使用 strtotime 转换为日期，输出始终为空并带有特殊字符

Question

我试图在这个日期中剪切特殊字符，当我尝试使用 strtotime 转换为日期时，输出始终为空。但在另一个日期它的工作。为什么？

数据特殊字符：

Â  Â 11:44:08 AM 10/24/2012Â  Â 
Â  Â 3:37:43 PM 9/8/2012Â  Â 
Â  Â 13:21:22 09/01/2017Â  Â
Â  Â 0:30:06 13/09/2017Â  Â
Â  Â 0:32:00 13/09/2017Â  Â

日期示例：

11:44:08 AM 10/24/2012 
3:37:43 PM 9/8/2012 
13:21:22 09/01/2017 
0:30:06 13/09/2017 
0:32:00 13/09/2017

转换为 strotime ：

1351071848
1347111463
1504264882
empty *mean nothing 
empty

代码：

$test  = preg_replace("/[^0-9a-zA-Z \/:\-]/", "", $date);
$xtime = strtotime($date);
$result   = date("Y-m-d H:i:s",$xtime);

最终结果：

2012-10-24 11:44:08
2012-09-08 15:37:43
2017-09-01 13:21:22
1970-01-01 01:00:00
1970-01-01 01:00:00

Answer 1

基于these strtotime notes:

Dates in the m/d/y or d-m-y formats are disambiguated by looking at the separator between the various components: 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. If, however, the year is given in a two digit format and the separator is a dash (-), the date string is parsed as y-m-d.

您可以尝试以下逻辑，如果需要可以进一步扩展：

$arr = ['Â  Â 11:44:08 AM 10/24/2012Â  Â','Â  Â 3:37:43 PM 9/8/2012Â  Â ','Â  Â 13:21:22 09/01/2017Â  Â','Â  Â 0:30:06 13/09/2017Â  Â','Â  Â 0:32:00 13/09/2017Â  Â'];
foreach ($arr as $date){
    $test  = preg_replace("~[^0-9a-zA-Z\s/:-]+~u", "", $date);
    $result = $test." => ";
    if (($xtime = strtotime($test)) === false) // European dd/MM/yyyy format?
    { 
        if (($xtime = strtotime(str_replace('/', '-', $test))) === false) {
            $result .= "UNKNOWN FORMAT"; // add more logic here if need be
        } else {
            $result .= date("Y-m-d H:i:s", $xtime);
        }
    }
    else { // OK, it is MM/dd/yyyy
        $result .= date("Y-m-d H:i:s",$xtime);
    }
    echo $result."\n";
}

输出：

11:44:08 AM 10/24/2012   => 2012-10-24 11:44:08
3:37:43 PM 9/8/2012    => 2012-09-08 15:37:43
13:21:22 09/01/2017   => 2017-09-01 13:21:22
0:30:06 13/09/2017   => 2017-09-13 00:30:06
0:32:00 13/09/2017   => 2017-09-13 00:32:00

使用 strtotime 转换为日期，输出始终为空并带有特殊字符

convert to date with strtotime, the output always empty with special char

php

regex

preg-replace

preg-match-all

preg-match