式来考虑新的 IEC 标准：

function human_readable_bytes($bytes, $decimals = 2, $system = 'binary')
{
    $mod = ($system === 'binary') ? 1024 : 1000;

    $units = array(
        'binary' => array(
            'B',
            'KiB',
            'MiB',
            'GiB',
            'TiB',
            'PiB',
            'EiB',
            'ZiB',
            'YiB',
        ),
        'metric' => array(
            'B',
            'kB',
            'MB',
            'GB',
            'TB',
            'PB',
            'EB',
            'ZB',
            'YB',
        ),
    );

    $factor = floor((strlen($bytes) - 1) / 3);

    return sprintf("%.{$decimals}f%s", $bytes / pow($mod, $factor), $units[$system][$factor]);
}

从技术上讲，根据存储设备的规范等，您应该默认使用公制系统（这就是为什么 Google 转换器将 kB -> MB 显示为 mod 1000 而不是 1024）。

于 2016-07-29T12:42:15.470 回答
2

这是我用于显示人类可读文件大小的自定义函数：

function getHumanReadableSize($bytes) {
  if ($bytes > 0) {
    $base = floor(log($bytes) / log(1024));
    $units = array("B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"); //units of measurement
    return number_format(($bytes / pow(1024, floor($base))), 3) . " $units[$base]";
  } else return "0 bytes";
}
于 2021-03-10T21:51:31.787 回答
1

你可以修改你的函数来满足你需要强制一个单位（如果给定）和调整精度。

function humanFileSize($size, $precision = 1, $show = "")
{
    $b = $size;
    $kb = round($size / 1024, $precision);
    $mb = round($kb / 1024, $precision);
    $gb = round($mb / 1024, $precision);

    if($kb == 0 || $show == "B") {
        return $b . " bytes";
    } else if($mb == 0 || $show == "KB") {
        return $kb . "KB";
    } else if($gb == 0 || $show == "MB") {
        return $mb . "MB";
    } else {
        return $gb . "GB";
    }
}

//Test with different values
echo humanFileSize(1038) . "<br />";    
echo humanFileSize(103053, 0) . "<br />";
echo humanFileSize(103053) . "<br />";
echo humanFileSize(1030544553) . "<br />";
echo humanFileSize(1030534053405, 2, "GB") . "<br />";  ;
于 2013-03-03T17:06:12.383 回答
1 
function getHumanReadableSize($size, $unit = null, $decemals = 2) {
    $byteUnits = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
    if (!is_null($unit) && !in_array($unit, $byteUnits)) {
        $unit = null;
    }
    $extent = 1;
    foreach ($byteUnits as $rank) {
        if ((is_null($unit) && ($size < $extent <<= 10)) || ($rank == $unit)) {
            break;
        }
    }
    return number_format($size / ($extent >> 10), $decemals) . $rank;
}

如果 php 版本低于 5.4 使用 $byteUnits = array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');

于 2013-11-19T08:15:51.950 回答
1

我想要一个像 Windows 一样返回文件大小的函数，但令人惊讶的是我根本找不到。更糟糕的是，这里和其他地方的一些被破坏，因为他们假设 1KB = 1000B。

所以我编码了一个！加上两个辅助函数。他们来了：

// Returns a size in a human-readable form from a byte count.
function humanSize($bytes)
{
    if ($bytes < 1024) return "$bytes Bytes";

    $units = ['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];

    foreach ($units as $i => $unit)
    {
        // The reason for this threshold is to avoid e.g., "1000 KB",
        // instead jumping from e.g., "999 KB" to "0.97 MB".
        $multiplier = pow(1024, $i + 1);
        $threshold = $multiplier * 1000;

        if ($bytes < $threshold)
        {
            $size = formatToMinimumDigits($bytes / $multiplier, false);
            return "$size $unit";
        }
    }
}

// Efficiently calculates how many digits the integer portion of a number has.
function digits($number)
{
    // Yes, I could convert to string and count the characters,
    // but this is faster and cooler.
    $log = log10($number);
    if ($log < 0) return 1;
    return floor($log) + 1;
}

