在PHP中解析和编辑XML文件 [英] Parse and edit XML file in PHP

问题描述

如何对PHP中的XML文件进行以下编辑.我基本上想保留一些元素并将这些元素写入新的XML文件.

How can I do the following edits to an XML file in PHP. I basically want to keep some elements and write those elements to a new XML file.

因此，我知道如何打开新文件并为编写做准备，然后打开XML文件并逐行进行遍历:

So, I know how to open the new file and prepare it for writing and then open the XML file and iterate through it line by line:

$lines = fopen("file.xml", "r");
$new = fopen("newFile.xml", "w");
foreach($lines as $line){

    /* operations on each line here */
}

我不想对每一行进行操作，而是对file.xml中的某些元素进行操作.

I don't want to do operations on each line, but on certain elements in the file.xml.

我需要为每个<doc>元素(<doc>和</doc>之间的所有元素):

What I need to do is for each <doc> element (everything in between <doc> and </doc>):

1. echo "<doc>"并在$ new中换行.
2. 编写介于<title>和</title>之间的所有内容，包括$ new的标签.
3. 编写介于<url>和</url>之间的所有内容，包括$ new的标签.
4. 编写<abstract>和<abstract>之间的所有内容，包括$ new的标签.
5. echo "</doc>"并换行.

1. echo "<doc>" and break to a new line in $new.
2. write everything in between <title> and </title> including the tags to $new.
3. write everything in between <url> and </url> including the tags to $new.
4. write everything in between <abstract> and <abstract> including the tags to $new.
5. echo "</doc>" and break to a new line.

，然后继续下一个<doc> </doc>块.

and then move on to the next <doc> </doc> block.

在学习如何完成上述操作方面，我将不胜感激.

I would greatly appreciate all and any help in learning how to do the above.

推荐答案

尝试使用 simplexml库 如下例所示:

Try doing something with the simplexml library like in the following example:

$xml = simplexml_load_file("file.xml"); //load file as SimpleXML object
$newXml = SimpleXMLElement(); // create new SimpleXML object

foreach ($xml->doc as $d){ // change "$xml->doc" to the path to doc in your file
    $doc = $newXml->addChild("doc"); // add <doc></doc>
    $doc->addChild("title", (string)$d->title); //add title child within doc
    $doc->addChild("url", (string)$d->url); //add url child within doc
    $doc->addChild("abstract", (string)$d->abstract); //add abstract child within doc
}
$new = fopen("newFile.xml", "w"); // open new file
fwrite($new, $newXml->asXML()); //write XML to new file using asXML method
fclose($new); // close the new file

希望这会有所帮助.您可以在此处找到simplexml的完整文档: http://php.net/simplexml.examples-basic，而Stackoverflow上还有更多具体的问题和答案: simplexml

Hope this helps. You can find the full documentation of simplexml here: http://php.net/simplexml.examples-basic and there are many more concrete questions and answers here on Stackoverflow: simplexml

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