PHP将KB MB GB TB等转换为Bytes


PHP convert KB MB GB TB etc to Bytes


我在问如何转换KB MB GB TB&co.转换为字节
例如:

byteconvert("10KB") // => 10240
byteconvert("10.5KB") // => 10752
byteconvert("1GB") // => 1073741824
byteconvert("1TB") // => 1099511627776

等等…

编辑:哇。我4年前就提出过这个问题。这类事情真的向你展示了随着时间的推移你进步了多少!

这里有一个实现这一点的函数:

function convertToBytes(string $from): ?int {
    $units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
    $number = substr($from, 0, -2);
    $suffix = strtoupper(substr($from,-2));
    //B or no suffix
    if(is_numeric(substr($suffix, 0, 1))) {
        return preg_replace('/[^'d]/', '', $from);
    }
    $exponent = array_flip($units)[$suffix] ?? null;
    if($exponent === null) {
        return null;
    }
    return $number * (1024 ** $exponent);
}
$testCases = ["13", "13B", "13KB", "10.5KB", "123Mi"];
var_dump(array_map('convertToBytes', $testCases));

输出:

array(5){[0]=>int(13)[1]=>int(十三)[2]=>int(13312)[3]=>int(10752)[4]=>NULL}int(1)

function toByteSize($p_sFormatted) {
    $aUnits = array('B'=>0, 'KB'=>1, 'MB'=>2, 'GB'=>3, 'TB'=>4, 'PB'=>5, 'EB'=>6, 'ZB'=>7, 'YB'=>8);
    $sUnit = strtoupper(trim(substr($p_sFormatted, -2)));
    if (intval($sUnit) !== 0) {
        $sUnit = 'B';
    }
    if (!in_array($sUnit, array_keys($aUnits))) {
        return false;
    }
    $iUnits = trim(substr($p_sFormatted, 0, strlen($p_sFormatted) - 2));
    if (!intval($iUnits) == $iUnits) {
        return false;
    }
    return $iUnits * pow(1024, $aUnits[$sUnit]);
}

到目前为止,我提出了一个更优雅的解决方案:

/**
 * Converts a human readable file size value to a number of bytes that it
 * represents. Supports the following modifiers: K, M, G and T.
 * Invalid input is returned unchanged.
 *
 * Example:
 * <code>
 * $config->human2byte(10);          // 10
 * $config->human2byte('10b');       // 10
 * $config->human2byte('10k');       // 10240
 * $config->human2byte('10K');       // 10240
 * $config->human2byte('10kb');      // 10240
 * $config->human2byte('10Kb');      // 10240
 * // and even
 * $config->human2byte('   10 KB '); // 10240
 * </code>
 *
 * @param number|string $value
 * @return number
 */
public function human2byte($value) {
  return preg_replace_callback('/^'s*('d+)'s*(?:([kmgt]?)b?)?'s*$/i', function ($m) {
    switch (strtolower($m[2])) {
      case 't': $m[1] *= 1024;
      case 'g': $m[1] *= 1024;
      case 'm': $m[1] *= 1024;
      case 'k': $m[1] *= 1024;
    }
    return $m[1];
  }, $value);
}

我使用一个函数来确定一些cron脚本中为PHP设置的内存限制,如下所示:

$memoryInBytes = function ($value) {
    $unit = strtolower(substr($value, -1, 1));
    return (int) $value * pow(1024, array_search($unit, array(1 =>'k','m','g')));
}

类似的方法可以更好地使用float并接受两个字母的缩写,类似于:

function byteconvert($value) {
    preg_match('/(.+)(.{2})$/', $value, $matches);
    list($_,$value,$unit) = $matches;
    return (int) ($value * pow(1024, array_search(strtolower($unit), array(1 => 'kb','mb','gb','tb'))));
}

由于各种原因,想要类似的东西,又不太喜欢这里发布的其他解决方案,我决定编写自己的函数:

function ConvertUserStrToBytes($str)
{
    $str = trim($str);
    $num = (double)$str;
    if (strtoupper(substr($str, -1)) == "B")  $str = substr($str, 0, -1);
    switch (strtoupper(substr($str, -1)))
    {
        case "P":  $num *= 1024;
        case "T":  $num *= 1024;
        case "G":  $num *= 1024;
        case "M":  $num *= 1024;
        case "K":  $num *= 1024;
    }
    return $num;
}

它采用了Al Jey(空白处理)和John V(切换大小写)在这里提出的一些想法,但没有regex,不调用pow(),让切换大小写在没有中断的情况下完成它的工作,并且可以处理一些奇怪的用户输入(例如,125952中的"123奇妙的KB"结果)。我相信有一个更优化的解决方案,它涉及更少的指令,但代码将不那么干净/可读。

<?php
function byteconvert($input)
{
    preg_match('/('d+)('w+)/', $input, $matches);
    $type = strtolower($matches[2]);
    switch ($type) {
    case "b":
        $output = $matches[1];
        break;
    case "kb":
        $output = $matches[1]*1024;
        break;
    case "mb":
        $output = $matches[1]*1024*1024;
        break;
    case "gb":
        $output = $matches[1]*1024*1024*1024;
        break;
    case "tb":
        $output = $matches[1]*1024*1024*1024;
        break;
    }
    return $output;
}
$foo = "10mb";
echo "$foo = ".byteconvert($foo)." byte";
?>

