如何在嵌套的 xml 中创建递归函数 - PHP答案

【问题标题】：How do you create a recursive function in a nested xml - PHP如何在嵌套的 xml 中创建递归函数 - PHP
【发布时间】：2012-04-12 12:14:52
【问题描述】：

问候

有人对递归函数有一些经验吗？

我正在尝试将 XML 文件解析为对象（在 PHP 中）（以便稍后在 drupal 中使用它）我正在编写的代码在第一个“子”节点之后几乎总是相同的（见下文）。唯一改变的两件事是来自 xpath 的链接（应该不那么困难）和创建动态对象变量（如果存在）。

第一科的代码（整个就是一门课程）

'$item->ident

$结果 = $xpaths->xpath("/org.olat.course.Structure/rootNode/children/[ident = '$item->ident']/children/[type = 'st' or type = 'sp' or type = 'bc']");

foreach ($resulty as $itemy) {

   $SubjectObject = new subject();

// isnt 100% correct but doesn't matter now

   $SubjectObject->getSubjectFolders($FolderObject);

  $SubjectObject->setSubjectId(isset($item->SubjectId) ? (string) $item->SubjectId: null);
  $SubjectObject->setSubjectShortTitle(isset($item->SubjectName) ? (string) $item->SubjectName: null);

  $ChapterObject->setSubject($SubjectObject);
 }

现在 - 如果我想从课程中的主题中获得主题而不是这将是

$resulty = $xpaths->xpath("/org.olat.course.Structure/rootNode/children/[ident = '$item->ident']/children/[type = 'st' 或 type = 'sp' 或 type = 'bc']");

foreach ($resulty as $itemy) {

   $SubjectObject = new subject();

   $SubjectObject->getSubjectFolders($FolderObject);

  $SubjectObject->setSubjectId(isset($itemy->SubjectId) ? (string) $itemy->SubjectId: null);
  $SubjectObject->setSubjectShortTitle(isset($itemy->SubjectName) ? (string) $itemy->SubjectName: null);

        $resultz = $xpaths->xpath("/org.olat.course.Structure/rootNode/children/*[ident = '$item->ident']children/*[ident = '$itemy->ident']/children/*[type = 'st' or type = 'sp' or type = 'bc']");

            foreach ($resultz as $itemz) {

               $SubSubjectObject = new subject();

               $SubSubjectObject->getSubjectFolders($FolderObject);

              $SubSubjectObject->setSubjectId(isset($itemz->SubjectId) ? (string) $itemz->SubjectId: null);
              $SubSubjectObject->setSubjectShortTitle(isset($itemz->SubjectName) ? (string) $itemz->SubjectName: null);



                            $resulta = $xpaths->xpath("/org.olat.course.Structure/rootNode/children/*[ident = '$item->ident']/children/*[ident = '$itemy->ident']/children/*[ident = '$itemz->ident']/children/*[type = 'st' or type = 'sp' or type = 'bc']");

                                foreach ($resulta as $itema) {

                                   $SubSubSubSubjectObject= new subject();

                                   $SubSubSubSubjectObject->getSubjectFolders($FolderObject);

                                  $SubSubSubSubjectObject->setSubjectId(isset($itema->SubjectId) ? (string) $itema->SubjectId: null);
                                  $SubSubSubSubjectObject->setSubjectShortTitle(isset($itema->SubjectName) ? (string) $itema->SubjectName: null);


                                                  (and so on)


                                  $SubSubSubjectObject->setSubject($SubSubSubSubjectObject);
                                 }



              $SubjectObject->setSubject($SubSubjectObject);

          }


  $ChapterObject->setSubject($SubjectObject);

}

这是 xml 树（示例）

<Structure>

    <rootnode>

        <CursusName>History</CursusName>
        <CursusId>100001</CursusId>
        <children>

            <childNode>

                 <SubjectName>World War 1</SubjectName>
                <SubjectId>100002</SubjectId>
                <children>

                    <childNode>

                         <SubjectName>World War 1.1</SubjectName>
                        <SubjectId>100016</SubjectId>
                        <children>

                            <childNode>

                                 <SubjectName>World War 1.1.1</SubjectName>
                                <SubjectId>100032</SubjectId>
                                <children>

                                    <childNode>

                                         <SubjectName>World War 1.1.1.1</SubjectName>
                                        <SubjectId>100065</SubjectId>
                                        </children>

                                    </childNode>

                                </children>
                                +<children></children>

                            </childNode>

                        </children>
                        +<children></children>

                    </childNode>
                    +<childNode></childNode>

                </children>
                +<children></children>

            </childNode>
            +<childNode></childNode>
            +<childNode></childNode>

        </children>
        +<visibility></visibility>
        +<accessibility></accessibility>

    </rootnode>
    <version>1</version>

</Structure>

所以

有人可以帮我吗？有人知道我可以如何解决对象的问题吗？一种创建对象的 foreach/while 循环？并将它们提取到他的父对象中？

很抱歉这篇长文和所有这些代码行

亲切的问候

迪特

亲切的问候

【问题讨论】：

我认为您需要正确格式化您的代码...

标签： php xml object recursion

【解决方案1】：

function recurseResults($resulty)
{
    foreach ($resulty as $itemy) 
    {
        $SubjectObject = new subject();
        $SubjectObject->getSubjectFolders($FolderObject);
        $SubjectObject->setSubjectId(isset($itemy->SubjectId) ? (string) $itemy->SubjectId: null);
        $SubjectObject->setSubjectShortTitle(isset($itemy->SubjectName) ? (string) $itemy->SubjectName: null);
        $resultz = $xpaths->xpath("/org.olat.course.Structure/rootNode/children/*[ident = '$item->ident']children/*[ident = '$itemy->ident']/children/*[type = 'st' or type = 'sp' or type = 'bc']");
        // __save my new subject somewhere__
        recurseResults($resultz);
    }
}

【讨论】：