PHP将KB MB GB TB等转换为字节

时间:2012-08-04 08:27:42

标签: php byte type-conversion


我问的是如何转换KB MB GB TB&合。字节。
例如:

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

依旧......

编辑:哇。我在4年前问过这个问题。这种事情真的告诉你,随着时间的推移你有多少改进!

10 个答案:

答案 0 :(得分:31)

这是实现这一目标的功能:

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(13)[2] => int(13312)[3] =>   int(10752)[4] => NULL} int(1)

答案 1 :(得分:9)

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]);
}

答案 2 :(得分:4)

这是我到目前为止所提出的,我认为这是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);
}

答案 3 :(得分:3)

<?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";
?>

答案 4 :(得分:2)

我使用一个函数来确定在某些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浮点数并接受两个字母的缩写,如下所示:

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'))));
}

答案 5 :(得分:1)

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,
  • 包含单位的还原数组,
  • 重命名变量,
  • 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'];
  $from = trim(check_plain($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]));
}

答案 6 :(得分:0)

我知道这是一个相对古老的话题,但这是我在需要这种东西时有时必须使用的功能;如果功能不起作用,你可以原谅,我在手机上写了这个:

funtion 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;
}

和紧凑

funtion 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;)

答案 7 :(得分:0)

由于各种原因,想要与此类似的东西并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;
}

它适应了Al Jey(空白处理)和John V(开关盒)这里提出的一些想法,但是没有正则表达式,不会调用pow(),让switch-case做它的东西不会中断,并且可以处理一些奇怪的用户输入(例如125952中的“123精彩KB”结果)。我确信有一个更优化的解决方案涉及更少的指令,但代码将更不干净/可读。

答案 8 :(得分:0)

另一个解决方案(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.php https://github.com/mingalevme/utils/blob/master/tests/FilesizeTest.php

答案 9 :(得分:0)

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]);
}