PHP XML-如何构建与父子关系处于同一级别的XML节点树
我试图从一个文件中读取xml并像树一样显示它们。我正在使用PHP,希望得到如下所示的输出。xml文件的内容如下所示。。。PHP XML-如何构建与父子关系处于同一级别的XML节点树,php,xml-parsing,Php,Xml Parsing,我试图从一个文件中读取xml并像树一样显示它们。我正在使用PHP,希望得到如下所示的输出。xml文件的内容如下所示。。。 1. 父1 1. 父1 2. 儿童1 1. 父1 3. 儿童2 1. 父1 8. 孙儿1-1 2. 儿童1 12 家长2 12 家长2 15 儿童2-1 12 家长2 我想读这个xml文件(我知道怎么读),但我不能像下面那样格式化它。。。如何获取最顶层父节点的所有节点,并获取这些父节点的子节点(使用递归或其他方法) 父1 儿童1 孙儿1-1 儿童2 家长2
1.
父1
1.
父1
2.
儿童1
1.
父1
3.
儿童2
1.
父1
8.
孙儿1-1
2.
儿童1
12
家长2
12
家长2
15
儿童2-1
12
家长2
我想读这个xml文件(我知道怎么读),但我不能像下面那样格式化它。。。如何获取最顶层父节点的所有节点,并获取这些父节点的子节点(使用递归或其他方法)
- 父1
- 儿童1
- 孙儿1-1
- 儿童2
- 家长2
- 儿童2-1
如果您有任何帮助,我们将不胜感激
编辑*我到目前为止所做的事情
$xml= simplexml_load_string('myxmlstring');
get_categories($xml, 0);
function get_categories($xml, $id) {
if ($id==0)
$Categories = $xml->xpath('Categories/Category[ParentId=Id]');
else
$Categories = $xml->xpath('Categories/Category[ParentId='.$id.' and Id!='.$id.']');
echo '<ul id="catlist'.$id.'">';
foreach($Categories as $Category) {
echo "<li>ID: " . $Category->Id . "--Name: " . $Category->Name;
get_categories($xml, $Category->Id);
echo "</li>";
}
echo "</ul>";
}
$xml=simplexml\u load\u string('myxmlstring');
获取类别($xml,0);
函数get_categories($xml,$id){
如果($id==0)
$Categories=$xml->xpath('Categories/Category[ParentId=Id]');
其他的
$Categories=$xml->xpath('Categories/Categories[ParentId='.$id.'和id!='.$id.]');
echo'”;
foreach($Categories作为$Category){
echo“- ID:.$Category->ID”-Name:.$Category->Name;
获取类别($xml,$Category->Id);
回声“
”;
}
回声“
”;
}
现在我只想确认这是最佳解决方案。或者有人能想出更好的主意……ParentName太过分了,只需输入parentid就足够了 因为您对每个节点进行搜索,所以执行时间将是O(N2),其中N是节点总数 不过,在线性时间中可以选择这样做:首先遍历数据并构建树结构(或某种程度上),然后遍历该结构并根据它输出节点 在这里也是一个不错的选择
// init
$childrenReferences = array();
$rootNodes = array();
$xmlNodes = array();
// gathering structure
$cats = $xml->getElementsByTagName('Category');
for ($i = 0; $i < $cats->length; $i++) {
$cat = $cats[$i];
$id = $children->Id;
$parentId = $cat->ParentId;
$xmlNodes[$id] = $cat;
if ($parentId == $id) {
$rootNodes []= $id;
continue;
}
if (array_key_exists($parentId, $childrenReferences)) {
$childrenReferences[$parentId] []= $id;
} else {
$childrenReferences[$parentId] = array($id);
}
}
// output
function out_nodes($nodes) {
global $childrenReferences, $xmlNodes; // this is not required since php 5.3 or something about
echo "<ul>";
foreach ($nodes as $id) {
$cat = $xmlNodes[$id];
echo "<li>ID: " . $cat->Id . "--Name: " . $cat->Name;
if (array_key_exists($id, $childrenReferences)) { // intermediate node
out_nodes($childrenReferences[$id]);
}
echo "</li>";
}
echo "</ul>";
}
ob_start();
out_nodes($rootNodes);
ob_end_flush();
//初始化
$childrenReferences=array();
$rootNodes=array();
$xmlNodes=array();
//聚集结构
$cats=$xml->getElementsByTagName('Category');
对于($i=0;$i<$cats->length;$i++){
$cat=$cats[$i];
$id=$children->id;
$parentId=$cat->parentId;
$xmlNodes[$id]=$cat;
如果($parentId==$id){
$rootNodes[]=$id;
继续;
}
如果(数组\键\存在($parentId,$childrenReferences)){
$childrenReferences[$parentId][]=$id;
}否则{
$childrenReferences[$parentId]=数组($id);
}
}
//输出
函数输出节点($nodes){
全局$childrenReferences,$xmlNodes;//这不是必需的,因为PHP5.3或关于
回声“”;
foreach($id为节点){
$cat=$xmlNodes[$id];
echo“- ID:.$cat->ID。”--Name:.$cat->Name;
如果(数组\键\存在($id,$childrenReferences)){//中间节点
out_节点($childrenReferences[$id]);
}
回声“
”;
}
回声“
”;
}
ob_start();
out_节点($rootNodes);
ob_end_flush();
代码可能无法工作,甚至无法编译,但您可以理解。谢谢kirilloid。。。。这是很大的帮助。。。我正在使用一些修改的代码。。。xml来自curl,我知道ParentName是多余的,但我无法控制它。这是最后的代码
$childrenReferences = array();
$rootNodesIDs = array();
$xmlNodes = array();
$dom = new DOMDocument;
$dom->loadXML($xml);
$Categories = $dom->getElementsByTagName('Category');
$length = $Categories->length;
for ($i = 0; $i < $length; $i++) {
$cat = $Categories->item($i); //Get the DOMNode
$id = $cat->getElementsByTagName('Id')->item(0)->nodeValue;
