检查字符串是否为unix时间戳 [英] Check whether the string is a unix timestamp
问题描述
我有一个字符串,我需要找出是否是一个unix时间戳记,我该怎么做有效?
I have a string and I need to find out whether it is a unix timestamp or not, how can I do that effectively?
我发现这个线程通过谷歌,但它没有提出一个非常坚实的答案,我害怕(是的,我从上述线索的原始海报中提出了这个问题)。
I found this thread via Google, but it doesn't come up with a very solid answer, I'm afraid. (And yes, I cribbed the question from the original poster on the aforementioned thread).
推荐答案
好的,有一段时间,我用 date('U')
撤回解决方案,建议使用这个代替:
Ok, after fiddling with this for some time, I withdraw the solution with date('U')
and suggest to use this one instead:
function isValidTimeStamp($timestamp)
{
return ((string) (int) $timestamp === $timestamp)
&& ($timestamp <= PHP_INT_MAX)
&& ($timestamp >= ~PHP_INT_MAX);
}
只有给定的 $时间戳
是字符串,仅由数字和可选的减号组成。该数字也必须在整数的位范围内(编辑:实际上不必要,如下所示)。
This check will only return true if the given $timestamp
is a string and consists solely of digits and an optional minus character. The number also has to be within the bit range of an integer (EDIT: actually unneeded as shown here).
var_dump( isValidTimeStamp(1) ); // false
var_dump( isValidTimeStamp('1') ); // TRUE
var_dump( isValidTimeStamp('1.0') ); // false
var_dump( isValidTimeStamp('1.1') ); // false
var_dump( isValidTimeStamp('0xFF') ); // false
var_dump( isValidTimeStamp('0123') ); // false
var_dump( isValidTimeStamp('01090') ); // false
var_dump( isValidTimeStamp('-1000000') ); // TRUE
var_dump( isValidTimeStamp('+1000000') ); // false
var_dump( isValidTimeStamp('2147483648') ); // false
var_dump( isValidTimeStamp('-2147483649') ); // false
检查PHP_INT_MAX是确保您的字符串可以正确使用 date
和喜欢,例如它确保这不会发生*:
The check for PHP_INT_MAX is to ensure that your string can be used correctly by date
and the likes, e.g. it ensures this doesn't happen*:
echo date('Y-m-d', '2147483648'); // 1901-12-13
echo date('Y-m-d', '-2147483649'); // 2038-01-19
在64位系统上,整数当然大于该值,函数将不会再为2147483648和-2147483649返回假,但对应的较大数字。
On 64bit systems the integer is of course larger than that and the function will no longer return false for "2147483648" and "-2147483649" but for the corresponding larger numbers.
(*)注意:我不是100%肯定的,这个位范围对应于可以使用的日期
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