问题
I encountered with this question today on StackOverflow but didn't get answer.
My question is
echo date('Y-m-d',strtotime('2012-september-09')); // output - 2012-09-01
echo date('Y-m-d',strtotime('09-september-2012')); // output - 2012-09-09
Codepad
I am confused that why the first format don't produce correct answer. Any Help?
回答1:
From the manual:
if the separator is a slash (/), then the American m/d/y is assumed; whereas if the separator is a dash (-) or a dot (.), then the European d-m-y format is assumed.
回答2:
This is not behavior of the date function but of the strtotime. strtotime can handle only dates in specific formats listed on the Date Formats manual page. 09-september-2012 is in the dd ([ \t.-])* m ([ \t.-])* y format listed there, but 2012-september-09 does not match any of the supported formats.
回答3:
I think in your code,
echo date('Y-m-d',strtotime('2012-september-09'));
strtotime('2012-september-09') is not a valid format ('2012-september-09') for strtotime() date function.
refer this link http://www.php.net/manual/en/datetime.formats.date.php
来源：https://stackoverflow.com/questions/12278943/strange-behavior-of-date-function