php: 如何将 HTML 标题 (h2,h3,h4) 转换为嵌套无序列表？

Question

输入数组，其中包含 WordPress 帖子中的 html 标题<?php$headings = array(0 => "<h2>Number One</h2>",1 => "<h2>Number Two</h2>",2 => "<h2>Number Three</h2>",3 => "<h3>Number Four</h3>",4 => "<h2 id='iamanexistingid'>Number Five</h2>",5 => "<h3>Number Six</h4>",6 => "<h4>Number Seven</h2>",7 => "<h2>Number Eight</h2>");现在我想在嵌套无序列表中生成一个结构。输出<ul><li>Number One</li><li>Number Two</li><li>Number Three   <ul>      <li>Number Four</li>   </ul><li>Number Five</li><li>Number Five   <ul>      <li>Number Six         <ul>            <li>Number Seven</li>         </ul>     </li>   </ul></li><li>Number Eight</li></ul>有没有简单的方法可以使用 Simple HTML DOM Parser 生成它？还是诡计？我最初的解决方案对于比一级更深的级别实际上不起作用，并且总体来说不好。我也不知道如何处理 H3 之后的 H4 或 H3 之后的 H3。<?php$headings = array(0 => "<h2>H2 Number One</h2>",1 => "<h2>H2 Number Two</h2>",2 => "<h2>H2 Number Three</h2>",3 => "<h3>H3 Number Four</h3>",4 => "<h2 id='iamanexistingid'>H2 Number Five</h2>",5 => "<h3>H3 Number Six</h4>",6 => "<h4>H4 Number Seven</h2>",7 => "<h3>H3 Number Eight</h2>",8 => "<h2>H2 Number Nine</h2>");$array = array();$lastlevel = 2;foreach ($headings as $key => $value) {  preg_match("/\<(?<name>\w+)(?<attributes>\s+[^>]*|)>/", $value, $matches);  $tagname = $matches[1];  $currentlevel = str_replace("h", "", "$tagname");  if($currentlevel == $lastlevel OR $currentlevel < $lastlevel) {      array_push($array, $value);  } elseif ($currentlevel > $lastlevel) {      array_push($array, [$value]);  }  $lastlevel = $currentlevel;}echo printArrayList($array);function printArrayList($array){    echo "<ul>";    foreach($array as $k => $v) {        if (is_array($v)) {            printArrayList($v);            continue;        }        echo "<li>" . $v . "</li>";    }    echo "</ul>";}

Answer 1

function generateToc($matches) {

    $list ='';

    $current_depth      = 7;

    $numbered_items     = array();

    $numbered_items_min = null;

    array_walk($matches,"removelines");

    // find the minimum heading to establish our baseline

    //for ( $i = 0; $i < count( $matches ); $i ++ ) {

    foreach ( $matches as $i => $match ) {

      if ( $current_depth > $matches[ $i ][2] ) {

        $current_depth = (int) $matches[ $i ][2];

      }

    }

    $numbered_items[ $current_depth ] = 0;

    $numbered_items_min               = 7;

    foreach ( $matches as $i => $match ) {

      $level = $matches[ $i ][2];

      $count = $i + 1;

      if ( $current_depth == (int) $matches[ $i ][2] ) {

        $list .= '<li>';

      }

      // start lists

      if ( $current_depth != (int) $matches[ $i ][2] ) {

        for ( $current_depth; $current_depth < (int) $matches[ $i ][2]; $current_depth++ ) {

          $numbered_items[ $current_depth + 1 ] = 0;

          $list .= '<ul><li>';

        }

      }

      $list .= strip_tags($match);

      // end lists

      if ( $i != count( $matches ) - 1 ) {

        if ( $current_depth > (int) $matches[ $i + 1 ][2] ) {

          for ( $current_depth; $current_depth > (int) $matches[ $i + 1 ][2]; $current_depth-- ) {

            $list .= '</li></ul>';

            $numbered_items[ $current_depth ] = 0;

          }

        }

        if ( $current_depth == (int) @$matches[ $i + 1 ][2] ) {

          $list .= '</li>';

        }

      }

    }

    return '<ul class="toc">' . $list . "</li></ul>";

}

echo generateToc($headings);