// Formats a number to a minimum amount of digits.
// In other words, makes sure that a number has at least $digits on it, even if
// that means introducing redundant decimal zeroes at the end, or rounding the
// ones present exceeding the $digits count when combined with the integers.
// For example:
//     formatToMinimumDigits(10)           // 10.0
//     formatToMinimumDigits(1.1)          // 1.10
//     formatToMinimumDigits(12.34)        // 12.3
//     formatToMinimumDigits(1.234)        // 1.23
//     formatToMinimumDigits(1.203)        // 1.20
//     formatToMinimumDigits(123.4)        // 123
//     formatToMinimumDigits(100)          // 100
//     formatToMinimumDigits(1000)         // 1000
//     formatToMinimumDigits(1)            // 1.00
//     formatToMinimumDigits(1.002)        // 1.00
//     formatToMinimumDigits(1.005)        // 1.01
//     formatToMinimumDigits(1.005, false) // 1.00
// This is primarily useful for generating human-friendly numbers.
function formatToMinimumDigits($value, $round = true, $digits = 3)
{
    $integers = floor($value);

    $decimalsNeeded = $digits - digits($integers);

    if ($decimalsNeeded < 1)
    {
        return $integers;
    }
    else
    {
        if ($round)
        {
            // This relies on implicit type casting of float to string.
            $parts = explode('.', round($value, $decimalsNeeded));
            // We re-declare the integers because they may change
            // after we round the number.
            $integers = $parts[0];
        }
        else
        {
            // Again, implicit type cast to string.
            $parts = explode('.', $value);
        }

        // And because of the implicit type cast, we must guard against
        // 1.00 becoming 1, thus not exploding the second half of it.
        $decimals = isset($parts[1]) ? $parts[1] : '0';
        $joined = "$integers.$decimals".str_repeat('0', $digits);
        return substr($joined, 0, $digits + 1);
    }
}

用法很简单humanSize(123456789)。

于 2013-12-18T07:25:42.787 回答
1 
function bytesToHuman($bytes)
{
    $units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
    for ($i = 0; $bytes > 1024; $i++) $bytes /= 1024;
    return round($bytes, 2) . ' ' . $units[$i];
}

信用：https ://laracasts.com/discuss/channels/laravel/human-readable-file-size-and-time?page=1#reply=115796

于 2019-12-18T06:21:40.937 回答
1

我就是这样用的，干净又简单。也可以这样使用：

public function getHumanReadableFilesize(int $bytes, int $dec = 2): string
{
    $size   = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
    $factor = floor((strlen($bytes) - 1) / 3);

    return sprintf("%.{$dec}f %s", ($bytes / (1024 ** $factor)), $size[$factor]);
}

感谢@Márton Tamás 提出添加点赞评论的建议。

于 2020-04-08T11:16:47.167 回答
-1

这是一个管理到 Yottabyte 的工作函数：

function DisplayFileSize($size, $unit = false, $precision = 2){

$b = $size;
$kb = round($size / 1024, $precision);
$mb = round($kb / 1024, $precision);
$gb = round($mb / 1024, $precision);
$tb = round($gb / 1024, $precision);
$pb = round($tb / 1024, $precision);
$eb = round($pb / 1024, $precision);
$zb = round($eb / 1024, $precision);
$yb = round($zb / 1024, $precision);

if((!$unit && floor($kb) == 0) || $unit == "b") {
    return array("value" => FormatNumber($b), "unit" => "bytes");
} else if((!$unit && floor($mb) == 0) || $unit == "kb") {
    return array("value" => FormatNumber($kb, 2), "unit" => "Kb");
} else if((!$unit && floor($gb) == 0) || $unit == "mb") {
    return array("value" => FormatNumber($mb, 2), "unit" => "Mb");
 } else if((!$unit && floor($tb) == 0) || $unit == "gb") {
     return array("value" => FormatNumber($gb, 2), "unit" => "Gb");
 } else if((!$unit && floor($pb) == 0) || $unit == "tb") {
     return array("value" => FormatNumber($tb, 2), "unit" => "Tb");
 } else if((!$unit && floor($eb) == 0) || $unit == "pb") {
    return array("value" => FormatNumber($pb, 2), "unit" => "Pb");
 } else if((!$unit && floor($zb) == 0) || $unit == "eb") {
     return array("value" => FormatNumber($eb, 2), "unit" => "Eb");
 } else if((!$unit && floor($yb) == 0) || $unit == "zb") {
     return array("value" => FormatNumber($zb, 2), "unit" => "Zb");
} else {
    return array("value" => FormatNumber($yb, 2), "unit" => "Yb");
}

}

于 2015-05-22T06:28:46.900 回答