從數據庫不能正常工作的動態創建

Question

我建立了一個PHP 5和MySQL的網站，其中有一張表格，用於跟蹤預定的照片拍攝。我想將這些預定「事件」的提要推送到一個ical文件中。

我原本asked this question，並從S. Gehrig得到了很好的回答。我有一個示例文件正在工作，並且每當我在Dreamweaver中手動調整文件時，都會定期在Google日曆中進行更新。但是，現在我已經添加了從數據庫中動態獲取PHP的功能，它將無法工作。

這裏的PHP：

<?php 
require_once('../../_includes/initialize.php'); 

$ical = " BEGIN:VCALENDAR 
VERSION:2.0 
PRODID:-//hacksw/handcal//NONSGML v1.0//EN "; 

$slots = Slot::find_all(); 
foreach($slots as $slot) { 
    $job = Job::find_by_id($slot->job_id); 

    $start_stamp = strtotime($slot->start); 
    $end_stamp = strtotime($slot->endtime); 
    $dtstart = gmdate('Ymd', $start_stamp).'T'. gmdate('His', $start_stamp) . "Z"; // converts to UTC time 
    $dtend = gmdate('Ymd', $end_stamp).'T'. gmdate('His', $end_stamp) . "Z"; // converts to UTC time 

    $summary = $job->title; 

    $ical .= " BEGIN:VEVENT 
    UID:" . $slot->id . "@homewoodphoto.jhu.edu 
    DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z 
    DTSTART:" . $dtstart . " 
    DTEND:" . $dtend . " 
    SUMMARY:" . $summary . " 
    END:VEVENT "; 
} 

$ical .= " END:VCALENDAR"; 

//set correct content-type-header 
header('Content-type: text/calendar; charset=utf-8'); 
header('Content-Disposition: inline; filename=homewoodphoto_master.ics'); 
echo $ical; 
exit; 

?> 

這個文件的輸出是完全一樣的說明書，硬編碼的版本，我有工作，據我可以告訴。任何人都可以看到爲什麼這不工作？

PS下面是正在工作的文件的代碼 - 我只是將它發佈到我的服務器上，並通過Google日曆中的URL進行了訂閱。當我在第二場比賽中進行硬編碼時，它很快出現在Google日曆中。

<?php 

$ical = "BEGIN:VCALENDAR 
VERSION:2.0 
PRODID:-//hacksw/handcal//NONSGML v1.0//EN 

BEGIN:VEVENT 
UID:" . md5(uniqid(mt_rand(), true)); . "@yourhost.test 
DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z 
DTSTART:20090925T170000Z 
DTEND:20090928T035959Z 
SUMMARY:Bastille Day Party 
END:VEVENT 

BEGIN:VEVENT 
UID:" . md5(uniqid(mt_rand(), true)); . "@yourhost.test 
DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z 
DTSTART:20090929T170000Z 
DTEND:20090930T035959Z 
SUMMARY:Camping Trip 
END:VEVENT 

END:VCALENDAR"; 

//set correct content-type-header 
header('Content-type: text/calendar; charset=utf-8'); 
header('Content-Disposition: inline; filename=calendar.ics'); 

echo $ical; 

exit; 

?> 

幫助！

評論者建議我通過刪除標題並回顯$ ical var進行測試。以下是該測試的結果，爲方便您添加換行符：

BEGIN:VCALENDAR 
VERSION:2.0 
PRODID:-//hacksw/handcal//NONSGML v1.0//EN 
BEGIN:VEVENT 
UID:21@homewoodphoto.jhu.edu 
DTSTAMP:20090929T212141Z 
DTSTART:20091001T230000Z 
DTEND:20091001T230000Z 
SUMMARY:little title 
END:VEVENT 
BEGIN:VEVENT 
UID:22@homewoodphoto.jhu.edu 
DTSTAMP:20090929T212141Z 
DTSTART:20090926T230000Z 
DTEND:20090927T010000Z 
SUMMARY:A big photo shoot 
END:VEVENT 
BEGIN:VEVENT 
UID:23@homewoodphoto.jhu.edu 
DTSTAMP:20090929T212141Z 
DTSTART:20091003T230000Z 
DTEND:20091004T010000Z 
SUMMARY:A big photo shoot 
END:VEVENT 
END:VCALENDAR 

