PHP 搞砸 XML 文件

Question

我有一个应用程序，我在其中将 $POST 发送到 php 脚本，目的是向 XML 文件添加新项目。每隔一段时间，XML 就会添加一堆空白字段，导致无法正确解析。 XML 的结尾如下所示：

<item><first_name/><last_name/><title/><date/><anonymous/><prayer_warriors>0</prayer_warriors><location/><description/><iostoken/></item>

我使用的脚本如下：

<?php
$firstName = $_POST['firstName'];
 $lastName = $_POST['lastName'];
 $request = $_POST['request'];
 $anon = $_POST['anon'];
 $pubDate = $_POST['pubDate'];
 $loc = $_POST['loc'];
 $des = $_POST['des'];
 $iostoken = $_POST['iostoken'];
//This line will load the XML file
$xml = simplexml_load_file("http://Test.xml") or die("Not loaded!\n");
//print_r($xml);
//This line gets the channel element (from an array returned by the xpath method) 
$channel = $xml->xpath('//channel'); 
$channel = $channel[0];
//print_r($channel);
$person = $channel->addChild("item");
$person->addChild("first_name", $firstName);
$person->addChild("last_name", $lastName);
$person->addChild("title", $request);
$person->addChild("date", $pubDate);
$person->addChild("anonymous", $anon);
$person->addChild("prayer_warriors", "0");
$person->addChild("location", $loc);
$person->addChild("description", $des);
$person->addChild("iostoken", $iostoken);

//This next line will overwrite the original XML file with new data added
$xml->asXML("Test.xml");
?>

这个脚本有什么错误会导致空标签吗？

$_POST 来自我为此构建的应用程序发送的信息。基本上，我有名字、姓氏、设备令牌、祈祷请求、标题和描述以及日期的文本字段，它使用 PHP 获取这些字段并将它们放入 XML 文件中。 PHP 可以工作，因为我可以在这些字段中输入文本并编辑 XML，但每隔一段时间它会在最后添加它，我的应用程序将无法解析并崩溃。

我在应用程序中的解析器如下所示：

- (void)parseRss:(GDataXMLElement *)rootElement entries:(NSMutableArray *)entries {

    NSArray *channels = [rootElement elementsForName:@"channel"];
    for (GDataXMLElement *channel in channels) {

        NSString *blogTitle = [channel valueForChild:@"title"];

        NSArray *items = [channel elementsForName:@"item"];
        for (GDataXMLElement *item in items) {

            NSString *firstName = [item valueForChild:@"first_name"];
            NSString *lastName = [item valueForChild:@"last_name"];
            NSString *articleDateString = [item valueForChild:@"date"];
            NSDate *articleDate = [NSDate dateFromInternetDateTimeString:articleDateString formatHint:DateFormatHintRFC822];
            int daysToAdd = 7;
            NSDate *newDate1 = [articleDate dateByAddingTimeInterval:60*60*24*daysToAdd];
            NSString *anonymous = [item valueForChild:@"anonymous"];
            NSString *prayerRequest = [item valueForChild:@"title"];
            NSString *prayerWarriors = [item valueForChild:@"prayer_warriors"];
            NSString *location = [item valueForChild:@"location"];
            NSString *details = [item valueForChild:@"description"];
            NSString *devicestoken = [item valueForChild:@"iostoken"];
            NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
            [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
            [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
            NSString *dateofarticle = [dateFormatter stringFromDate:articleDate];
            NSString *expirationDate = [dateFormatter stringFromDate:newDate1];
            NSDate *today = [NSDate date];
            NSComparisonResult result = [today compare:articleDate];
            NSString *bodyoftext = [[[[[[@"<b><font size=5><div align=\"left\">" stringByAppendingString:prayerRequest] stringByAppendingString:@"</font></b><font size=3><p style=\"color:#989898\">"] stringByAppendingString:@"Expires " ] stringByAppendingString:expirationDate] stringByAppendingString:@"</div></p>"] stringByAppendingString:details];

            RSSEntry *entry = [[[RSSEntry alloc] initWithBlogTitle:blogTitle firstName:firstName lastName:lastName articleDate:articleDate prayerRequest:prayerRequest anonymous:anonymous prayerWarriors:prayerWarriors location:location details:bodyoftext expiresDate:newDate1 iostoken:devicestoken] autorelease];
            switch (result)
            {
                case NSOrderedAscending:
                    NSLog(@"Future Date");
                    break;
                case NSOrderedDescending:


                    [entries addObject:entry];
                    NSLog(@"Earlier Date");
                    break;
                case NSOrderedSame:


                    [entries addObject:entry];
                    NSLog(@"Today/Null Date Passed"); //Not sure why This is case when null/wrong date is passed
                    break;
                default:
                    NSLog(@"Error Comparing Dates");
                    break;
            }


        }
    }

}

Answer 1

您的 $_POST 似乎是空的或不包含您认为的结构。由于pray_warriors 在XML 中正确地具有0 值，因此看起来$firstName、$lastName、$request 等是空变量。你能做一个调试打印，比如 print_r($_POST) 看看它是什么样子的吗？

另外，正如@developerwjk 在评论中提到的，<tagname /> 是完全有效的 XML。如果您尝试使用正则表达式或任何非 XML 解析器来解析 XML 结构，请立即停止并使用 XML 解析器。