灵活的解决方案:

function size($size, array $options=null) {

    $o = [
        'binary' => false,
        'decimalPlaces' => 2,
        'decimalSeparator' => '.',
        'thausandsSeparator' => '',
        'maxThreshold' => false, // or thresholds key
        'suffix' => [
            'thresholds' => ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'],
            'decimal' => ' {threshold}B',
            'binary' => ' {threshold}iB',
            'bytes' => ' B'
        ]
    ];

    if ($options !== null)
        $o = array_replace_recursive($o, $options);

    $base = $o['binary'] ? 1024 : 1000;
    $exp = $size ? floor(log($size) / log($base)) : 0;

    if (($o['maxThreshold'] !== false) &&
        ($o['maxThreshold'] < $exp)
    )
        $exp = $o['maxThreshold'];

    return !$exp
        ? (round($size) . $o['suffix']['bytes'])
        : (
            number_format(
                $size / pow($base, $exp),
                $o['decimalPlaces'],
                $o['decimalSeparator'],
                $o['thausandsSeparator']
            ) .
            str_replace(
                '{threshold}',
                $o['suffix']['thresholds'][$exp],
                $o['suffix'][$o['binary'] ? 'binary' : 'decimal']
            )
        );
}

var_dump(size(disk_free_space('/')));
// string(8) "14.63 GB"
var_dump(size(disk_free_space('/'), ['binary' => true]));
// string(9) "13.63 GiB"
var_dump(size(disk_free_space('/'), ['maxThreshold' => 2]));
// string(11) "14631.90 MB"
var_dump(size(disk_free_space('/'), ['binary' => true, 'maxThreshold' => 2]));
// string(12) "13954.07 MiB"

kb除以1024,mb除以1024^2,GB除以1024^3。就这么简单。

我知道现在回答这个问题可能有点晚了，但是，更多的数据不会杀死一个人。这是一个非常快速的函数:

function format_filesize($B, $D=2){
    $S = 'BkMGTPEZY';
    $F = floor((strlen($B) - 1) / 3);
    return sprintf("%.{$D}f", $B/pow(1024, $F)).' '.@$S[$F].'B';
}

编辑:我更新了我的帖子，包括由camomileCase提出的修复:

function format_filesize($B, $D=2){
    $S = 'kMGTPEZY';
    $F = floor((strlen($B) - 1) / 3);
    return sprintf("%.{$D}f", $B/pow(1024, $F)).' '.@$S[$F-1].'B';
}

我成功地完成了以下功能，

    function format_size($size) {
        $mod = 1024;
        $units = explode(' ','B KB MB GB TB PB');
        for ($i = 0; $size > $mod; $i++) {
            $size /= $mod;
        }
        return round($size, 2) . ' ' . $units[$i];
    }

试试这个;)

function bytesToSize($bytes) {
                $sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
                if ($bytes == 0) return 'n/a';
                $i = intval(floor(log($bytes) / log(1024)));
                if ($i == 0) return $bytes . ' ' . $sizes[$i]; 
                return round(($bytes / pow(1024, $i)),1,PHP_ROUND_HALF_UP). ' ' . $sizes[$i];
            }
echo bytesToSize(10000050300);

极其简单的函数来获取人类文件大小。

原始来源:http://php.net/manual/de/function.filesize.php#106569

复制/粘贴代码:

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