XML 和 PHP 空白的诅咒

Question

我遇到了 DOMDocument 和空格的问题。目前我有两种类型的 XML 文件。大约一年前手动创建了一个文件，我将这个文件称为 A。第二个文件，文件 B，是使用 PHP DOMDocument 生成的。我一直在努力（未成功）使文件 A 中的空格与文件 B 匹配。

这是它的工作原理... 用户可以选择将新的<Slide> 元素添加到 XML 文件中。添加新幻灯片后，用户可以选择将新的<Items> 作为<Slide> 元素的子元素添加到XML 文件中。

当我将 <Slide> 元素添加到文件 B 时，它就像一个魅力。我什至可以添加一个零问题的新<Item> 元素。但是，当我尝试访问新的 <Identifier> 元素时，我刚刚使用下面的第二个 PHP 脚本和 $order != 'remove' 添加到文件 B 中，我错过了一个节点，而是选择了 <Information/>。

似乎手动创建的文件 A 有我生成的文件 B 中不存在的空白。我尝试了 preserveWhitespace 属性，但没有帮助。

对我如何解决这个问题有什么建议吗？建设性的批评也很受欢迎，因为这是我对动态 XML 操作的第一次尝试。很抱歉，感谢您的时间！

文件 A - 手动创建 - 我正在尝试匹配此文件！

<?xml version="1.0" encoding="UTF-8"?>
<root>
<Areas>Head &amp; Neck</Areas>
<Area>Head &amp; Neck</Area>
<Type>Angiograph</Type>
<Slide>Ag-01a
    <Title>Catheter Angiography</Title>
    <Item1>
        <Identifier interestCoord=".51,.73" locator="point" labelBool="true" labelTxt="" leaderBool="true">Aortic Arch
        </Identifier>
        <Information/>
        <Question A="" B="" C="" D="" E="" Answer=""/>
    </Item1>

             .... More Items 

文件 B - 在用户添加 <Slide> 之前。这部分是手动创建的。一个模板，如果你愿意的话。用户输入幻灯片名称后，使用下面的代码块生成新幻灯片。

<?xml version="1.0" encoding="UTF-8"?>
<root>
<Areas>Head &amp; Neck</Areas>
<Area>Head &amp; Neck</Area>
<Type>Brain Sections</Type>
</root>

文件 B - 在用户添加新的 <Slide> 和 <Item> 之后。显示的格式表示由 DOMDocument 创建的格式。 我认为这是发生错误的地方！空格！！！

<Slide>Ag-09a
    <Title>Catheter Angiography</Title>
<Item1><Identifier locator="point" interestCoord="0.143,0.65" labelBool="true" labelTxt="" leaderBool="false">Orbit</Identifier><Information/><Question A="" B="" C="" D="" E="" Answer=""/></Item1></Slide>

用于向 XML 添加新的 <Slide> 元素的 PHP 脚本

<?php
session_start();

//Constants
$SECTION_SEP = "========================================================================</br>";

//Variables used to construct file path
$area = trim($_POST['area']);
$slideType = trim($_POST['slideType']);

$rawSlides = trim($_POST['theseSlides']);
$newSlideList = explode(",", $rawSlides);

$fileLocation = "../XML/".$area."/".$slideType."/".$area.".XML";

$dom = new DOMDocument();
echo('New DOMDocument created!</br>');

$dom->load($fileLocation);
echo('XML file loaded!</br>');

/*$dom->preserveWhiteSpace = false;
echo('White space removed!</br>');*/

$dom->documentElement;
echo('DOM initialized!</br>');

if ($dom->getElementsByTagName('Slide')->length == 0){  //New file with no slides

foreach ($newSlideList as $slide){
    $newSlide = $dom->createElement('Slide', $slide);
    $newTitle = $dom->createElement('Title', 'Scan');

    //Add the title element to the Item
    $newSlide->appendChild($newTitle);

    $dom->childNodes->item(0)->appendChild($newSlide);
    echo($slide." has been added to the list!</br>");
 }

} else {
$locators = $dom->getElementsByTagName('Slide');

}

if($dom->save($fileLocation)){
echo("File saved successfully!!");

}else echo("There was a problem saving the file!");

用于添加/编辑/删除 <Item> 和 <Identifier> 节点的 PHP 脚本取决于 $orders 的值 == 警告！冗长：/

<?php
session_start();

//Constants
$SECTION_SEP = "========================================================================</br>";

//Variables used to construct file path
$area = trim($_POST['area']);
$slideType = trim($_POST['slideType']);

$fileLocation = "../XML/".$area."/".$slideType."/".$area.".XML";

//echo("File location:".$fileLocation);

//Current data (c_ for current)
$c_poi = "";
$c_type = "";
$c_lblBool = "";
$c_lblOverride = "";
$c_leaderBool = "";

//Determine if this visit is for new or old data
$orders = trim($_POST['orders']);

//Variables used to replace information in XML file loaded below (n_ for new)
$n_slideName = trim($_POST['slideName']); //slide name in view format ie Ag-01a
$n_identName = trim($_POST['ident']); //contains multiple information separated by comma ie 0,Aortic Arch
$n_type = trim($_POST['type']); //locator type
$n_poi = trim($_POST['poi']);
$n_lblBool = trim($_POST['lblBool']);
$n_lblOverride = trim($_POST['lblOverride']);

echo("Modified: ".date('c')."</br>");
$dom = new DOMDocument();
echo('New DOMDocument created!</br>');

$dom->load($fileLocation);
echo('XML file loaded!</br>');

/*$dom->preserveWhiteSpace = false;
echo('White space removed!</br>');*/

$dom->documentElement;
echo('DOM initialized!</br>');

