PHP 将 KB MB GB TB 等转换为字节
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PHP convert KB MB GB TB etc to Bytes
提问by user1494162
I'm asking how to convert KB MB GB TB & co. into bytes.
For example:
我在问如何转换 KB MB GB TB & co。成字节。
例如：
byteconvert("10KB") // => 10240
byteconvert("10.5KB") // => 10752
byteconvert("1GB") // => 1073741824
byteconvert("1TB") // => 1099511627776
and so on...
等等...
EDIT: wow. I've asked this question over 4 years ago. Thise kind of things really show you how much you've improved over time!
编辑：哇。我在 4 年前问过这个问题。这种事情真的向你展示了你随着时间的推移进步了多少！
回答by John V.
Here's a function to achieve this:
这是实现此目的的函数：
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', $testCases));
Output:
输出：
array(5) { [0]=> int(13) [1]=> int(13) [2]=> int(13312) [3]=> int(10752) [4]=> NULL } int(1)
数组(5) { [0]=> int(13) [1]=> int(13) [2]=> int(13312) [3]=> int(10752) [4]=> NULL } int( 1)
回答by Kristian Williams
function toByteSize($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]);
}
回答by Eugene Kuzmenko
Here's what I've come up with so far, that I think is a much more elegant solution:
到目前为止，这是我想出的，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);
}
回答by Steve Buzonas
I use a function to determine the memory limit set for PHP in some cron scripts that looks like:
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')));
}
A similar approach that will work better with floats and accept the two letter abbreviation would be something like:
一种类似的方法可以更好地处理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($unit), array(1 => 'kb','mb','gb','tb'))));
}
回答by Hiendv
<?php
function byteconvert($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($foo)." byte";
?>
回答by CubicleSoft
Wanting something similar to this and not quite liking the other solutions posted here for various reasons, I decided to write my own function:
想要类似的东西并且由于各种原因不太喜欢这里发布的其他解决方案，我决定编写自己的函数：
function ConvertUserStrToBytes($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 $num;
}
It adapts a few of the ideas presented here by Al Jey (whitespace handling) and John V (switch-case) but without the regex, doesn't call pow(), lets switch-case do its thing when there aren't breaks, and can handle some weird user inputs (e.g. " 123 wonderful KB " results in 125952). I'm sure there is a more optimal solution that involves fewer instructions but the code would be less clean/readable.
它改编了 Al Jey（空白处理）和 John V（switch-case）在此处提出的一些想法，但没有正则表达式，不调用 pow()，让 switch-case 在没有中断时做它的事情，并且可以处理一些奇怪的用户输入（例如“ 123 KB ”结果为 125952）。我确信有一个更优化的解决方案，它涉及更少的指令，但代码会不太干净/可读。
回答by MingalevME
One more solution (IEC):
另一种解决方案（IEC）：
<?php
class Filesize
{
const UNIT_PREFIXES_POWERS = [
'B' => 0,
'' => 0,
'K' => 1,
'k' => 1,
'M' => 2,
'G' => 3,
'T' => 4,
'P' => 5,
'E' => 6,
'Z' => 7,
'Y' => 8,
];
public static function humanize($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) . $multiple;
}
// ...
}
Source:
来源：
https://github.com/mingalevme/utils/blob/master/src/Filesize.phphttps://github.com/mingalevme/utils/blob/master/tests/FilesizeTest.php
https://github.com/mingalevme/utils/blob/master/src/Filesize.php https://github.com/mingalevme/utils/blob/master/tests/FilesizeTest.php
回答by user2900575
I know this is a relative old topic, but here's a function that I sometimes have to use when I need this kind of stuff; You may excuse for if the functions dont work, I wrote this for hand in a mobile:
我知道这是一个相对较旧的话题，但这里有一个函数，当我需要这类东西时，有时必须使用它；如果功能不起作用，你可以原谅，我在手机上写了这个：
function intobytes($bytes, $stamp = 'b') {
$indx = array_search($stamp, array('b', 'kb', 'mb', 'gb', 'tb', 'pb', 'yb'));
if ($indx > 0) {
return $bytes * pow(1024, $indx);
}
return $bytes;
}
and as compact
和紧凑的
function intobytes($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;}
Take care!
小心！
Brodde85 ;)
布罗德85 ;)
