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close tags in a html-snippet

/ Published in: PHP
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suppose you have some html-formatted text of which you would like to show the first 45 characters.
This function closes any tags that are not-closed because of cutting the first 45 characters.

Note that tags are also counted when defining the first 45 characters!

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  1. <?php
  2.  
  3. function closetags ( $html )
  4. {
  5.     #put all opened tags into an array
  6.     preg_match_all ( "#<([a-z]+)( .*)?(?!/)>#iU", $html, $result );
  7.     $openedtags = $result[1];
  8.  
  9.     #put all closed tags into an array
  10.     preg_match_all ( "#</([a-z]+)>#iU", $html, $result );
  11.     $closedtags = $result[1];
  12.     $len_opened = count ( $openedtags );
  13.     # all tags are closed
  14.     if( count ( $closedtags ) == $len_opened )
  15.     {
  16.         return $html;
  17.     }
  18.     $openedtags = array_reverse ( $openedtags );
  19.     # close tags
  20.     for( $i = 0; $i < $len_opened; $i++ )
  21.     {
  22.         if ( !in_array ( $openedtags[$i], $closedtags ) )
  23.         {
  24.             $html .= "</" . $openedtags[$i] . ">";
  25.         }
  26.         else
  27.         {
  28.             unset ( $closedtags[array_search ( $openedtags[$i], $closedtags)] );
  29.         }
  30.     }
  31.     return $html;
  32. }
  33.  
  34. $str  = "<div>This is some interesting <strong><em>content!</em> And this</strong> line is <em>";
  35. $str .= "abundantly</em> formatted</div>";
  36.  
  37. $snippet = substr ( $str, 0, 45 );
  38.  
  39. $snippet = strrpos ( $snippet, "<" ) > strrpos ( $snippet, ">" ) ? rtrim ( substr ( $str, 0, strrpos ( $snippet, "<" ) ) ) . "....." : rtrim ( $snippet ) . ".....";
  40.  
  41. $x = closetags ( $snippet );
  42.  
  43. print htmlspecialchars ( $x );
  44.  
  45. ?>

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