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
等等...
编辑:哇。4年前我问过这个问题。这种事情真的会告诉你随着时间的推移你有多大的进步!
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
等等...
编辑:哇。4年前我问过这个问题。这种事情真的会告诉你随着时间的推移你有多大的进步!
这是实现此目的的功能:
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', $testCases));
输出:
数组(5) { [0]=> int(13) [1]=> int(13) [2]=> int(13312) [3]=> int(10752) [4]=> NULL } int( 1)
function toByteSize($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,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);
}
我使用一个函数来确定在一些 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')));
}
一种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,例如:
function byteconvert($value) {
preg_match('/(.+)(.{2})$/', $value, $matches);
list($_,$value,$unit) = $matches;
return (int) ($value * pow(1024, array_search(strtolower($unit), array(1 => 'kb','mb','gb','tb'))));
}
<?php
function byteconvert($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($foo)." byte";
?>
想要类似的东西并且由于各种原因不太喜欢这里发布的其他解决方案,我决定编写自己的函数:
function ConvertUserStrToBytes($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;
}
它采用了 Al Jey(空白处理)和 John V(switch-case)在此提出的一些想法,但没有正则表达式,不调用 pow(),让 switch-case 在没有中断时执行其操作,并且可以处理一些奇怪的用户输入(例如,“123 wonderful KB”的结果为 125952)。我确信有一个更优化的解决方案,它涉及更少的指令,但代码会不那么干净/可读。
基于https://stackoverflow.com/a/17364338/1041470
改进:
/**
* 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]));
}
我只是在寻找这个函数,并接受了挑战,试图改进它并将它变成两行:) 使用与 Eugene 类似的正则表达式来验证/提取值,但避免使用 switch 语句。可以接受长 '10MB'、'10mb' 和短 '10M'、'10m' 值、十进制值并始终返回整数。无效的字符串返回 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 ));
}
我知道这是一个相对古老的话题,但是当我需要这种东西时,我有时不得不使用这个功能;如果功能不起作用,您可以原谅,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 $bytes;
}
和紧凑
function intobytes($bytes, $stamp='b') {$indx=array_search($stamp,array('b','kb','mb','gb','tb','pb','yb'));if($indx > 0){return $bytes * pow(1024,$indx);} return $bytes;}
小心!
布罗德85 ;)
另一种解决方案(IEC):
<?php
class Filesize
{
const UNIT_PREFIXES_POWERS = [
'B' => 0,
'' => 0,
'K' => 1,
'k' => 1,
'M' => 2,
'G' => 3,
'T' => 4,
'P' => 5,
'E' => 6,
'Z' => 7,
'Y' => 8,
];
public static function humanize($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;
}
// ...
}
资源:
https://github.com/mingalevme/utils/blob/master/src/Filesize.php https://github.com/mingalevme/utils/blob/master/tests/FilesizeTest.php
根据标准,这是一个更干净的版本(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]);
}