基于https://stackoverflow.com/a/17364338/1041470

改进:

  • 修复了字节后缀长度的错误
  • 允许使用双(浮点)值,但只能使用整数
  • 保留单元的反向阵列
  • 重命名的变量
  • 添加了评论
/**
 * Converts human readable file size into bytes.
 *
 * Note: This is 1024 based version which assumes that a 1 KB has 1024 bytes.
 * Based on https://stackoverflow.com/a/17364338/1041470
 *
 * @param string $from
 *   Required. Human readable size (file, memory or traffic).
 *   For example: '5Gb', '533Mb' and etc.
 *   Allowed integer and float values. Eg., 10.64GB.
 *
 * @return int
 *   Returns given size in bytes.
 */
function cm_common_convert_to_bytes(string $from): ?int {
  static $units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
  $from = trim($from);
  // Get suffix.
  $suffix = strtoupper(trim(substr($from, -2)));
  // Check one char suffix 'B'.
  if (intval($suffix) !== 0) {
    $suffix = 'B';
  }
  if (!in_array($suffix, $units)) {
    return FALSE;
  }
  $number = trim(substr($from, 0, strlen($from) - strlen($suffix)));
  if (!is_numeric($number)) {
    // Allow only float and integer. Strings produces '0' which is not corect.
    return FALSE;
  }
  return (int) ($number * pow(1024, array_flip($units)[$suffix]));
}

我只是在寻找这个函数,并接受了尝试改进它的挑战,并将其分为两行:)使用与Eugene类似的正则表达式来验证/提取值,但避免了switch语句。可以接受长"10MB"、"10MB"和短"10M"、"10M"值、十进制值,并且始终返回一个整数。无效字符串返回0

function to_bytes( $str )
{
    if( ! preg_match('/^(['d.]+)([BKMGTPE]?)(B)?$/i', trim($str), $m) ) return 0;
    return (int) floor($m[1] * ( $m[2] ? (1024**strpos('BKMGTPE', strtoupper($m[2]))) : 1 ));
}

还有一个解决方案(IEC):

<?php
class Filesize
{
    const UNIT_PREFIXES_POWERS = [
        'B' => 0,
        ''  => 0,
        'K' => 1,
        'k' => 1,
        'M' => 2,
        'G' => 3,
        'T' => 4,
        'P' => 5,
        'E' => 6,
        'Z' => 7,
        'Y' => 8,
    ];
    public static function humanize($size, int $precision = 2, bool $useBinaryPrefix = false)
    {
        $base = $useBinaryPrefix ? 1024 : 1000;
        $limit = array_values(self::UNIT_PREFIXES_POWERS)[count(self::UNIT_PREFIXES_POWERS) - 1];
        $power = ($_ = floor(log($size, $base))) > $limit ? $limit : $_;
        $prefix = array_flip(self::UNIT_PREFIXES_POWERS)[$power];
        $multiple = ($useBinaryPrefix ? strtoupper($prefix) . 'iB' : $prefix . 'B');
        return round($size / pow($base, $power), $precision) . $multiple;
    }
    // ...
}

来源:

https://github.com/mingalevme/utils/blob/master/src/Filesize.phphttps://github.com/mingalevme/utils/blob/master/tests/FilesizeTest.php

我知道这是一个相对古老的主题,但这里有一个函数,当我需要这种东西时,我有时不得不使用它;如果功能不起作用,你可以原谅,我在手机上写了这篇文章:

function intobytes($bytes, $stamp = 'b') {
    $indx = array_search($stamp, array('b', 'kb', 'mb', 'gb', 'tb', 'pb', 'yb'));
    if ($indx > 0) {
        return $bytes * pow(1024, $indx);
    }
    return $bytes;
}

作为紧凑型

function intobytes($bytes, $stamp='b') {$indx=array_search($stamp,array('b','kb','mb','gb','tb','pb','yb'));if($indx > 0){return $bytes * pow(1024,$indx);} return $bytes;}

小心!

Brodde85;)

根据标准,这里有一个更干净的版本(使用上面的答案):

/**
 * Format kb, mb, gb, tb to bytes
 *
 * @param integer $size
 * @return integer
 */
function formatToBytes ($size)
{
    $aUnits = array('bytes' => 0, 'KB' => 1, 'MB' => 2, 'GB' => 3, 'TB' => 4);
    $sUnit = strtoupper(trim(substr($size, -2)));
    if (intval($sUnit) !== 0) {
        $sUnit = 'bytes';
    }
    if (!in_array($sUnit, array_keys($aUnits))) {
        return false;
    }
    $iUnits = trim(substr($size, 0, strlen($size) - 2));
    if (!intval($iUnits) == $iUnits) {
        return false;
    }
    return $iUnits * pow(1024, $aUnits[$sUnit]);
}