謝謝！

Answer 1

感謝穆罕默德的幫助下，我們推斷，這是縮進代碼添加到空白是造成錯誤的ics文件。 M建議使用\ n換行符不起作用，但手動按Enter鍵來創建換行符，但不縮進下一行，似乎已經完成了。下面是工作代碼：

<?php 
require_once('../../_includes/initialize.php'); 

$ical = "BEGIN:VCALENDAR 
VERSION:2.0 
PRODID:-//hacksw/handcal//NONSGML v1.0//EN 
"; 

$slots = Slot::find_all(); 
foreach($slots as $slot) { 
$job = Job::find_by_id($slot->job_id); 

$start_stamp = strtotime($slot->start); 
$end_stamp = strtotime($slot->endtime); 
$dtstart = gmdate('Ymd', $start_stamp).'T'. gmdate('His', $start_stamp) . "Z"; // converts to UTC time 
$dtend = gmdate('Ymd', $end_stamp).'T'. gmdate('His', $end_stamp) . "Z"; // converts to UTC time 

$summary = $job->title; 

$ical .= "BEGIN:VEVENT 
UID:" . $slot->id . "@homewoodphoto.jhu.edu 
DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z 
DTSTART:" . $dtstart . " 
DTEND:" . $dtend . " 
SUMMARY:" . $summary . " 
END:VEVENT 
"; 
} 

$ical .= "END:VCALENDAR"; 

//set correct content-type-header 
header('Content-type: text/calendar; charset=utf-8'); 
header('Content-Disposition: inline; filename=homewoodphoto_master.ics'); 
echo $ical; 
exit; 
?> 

Answer 2

初步猜測會是你的數組沒有正確填充。所以要測試它，我將開始刪除

//set correct content-type-header 
header('Content-type: text/calendar; charset=utf-8'); 
header('Content-Disposition: inline; filename=homewoodphoto_master.ics'); 

並更改$ slots = Slot :: find_all（）;到

$slots = Slot::find_all(); 
print_r($slots); 

確保您的對象數組正在設置。

然後從命令行或瀏覽器運行它，以確保其在提交給Google之前按預期輸出。

嘗試下面的代碼，以避免空白：

<?php 
require_once('../../_includes/initialize.php'); 

$ical = "BEGIN:VCALENDAR\nVERSION:2.0\nPRODID:-//hacksw/handcal//NONSGML v1.0//EN"; 

$slots = Slot::find_all(); 
foreach($slots as $slot) { 
    $job = Job::find_by_id($slot->job_id); 

    $start_stamp = strtotime($slot->start); 
    $end_stamp = strtotime($slot->endtime); 
    $dtstart = gmdate('Ymd', $start_stamp).'T'. gmdate('His', $start_stamp) . "Z"; // converts to UTC time 
    $dtend = gmdate('Ymd', $end_stamp).'T'. gmdate('His', $end_stamp) . "Z"; // converts to UTC time 

    $summary = $job->title; 

    $ical .= "BEGIN:VEVENT\n"; 
    $ical .= "UID:" . $slot->id . "@homewoodphoto.jhu.edu\n"; 
    $ical .= "DTSTAMP:" . gmdate('Ymd').'T'. gmdate('His') . "Z\n"; 
    $ical .= "DTSTART:" . $dtstart . "\n"; 
    $ical .= "DTEND:" . $dtend . "\n"; 
    $ical .= "SUMMARY:" . $summary . "\n"; 
    $ical .= "END:VEVENT\n"; 
} 

$ical .= "\nEND:VCALENDAR"; 

//set correct content-type-header 
header('Content-type: text/calendar; charset=utf-8'); 
header('Content-Disposition: inline; filename=homewoodphoto_master.ics'); 
echo $ical; 
exit; 

?> 

Answer 3

對於誰通過搜索這個絆倒人的問題是如何解決的，可能不是很清楚。基本上，iCal規範要求\ r \ n用於換行符，並且在行首沒有空格，這是腳本中修復的使其工作的原因。

當與iCal工作，我已經找到了以下3個驗證是最有幫助的：

最基本的（未命中空格）：http://severinghaus.org/projects/icv/?url=

這個人會趕上空白：http://icalvalid.cloudapp.net/Default.aspx

這一個會抓住別人沒有的東西，但幾乎是太嚴格了：http://arnout.engelen.eu/icalendar-validator

此外，所有不同元素的最佳文檔：http://www.kanzaki.com/docs/ical/