$parentId = $cat->getElementsByTagName('ParentId')->item(0)->nodeValue;
$xmlNodes[$id] = $cat;
if ($parentId == $id) {
$rootNodesIDs []= $id;
continue;
}
if (array_key_exists($parentId, $childrenReferences)) {
$childrenReferences[$parentId] []= $id;
} else {
$childrenReferences[$parentId] = array($id);
}
}
function out_nodes($rootids) {
global $childrenReferences, $xmlNodes;
echo "<ul>";
foreach ($rootids as $id) {
$cat = $xmlNodes[$id];
echo "<li>ID: " . $cat->getElementsByTagName('Id')->item(0)->nodeValue . "--Name: " . $cat->getElementsByTagName('Name')->item(0)->nodeValue;
if (array_key_exists($id, $childrenReferences)) { // intermediate node
out_nodes($childrenReferences[$id]);
}
echo "</li>";
}
echo "</ul>";
}
ob_start();
out_nodes($rootNodesIDs);
ob_end_flush();
$childrenReferences=array();
$rootNodesIDs=array();
$xmlNodes=array();
$dom=新的DOMDocument;
$dom->loadXML($xml);
$Categories=$dom->getElementsByTagName('Categories');
$length=$Categories->length;
对于($i=0;$i<$length;$i++){
$cat=$Categories->item($i);//获取DOMNode
$id=$cat->getElementsByTagName('id')->item(0)->nodeValue;
$parentId=$cat->getElementsByTagName('parentId')->item(0)->nodeValue;
$xmlNodes[$id]=$cat;
如果($parentId==$id){
$rootNodesIDs[]=$id;
继续;
}
如果(数组\键\存在($parentId,$childrenReferences)){
$childrenReferences[$parentId][]=$id;
}否则{
$childrenReferences[$parentId]=数组($id);
}
}
函数输出\u节点($rootids){
全局$childrenReferences,$xmlNodes;
回声“”;
foreach($rootids作为$id){
$cat=$xmlNodes[$id];
echo“- ID:.$cat->getElementsByTagName('ID')->项(0)->节点值。”--Name:.$cat->getElementsByTagName('Name')->项(0)->节点值;
如果(数组\键\存在($id,$childrenReferences)){//中间节点
out_节点($childrenReferences[$id]);
}
回声“
”;
}
回声“
”;
}
ob_start();
out_节点($rootNodesIDs);
ob_end_flush();
// init
$childrenReferences = array();
$rootNodes = array();
$xmlNodes = array();
// gathering structure
$cats = $xml->getElementsByTagName('Category');
for ($i = 0; $i < $cats->length; $i++) {
$cat = $cats[$i];
$id = $children->Id;
$parentId = $cat->ParentId;
$xmlNodes[$id] = $cat;
if ($parentId == $id) {
$rootNodes []= $id;
continue;
}
if (array_key_exists($parentId, $childrenReferences)) {
$childrenReferences[$parentId] []= $id;
} else {
$childrenReferences[$parentId] = array($id);
}
}
// output
function out_nodes($nodes) {
global $childrenReferences, $xmlNodes; // this is not required since php 5.3 or something about
echo "<ul>";
foreach ($nodes as $id) {
$cat = $xmlNodes[$id];
echo "<li>ID: " . $cat->Id . "--Name: " . $cat->Name;
if (array_key_exists($id, $childrenReferences)) { // intermediate node
out_nodes($childrenReferences[$id]);
}
echo "</li>";
}
echo "</ul>";
}
ob_start();
out_nodes($rootNodes);
ob_end_flush();
$childrenReferences = array();
$rootNodesIDs = array();
$xmlNodes = array();
$dom = new DOMDocument;
$dom->loadXML($xml);
$Categories = $dom->getElementsByTagName('Category');
$length = $Categories->length;
for ($i = 0; $i < $length; $i++) {
$cat = $Categories->item($i); //Get the DOMNode
$id = $cat->getElementsByTagName('Id')->item(0)->nodeValue;
$parentId = $cat->getElementsByTagName('ParentId')->item(0)->nodeValue;
$xmlNodes[$id] = $cat;
if ($parentId == $id) {
$rootNodesIDs []= $id;
continue;
}
if (array_key_exists($parentId, $childrenReferences)) {
$childrenReferences[$parentId] []= $id;
} else {
$childrenReferences[$parentId] = array($id);
}
}
function out_nodes($rootids) {
global $childrenReferences, $xmlNodes;
echo "<ul>";
foreach ($rootids as $id) {
$cat = $xmlNodes[$id];
echo "<li>ID: " . $cat->getElementsByTagName('Id')->item(0)->nodeValue . "--Name: " . $cat->getElementsByTagName('Name')->item(0)->nodeValue;
if (array_key_exists($id, $childrenReferences)) { // intermediate node
out_nodes($childrenReferences[$id]);
}
echo "</li>";
}
echo "</ul>";
}
ob_start();
out_nodes($rootNodesIDs);
ob_end_flush();