大数？ [英] Large Numbers?

问题描述

我可以在PHP中使用的最大数字（整数？）

是多少？


例如，我有这个数字：


1082655076035


这实际上是我需要的日期

与其他日期比较。


我只是想知道一个人是否比另一个人更好

但是好像没有工作的b $ b。


我可以尝试将它转换为日期对象，如果

这是唯一的方法...


谢谢，


Andrew

What is the largest number (integer?)
that I can work with in PHP?

For example, I have this number:

1082655076035

This is actually a date that I need to
compare with another date.

I was just going to see if one was greater
than the other but it doesn''t seem to be
working.

I can try to convert it to a date object if
that is the only way to do it...

Thanks,

Andrew

推荐答案

Andrew写道：

我可以在PHP中使用的最大数字（整数？）


例如，我有这个数字：

1082655076035

这实际上是一个我需要和另一个约会比较的日期。

我只是想看看哪一个比另一个更好
但是它似乎不是
我可以尝试将它转换为日期对象，如果
这是唯一的方法...

谢谢，

Andrew

What is the largest number (integer?)
that I can work with in PHP?

For example, I have this number:

1082655076035

This is actually a date that I need to
compare with another date.

I was just going to see if one was greater
than the other but it doesn''t seem to be
working.

I can try to convert it to a date object if
that is the only way to do it...

Thanks,

Andrew

根据几乎所有平台的定义，INTEGER是32位（4字节）或

最大值2亿你的号码是> 1亿美元。


来自：
http://www.php.net/manual/en/language.types.integer.php


" ;整数的大小取决于平台，尽管大约20亿的最大值是大约20亿美元（通常是32位签名）。 PHP

不支持无符号整数。


你想使用浮动

http://www.php.net/manual/en/language.types.float。 php


"浮动的大小取决于平台，但最大值为
~1.8e308，精度约为14十进制数字是一个常见值

（即64位IEEE格式）。


Michael Austin。

By definition on almost all platforms INTEGER is 32 bits (4 bytes) or a
maximum of 2Billion your number is > 1Trillion.

from:

http://www.php.net/manual/en/language.types.integer.php

"The size of an integer is platform-dependent, although a maximum value
of about two billion is the usual value (that''s 32 bits signed). PHP
does not support unsigned integers."

you want to use float

http://www.php.net/manual/en/language.types.float.php

"The size of a float is platform-dependent, although a maximum of
~1.8e308 with a precision of roughly 14 decimal digits is a common value
(that''s 64 bit IEEE format)."

Michael Austin.

Andrew写道：

Andrew wrote:

我可以在PHP中使用的最大数字（整数？）
是什么？
例如，我有这个号码：

1082655076035

这实际上是我需要与其他日期进行比较的日期。

我可以尝试将它转换为日期对象如果
这是唯一的方法...

谢谢，

安德鲁

What is the largest number (integer?)
that I can work with in PHP?

For example, I have this number:

1082655076035

This is actually a date that I need to
compare with another date.

I was just going to see if one was greater
than the other but it doesn''t seem to be
working.

I can try to convert it to a date object if
that is the only way to do it...

Thanks,

Andrew

....忘记提及大多数系统现在使用64位日期/时间...


如果你认为我错了2 ^ 32是2147483648 ，整数是

签名 - 换句话说它是2 ^ 31而第32位是+/-。


2 ^ 32是4294967296

2 ^ 64是18446744073709551616

差别很大......


迈克尔。

.... forgot to mention that most systems now use 64 bits for date/time...

and if you are thinking I was wrong that 2^32 is 2147483648, integer is
signed - in otherwords it is 2^31 and the 32nd bit is for +/-.

2^32 is 4294967296

2^64 is 18446744073709551616

Big difference...

Michael.

在文章< UU ***************** @newssvr23.news.prodigy.com> ，迈克尔·奥斯汀写道：

In article <UU*****************@newssvr23.news.prodigy.com> , Michael Austin wrote:

如果你认为我错了2 ^ 32是2147483648，整数是
签名 - 换句话说它是2 ^ 31而第32位是+ /-.

and if you are thinking I was wrong that 2^32 is 2147483648, integer is
signed - in otherwords it is 2^31 and the 32nd bit is for +/-.

我认为你在这里弄错了。

补充符号，如第一个（2 ^ 32）/ 2代表一个正整数

和最后一个（2 ^ 32）/ 2表示负整数。


-

Tim Van Wassenhove < http://home.mysth.be/~timvw>

I think you are mistaken here.
Complement notation, as in the first (2^32)/2 represent a positive integer
and the last (2^32)/2 represent a negative integer.

--
Tim Van Wassenhove <http://home.mysth.be/~timvw>

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