在5.2中的php dateTime :: createFromFormat？

Question

我一直在开发php 5.3.

但是我们的生产服务器是5.2.6.

我一直在用

$schedule = '31/03/2011 01:22 pm'; // example input
if (empty($schedule))
    $schedule = date('Y-m-d H:i:s');
else {
    $schedule = dateTime::createFromFormat('d/m/Y h:i a', $schedule);
    $schedule = $schedule->format('Y-m-d H:i:s');
}
echo $schedule;

但是,5.2中没有该功能

解决这个问题的最简单方法是什么(没有机会进行php升级).

Answer 1

只需包含下一个代码

function DEFINE_date_create_from_format()
  {

function date_create_from_format( $dformat, $dvalue )
  {

    $schedule = $dvalue;
    $schedule_format = str_replace(array('Y','m','d', 'H', 'i','a'),array('%Y','%m','%d', '%I', '%M', '%p' ) ,$dformat);
    // %Y, %m and %d correspond to date()'s Y m and d.
    // %I corresponds to H, %M to i and %p to a
    $ugly = strptime($schedule, $schedule_format);
    $ymd = sprintf(
        // This is a format string that takes six total decimal
        // arguments, then left-pads them with zeros to either
        // 4 or 2 characters, as needed
        '%04d-%02d-%02d %02d:%02d:%02d',
        $ugly['tm_year'] + 1900,  // This will be "111", so we need to add 1900.
        $ugly['tm_mon'] + 1,      // This will be the month minus one, so we add one.
        $ugly['tm_mday'], 
        $ugly['tm_hour'], 
        $ugly['tm_min'], 
        $ugly['tm_sec']
    );
    $new_schedule = new DateTime($ymd);

   return $new_schedule;
  }
}

if( !function_exists("date_create_from_format") )
 DEFINE_date_create_from_format();

Answer 2

因为strtotime在面对D/M/Y时表现不佳而且date_create_from_format不可用,strptime可能是你唯一的希望.它做了一些相当古老的学校的事情,比如处理多年,好像它们是自1900年以来的年数,处理几个月,好像一月是零月.这是一些可怕的示例代码,用于sprintf将日期重新组合成DateTime理解的内容:

$schedule = '31/03/2011 01:22 pm';
// %Y, %m and %d correspond to date()'s Y m and d.
// %I corresponds to H, %M to i and %p to a
$ugly = strptime($schedule, '%d/%m/%Y %I:%M %p');
$ymd = sprintf(
    // This is a format string that takes six total decimal
    // arguments, then left-pads them with zeros to either
    // 4 or 2 characters, as needed
    '%04d-%02d-%02d %02d:%02d:%02d',
    $ugly['tm_year'] + 1900,  // This will be "111", so we need to add 1900.
    $ugly['tm_mon'] + 1,      // This will be the month minus one, so we add one.
    $ugly['tm_mday'], 
    $ugly['tm_hour'], 
    $ugly['tm_min'], 
    $ugly['tm_sec']
);
echo $ymd;
$new_schedule = new DateTime($ymd);
echo $new_schedule->format('Y-m-d H:i:s');

如果有效,您应该看到相同,正确的日期和时间打印两次.

Answer 3

我认为扩展DateTime类并createFromFormat()像这样实现自己要简洁得多: -

class MyDateTime extends DateTime
{
    public static function createFromFormat($format, $time, $timezone = null)
    {
        if(!$timezone) $timezone = new DateTimeZone(date_default_timezone_get());
        $version = explode('.', phpversion());
        if(((int)$version[0] >= 5 && (int)$version[1] >= 2 && (int)$version[2] > 17)){
            return parent::createFromFormat($format, $time, $timezone);
        }
        return new DateTime(date($format, strtotime($time)), $timezone);
    }
}

$dateTime = MyDateTime::createFromFormat('Y-m-d', '2013-6-13');
var_dump($dateTime);
var_dump($dateTime->format('Y-m-d'));

这适用于所有版本的PHP> = 5.2.0.

请参阅此处获取演示http://3v4l.org/djucq