如何在 PHP 正则表达式中解析来自 Facebook 事件的 Ical 文件？

Question

我正在尝试解析此数据中的 Summary 和 DTSTART 字段并考虑使用正则表达式。还尝试逐行阅读，但无法解决实现它的逻辑。

有人帮忙吗？

已经有解析器了，但我的要求有点独特，需要不同的目标实现。

BEGIN:VCALENDAR
PRODID:-//Facebook//NONSGML Facebook Events V1.0//EN
X-WR-CALNAME:Friends' birthdays
X-PUBLISHED-TTL:PT12H
X-ORIGINAL-URL:/events/birthdays/
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART:20170106
SUMMARY:Gys's birthday
RRULE:FREQ=YEARLY
DURATION:P1D
UID:b1074083@facebook.com
END:VEVENT
BEGIN:VEVENT
DTSTART:20130406
SUMMARY:Geo's birthday
RRULE:FREQ=YEARLY
DURATION:P1D
UID:b1004@facebook.com
END:VEVENT
BEGIN:VEVENT
DTSTART:20120602
SUMMARY:Flo's birthday
RRULE:FREQ=YEARLY
DURATION:P1D
UID:b100895@facebook.com
END:VEVENT

Answer 1

此代码将所有文件读入一个数组（使用 file()），然后一次处理每一行。每行被分成标签和内容部分，然后根据它是什么标签，它会临时存储数据或将累积的内容添加到整个日历数组中。 ...

$file = "a.txt";
$calendar = [];
$lines = file($file, FILE_IGNORE_NEW_LINES);
$temp = [];
$type = "";
foreach ( $lines as $line ) {
    list($tag,$content) = explode(":", $line);
    if ( $tag == "END" )    {
        $calendar[$type][] = $temp;
        $temp = [];
    }
    else if ( $tag == "BEGIN" )   {
        // If already some content, then store it in calendar and reset
        if ( count($temp) > 0 ) {
            $calendar[$type][] = $temp;
            $temp = [];
        }
        $type = $content;
    }
    else    {
        $temp[$tag] = $content;
    }
}

它使用BEGIN标签内容将文件各部分的事件存储在一起，配合示例数据文件它会给...

Array
(
    [VCALENDAR] => Array
        (
            [0] => Array
                (
                    [PRODID] => -//Facebook//NONSGML Facebook Events V1.0//EN
                    [X-WR-CALNAME] => Friends' birthdays
                    [X-PUBLISHED-TTL] => PT12H
                    [X-ORIGINAL-URL] => /events/birthdays/
                    [VERSION] => 2.0
                    [CALSCALE] => GREGORIAN
                    [METHOD] => PUBLISH
                )

        )

    [VEVENT] => Array
        (
            [0] => Array
                (
                    [DTSTART] => 20170106
                    [SUMMARY] => Gys's birthday
                    [RRULE] => FREQ=YEARLY
                    [DURATION] => P1D
                    [UID] => b1074083@facebook.com
                )

            [1] => Array
                (
                    [DTSTART] => 20130406
                    [SUMMARY] => Geo's birthday
                    [RRULE] => FREQ=YEARLY
                    [DURATION] => P1D
                    [UID] => b1004@facebook.com
                )

            [2] => Array
                (
                    [DTSTART] => 20120602
                    [SUMMARY] => Flo's birthday
                    [RRULE] => FREQ=YEARLY
                    [DURATION] => P1D
                    [UID] => b100895@facebook.com
                )

        )

)

如何在 PHP 正则表达式中解析来自 Facebook 事件的 Ical 文件？

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