我遇到DOMDocument和空白的问题。目前我有两种类型的XML文件。一年前手动创建了一个文件，我将调用此文件A.第二个文件，即文件B，使用PHP DOMDocument生成。我一直在努力（不成功）在文件A匹配文件B中创建空格。
以下是它的工作原理......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<Items>作为<Slide>元素的子项添加到XML文件中。
当我向文件B添加<Slide>元素时，它就像魅力一样。我甚至可以添加一个没有问题的新<Item>元素。但是，当我尝试访问我刚刚在文件B中使用<Identifier>下面的第二个PHP脚本添加的新$order != 'remove'元素时，我错过了一个节点并选择了<Information/>。
手动创建的文件A似乎具有我生成的文件B中不存在的空格。我已尝试使用preserveWhitespace属性，但它没有帮助。
对于如何解决此问题有任何建议吗？建设性的批评也很受欢迎，因为这是我第一次动态XML操作。我为长度道歉，感谢你的时间!!
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 & Neck</Areas>
<Area>Head & 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。此部分是手动创建的。如果您愿意，可以使用模板。在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 & Neck</Areas>
<Area>Head & Neck</Area>
<Type>Brain Sections</Type>
</root>
文件B - 用户添加新的<Slide>和<Item>后。显示的格式表示DOMDocument创建的格式。 我认为这是错误发生的地方！空白!!!
<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>
PHP脚本用于向XML
添加新的<Slide>元素
<?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($fileLocation)){
echo("File saved successfully!!");
}else echo("There was a problem saving the file!");
用于添加/编辑/删除<Item>和<Identifier>节点的PHP脚本，具体取决于$orders ==警告的值！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!");
?>
答案 0 :(得分：1)
我强烈建议您使用像此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只会让您感到心痛。
更具体地说，我认为你对childNode（）的调用会被空格绊倒，但如果你使用了childElement（）（不确定是否存在，但是使用XPath很容易），它只会忽略任何空白。