$locators = $dom->getElementsByTagName('Slide');
echo($locators->length.' elements retrieved</br>');

$slideEntryFound = false;
$identEntryFound = false;
$identAttributesFound = false;
echo($SECTION_SEP);

//Locate the correct slide node
foreach ($locators as $locator){

//If there is a match, store the infomation
// rawSlide[x].childNode[0].nodeValue
if(strcmp(trim($locator->childNodes->item(0)->nodeValue),$n_slideName) == 0){

    $slideEntryFound = true;
    $slideChildren = $locator->childNodes;

    //Locate the correct identifier node
    foreach($slideChildren as $child){

        if( strcmp(trim($child->nodeValue), substr($n_identName,strpos($n_identName,",")+1)) == 0){
            $identEntryFound = true;
            if (strcmp($orders, "remove") == 0){//Removing an element


                echo("The identifier being removed is: ".trim($child->nodeValue."</br>"));
                echo("The node path is: ".($child->childNodes->item(1)->getNodePath())."</br>");
                echo($SECTION_SEP);

                $locator->removeChild($child);
                echo("Identifier successfully removed!</br>");
                echo($SECTION_SEP);
                break;

            } else {//Not removing anything - Adding or Editing

                echo("The identifier being modified is: ".trim($child->nodeValue."</br>"));
                echo("The node path is: ".($child->childNodes->item(1)->getNodePath())."</br>");
                echo($SECTION_SEP);

                if($child->childNodes->item(1)->hasAttributes()){

                    $identAttributesFound = true;

                    $c_poi = $child->childNodes->item(1)->getAttribute('interestCoord');
                     echo("--Current interestCoord: ".$c_poi."</br>");
                     echo("++New interestCoord: ".$n_poi."</br>");
                    if(strcmp($c_poi, $n_poi) != 0){
                       $child->childNodes->item(1)->setAttribute('interestCoord',$n_poi);
                    }

                    $c_type = $child->childNodes->item(1)->getAttribute('locator');
                     echo("--Current locator: ".$c_type."</br>");
                     echo("++New locator: ".$n_type."</br>");

                    $c_lblBool = $child->childNodes->item(1)->getAttribute('labelBool');
                     echo("--Current labelBool: ".$c_lblBool."</br>");
                     //echo("++New labelBool: ".$n_lblBool."</br>");

                    $c_lblOverride = $child->childNodes->item(1)->getAttribute('labelTxt');
                     echo("--Current labelOverride: ".$c_lblOverride."</br>");
                     echo("++New labelOverride: ".$n_lblOverride."</br>");

                    $c_leaderBool = $child->childNodes->item(1)->getAttribute('leaderBool');
                     echo("--Current leaderBool: ".$c_leaderBool."</br>");
                     //echo("++New leaderBool: ".$n_leaderBool."</br>");

                    if($n_lblOverride != ""){
                        echo("**A new label override was detected. The identifier will have the alias ".$n_lblOverride.".");
                    }
               break;
            } else echo("Fatal Error - Node does not contain attributes!</br>");

            if($identEntryFound == true && $identAttributesFound == false)
                echo("Error - Attribute entry not found!");
            break;
            }
        }

    }

    if($slideEntryFound == true && $identEntryFound == false && $orders != "remove"){

        echo("The identifier was not found... creating a new identifier!</br>");

     //Create a new Element

        $newElement = $dom->createElement("Item".((integer)(substr($n_identName,0,strpos($n_identName,",")))+1));

        echo("New element created!!</br>");

        //Create new Item children
        $newSubElem = $dom->createElement("Identifier", substr($n_identName,strpos($n_identName,",")+1));
        $newSubElem->setAttribute('locator',$n_type);
        $newSubElem ->setAttribute('interestCoord',$n_poi);
        $newSubElem->setAttribute('labelBool', $n_lblBool);
        $newSubElem->setAttribute('labelTxt', $n_lblOverride);
        //TODO link this next one to a variable instead of hard coding
        $newSubElem->setAttribute('leaderBool', "false");

        //Info Child
        $newInfoElem = $dom->createElement("Information");
        //Question Child
        $newQuestion = $dom->createElement("Question");
            $newQuestion->setAttribute('A', "");
            $newQuestion->setAttribute('B', "");
            $newQuestion->setAttribute('C', "");
            $newQuestion->setAttribute('D', "");
            $newQuestion->setAttribute('E', "");
            $newQuestion->setAttribute('Answer', "");

        //Add new children to main Item
        $newElement->appendChild($newSubElem);
        $newElement->appendChild($newInfoElem);
        $newElement->appendChild($newQuestion);

        $locator->appendChild($newElement);


        echo("New identifier added!!</br>");

    break;
    }
} else {

}
}
if($slideEntryFound == false)
echo("Error - Slide entry not found!");

if($dom->save($fileLocation)){
echo("File saved successfully!!");

echo('<div id="phpHandleBtns>"></br><form><button type="submit" id="continueEdit" formaction="../edit.php">Continue Editing</button>'.
    '</br><button type="submit" id="doneEdit" formaction="../main.php">Done Editing</button></form></div>');

}else echo("There was a problem saving the file!");

?>

Answer 1

我强烈建议您使用像 http://php.net/manual/en/class.domxpath.php 这样的 XPath API 来查找您感兴趣的节点。尝试直接使用 DOM API 只会让您心痛。

更具体地说，我认为您对 childNode() 的调用被空白所绊倒，但如果您使用 childElement() 代替（不确定是否存在，但使用 XPath 很容易），它只会忽略任何空格。