人类可读的文件大小 - human readable file size

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;
}

工作很好，除了：我不能手动选择我需要显示的格式，比如说，无论文件大小如何，我都只想以MB显示。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？

试试这样的东西：

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";
}

Jeffrey Sambells有一个很好的例子：

function human_filesize($bytes, $dec = 2): string {
    $size   = array('B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
    $factor = floor((strlen($bytes) - 1) / 3);
    if ($factor == 0) $dec = 0;

    return sprintf("%.{$dec}f %s", $bytes / (1024 ** $factor), $size[$factor]);
}
echo human_filesize(filesize('example.zip'));

我使用的方法是：

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。

我使用的(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);

关于这些方法的更多信息，请参阅本文。

要扩展Vaidas的答案，以下是您应该如何考虑新的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，你应该使用公制作为默认值(这就是为什么谷歌转换器将kB->MB显示为mod 1000而不是1024(。

这是我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";
}

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

您可以修改您的函数，以满足您强制使用单位(如果给定(和调整精度的需要。

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 />";  ;

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');

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人被打破了，他们假设1KB=1000B。

所以我编码了一个！加上两个辅助功能。它们在这里：

// 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);
    }
}

用法和humanSize(123456789)一样简单。

这就是我的使用方式，它干净而简单。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建议添加点赞评论。

我发现了一个使用switch而不使用"的方法；"断裂"；用于此任务。我想和你分享。此外，我正在使用一个新的"；enum"；我想非常适合这里的特色。

我将代码作为OOP类制作，因此您可以将其作为微服务使用，例如在Symfony或Drupal中。

enum Unit: string {
  case BYTES = 'bytes';
  case KB = 'Kb';
  case MB = 'Mb';
  case GB = 'Gb';
  case TB = 'Tb';
}
class HumanFileSize {
  private int $bytes;
  private ?Unit $unit;
  private int|float $result;
  public function __construct(int $bytes, ?Unit $unit = NULL) {
    $this->bytes = $bytes;
    $this->unit = $unit;
  }
  public function toUnit(Unit $unit): static {
    $this->unit = $unit;
    return $this;
  }
  public function __toString(): string {
    $this->calculate();
    return sprintf('%s %s<br>', is_int($this->result) ? $this->result : number_format($this->result, 2), $this->unit->value);
  }
  private function calculate(): void {
    $this->unit ? $this->calculateByUnit() : $this->calculateUnitAuto();
  }
  private function calculateByUnit(): void {
    $result = $this->bytes;
    switch ($this->unit) {
      case Unit::TB:
        $result /= 1024;
      case Unit::GB:
        $result /= 1024;
      case Unit::MB:
        $result /= 1024;
      case Unit::KB:
        $result /= 1024;
    }
    $this->result = $result;
  }
  private function calculateUnitAuto(): void {
    $result = $this->result = $this->bytes;
    $cases = Unit::cases();
    $factor = 0;
    while (($result /= 1024) >= 1) {
      $this->result = $result;
      $factor++;
    }
    $this->unit = $cases[$factor];
  }
}

示例(客户端代码(：

// Auto units.
print new HumanFileSize(1023);  // 1023 bytes
print new HumanFileSize(1024);  // 1 Kb
print new HumanFileSize(1025);  // 1.00 Kb
// Convert same file size to your units.
$filesize = 123456;
$x = new HumanFileSize($filesize);
print $x;                       // 120.56 Kb (auto units)
// Set units.
print $x->toUnit(Unit::BYTES);  // 123456 bytes
$filesize_mb = $x->toUnit(Unit::MB);
print $filesize_mb;             // 0.12 Mb

这里有一个管理直到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");
}

}