这有点晚了，但一个稍微快一点的公认答案如下:

function formatBytes($bytes, $precision)
{
    $unit_list = array
    (
        'B',
        'KB',
        'MB',
        'GB',
        'TB',
    );

    $bytes = max($bytes, 0);
    $index = floor(log($bytes, 2) / 10);
    $index = min($index, count($unit_list) - 1);
    $bytes /= pow(1024, $index);

    return round($bytes, $precision) . ' ' . $unit_list[$index];
}

它更有效，因为执行一个log-2操作而不是两个log-e操作。

实际上，下面的解决方案会更快:

function formatBytes($bytes, $precision)
{
    $unit_list = array
    (
        'B',
        'KB',
        'MB',
        'GB',
        'TB',
    );

    $index_max = count($unit_list) - 1;
    $bytes = max($bytes, 0);

    for ($index = 0; $bytes >= 1024 && $index < $index_max; $index++)
    {
        $bytes /= 1024;
    }

    return round($bytes, $precision) . ' ' . $unit_list[$index];
}

这是因为由于索引是在计算值的同时计算出相应的字节数的单位。这将执行时间缩短了约35%(速度提高了55%)。

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);

function byte_format($size) {
    $bytes = array( ' KB', ' MB', ' GB', ' TB' );
    foreach ($bytes as $val) {
        if (1024 <= $size) {
            $size = $size / 1024;
            continue;
        }
        break;
    }
    return round( $size, 1 ) . $val;
}

function convertToReadableSize($size)
{
  $base = log($size) / log(1024);
  $suffix = array("B", "KB", "MB", "GB", "TB");
  $f_base = floor($base);
  return round(pow(1024, $base - floor($base)), 1) . $suffix[$f_base];
}

只需要调用函数

echo convertToReadableSize(1024); // Outputs '1KB'
echo convertToReadableSize(1024 * 1024); // Outputs '1MB'

这是我的选择，简短明了:

/**
 * @param int $bytes Number of bytes (eg. 25907)
 * @param int $precision [optional] Number of digits after the decimal point (eg. 1)
 * @return string Value converted with unit (eg. 25.3KB)
 */
function formatBytes($bytes, $precision = 2) {
    $unit = ["B", "KB", "MB", "GB"];
    $exp = floor(log($bytes, 1024)) | 0;
    return round($bytes / (pow(1024, $exp)), $precision).$unit[$exp];
}

或者，更愚蠢和有效:

function formatBytes($bytes, $precision = 2) {
    if ($bytes > pow(1024,3)) return round($bytes / pow(1024,3), $precision)."GB";
    else if ($bytes > pow(1024,2)) return round($bytes / pow(1024,2), $precision)."MB";
    else if ($bytes > 1024) return round($bytes / 1024, $precision)."KB";
    else return ($bytes)."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];
    }