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  1. <?php
  2.  
  3.     class HTMLUtils {
  4.  
  5.         public static function closeUnclosedTags($html) {
  6.  
  7.             $aloneTags = array('area', 'base', 'basefont', 'bgsound', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'isindex', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr');
  8.             $endNameTagSymbols = array('>', ' ', "\n", "\r", "\t");
  9.             $openedTagsStack = array();
  10.             $currentTag = '';
  11.             $insideOpenTag = false;
  12.             $insideCloseTag = false;
  13.             $waitForTagEnd = false;
  14.             $closedBrake = false;
  15.  
  16.             $html = preg_replace('%<!-[^>]*->%', '', $html);
  17.  
  18.             for ($i = 0; $i < strlen($html); $i++) {
  19.  
  20.                 if ($html[$i] == '<') {
  21.  
  22.                     if (!$insideOpenTag && !$insideCloseTag) {
  23.  
  24.                         if ($html[$i + 1] == '/') {
  25.                             $insideCloseTag = true;
  26.                             $i++;
  27.                         } else {
  28.                             $insideOpenTag = true;
  29.                         }
  30.  
  31.                     }
  32.  
  33.                 } elseif ($waitForTagEnd) {
  34.  
  35.                     if ($html[$i] == '>') {
  36.  
  37.                         $insideOpenTag = false;
  38.                         $insideCloseTag = false;
  39.                         $waitForTagEnd = false;
  40.  
  41.                     } else continue;
  42.  
  43.                 } elseif ($insideOpenTag || $insideCloseTag) {
  44.  
  45.                     if (!in_array($html[$i], $endNameTagSymbols)) {
  46.  
  47.                         $currentTag .= $html[$i];
  48.  
  49.                     } else {
  50.  
  51.                         if ($html[$i] == '>') {
  52.  
  53.                             $closedBrake = true;
  54.  
  55.                         }
  56.  
  57.                         if ($insideOpenTag) {
  58.  
  59.                             if (!in_array($currentTag, $aloneTags))
  60.                                 $openedTagsStack[] = $currentTag;
  61.  
  62.                         } else {
  63.  
  64.                             if (!in_array($currentTag, $openedTagsStack)) {
  65.  
  66.                                 $html = substr($html, 0, $i - strlen($currentTag) - 2) . substr($html, strpos($html, '>', $i) + 1);
  67.                                 $i -= strlen($currentTag) + 3;
  68.  
  69.                                 $closedBrake = true; // костыль
  70.  
  71.                             } else {
  72.  
  73.                                 $lastOpenedTag = array_pop($openedTagsStack);
  74.                                 $needToInsert = '';
  75.  
  76.                                 while ($lastOpenedTag != $currentTag) {
  77.  
  78.                                     $needToInsert .= '</' . $lastOpenedTag . '>';
  79.                                     $lastOpenedTag = array_pop($openedTagsStack);
  80.  
  81.                                 }
  82.  
  83.                                 $html = substr($html, 0, $i - strlen($currentTag) - 2) . $needToInsert . substr($html, $i - strlen($currentTag) - 2);
  84.  
  85.                                 $i += strlen($needToInsert);
  86.  
  87.                             }
  88.  
  89.                         }
  90.  
  91.                         $currentTag = '';
  92.  
  93.                         if ($closedBrake) {
  94.  
  95.                             $insideOpenTag = false;
  96.                             $insideCloseTag = false;
  97.                             $closedBrake = false;
  98.  
  99.                         } else {
  100.  
  101.                             $waitForTagEnd = true;
  102.  
  103.                         }
  104.  
  105.                     }
  106.  
  107.  
  108.  
  109.                 } elseif (!$insideOpenTag && !$insideCloseTag && $html[$i] == '>') {
  110.  
  111.                     $html = substr($html, 0, $i) . '&gt;' . substr($html, $i + 1);
  112.                     $i += 3;
  113.  
  114.                 }
  115.  
  116.             }
  117.  
  118.             if ($insideOpenTag || $insideCloseTag)
  119.                 $html = substr($html, 0, strrpos($html, '<'));
  120.  
  121.             if (!empty($openedTagsStack)) {
  122.  
  123.                 for ($i = count($openedTagsStack) - 1; $i >= 0; $i--)
  124.                     $html .= '</' . $openedTagsStack[$i] . '>';
  125.  
  126.             }
  127.  
  128.             return $html;
  129.  
  130.         }
  131.         // логика - закрывает все теги, закрытые без открытых удаляет
  132.  
  133.     }
  134.  
  135.     $html = '<b class="baka"><!-- --><b top="kek"><i hui><img lal><stro>ng><i>k</b></strong )))></i></stro';
  136.  
  137.     echo $html . "\n";
  138.  
  139.     echo HTMLUtils::closeUnclosedTags($html);
Success #stdin #stdout 0.02s 52432KB
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stdin
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Standard input is empty
stdout
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<b class="baka"><!-- --><b top="kek"><i hui><img lal><stro>ng><i>k</b></strong )))></i></stro
<b class="baka"><b top="kek"><i hui><img lal><stro>ng&gt;<i>k</i></stro></i></b></b>
https://ideone.com/AZIVW9
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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