Tronquage de chaine (HTML)

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Contenu du snippet

Très utile, ce petit code permet d'afficher les premiers caractères d'une chaîne, suivis de points de suspension au besoin.
Les chaine sera coupée proprement (pas au milieu d'un tag HTML, ...)

N'hésitez pas à faire vos retours ou à améliorer ce code, il est là pour ça ! 

 
  /** 
   * Truncates text. 
   * Cuts a string to the length of $length and replaces the last characters 
   * with the ending if the text is longer than length.
   * 
   * @param string  $text String to truncate. 
   * @param integer $length Length of returned string, including ellipsis. 
   * @param string  $ending Ending to be appended to the trimmed string. 
   * @param boolean $exact If false, $text will not be cut mid-word 
   * @param boolean $considerHtml If true, HTML tags would be handled correctly 
   * @return string Trimmed string. 
   */
  function tronquerHTML($text, $length = 100, $ending = '...', $exact = true, $considerHtml = true) { 
   if ($considerHtml) { 
    // if the plain text is shorter than the maximum length, return the whole text 
    if (strlen(preg_replace('/<.*?>/', '', $text)) <= $length) { 
     return $text; 
    } 

    // splits all html-tags to scanable lines 
    preg_match_all('/(<.+?>)?([^<>]*)/s', $text, $lines, PREG_SET_ORDER); 

    $total_length = strlen($ending); 
    $open_tags = array (); 
    $truncate = ''; 

    foreach ($lines as $line_matchings) { 
     // if there is any html-tag in this line, handle it and add it (uncounted) to the output 
     if (!empty ($line_matchings[1])) { 
      // if it's an "empty element" with or without xhtml-conform closing slash (f.e. <br/>) 
      if (preg_match('/^<(s*.+?/s*|s*(img|br|input|hr|area|base|basefont|col|frame|isindex|link|meta|param)(s.+?)?)>$/is', $line_matchings[1])) { 
       // do nothing 
       // if tag is a closing tag (f.e. </b>) 
      } else 
      if (preg_match('/^<s*/([^s]+?)s*>$/s', $line_matchings[1], $tag_matchings)) { 
       // delete tag from $open_tags list 
       $pos = array_search($tag_matchings[1], $open_tags); 
       if ($pos !== false) { 
        unset ($open_tags[$pos]); 
       } 
       // if tag is an opening tag (f.e. <b>) 
      } else 
      if (preg_match('/^<s*([^s>!]+).*?>$/s', $line_matchings[1], $tag_matchings)) { 
       // add tag to the beginning of $open_tags list 
       array_unshift($open_tags, strtolower($tag_matchings[1])); 
      } 
      // add html-tag to $truncate'd text 
      $truncate .= $line_matchings[1]; 
     } 

     // calculate the length of the plain text part of the line; handle entities as one character 
     $content_length = strlen(preg_replace('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', ' ', $line_matchings[2])); 
     if ($total_length + $content_length > $length) { 
      // the number of characters which are left 
      $left = $length - $total_length; 
      $entities_length = 0; 
      // search for html entities 
      if (preg_match_all('/&[0-9a-z]{2,8};|&#[0-9]{1,7};|&#x[0-9a-f]{1,6};/i', $line_matchings[2], $entities, PREG_OFFSET_CAPTURE)) { 
       // calculate the real length of all entities in the legal range 
       foreach ($entities[0] as $entity) { 
        if ($entity[1] + 1 - $entities_length <= $left) { 
         $left--; 
         $entities_length += strlen($entity[0]); 
        } else { 
         // no more characters left 
         break; 
        } 
       } 
      } 
      $truncate .= substr($line_matchings[2], 0, $left + $entities_length); 
      // maximum lenght is reached, so get off the loop 
      break; 
     } else { 
      $truncate .= $line_matchings[2]; 
      $total_length += $content_length; 
     } 

     // if the maximum length is reached, get off the loop 
     if ($total_length >= $length) { 
      break; 
     } 
    } 
   } else { 
    if (strlen($text) <= $length) { 
     return $text; 
    } else { 
     $truncate = substr($text, 0, $length -strlen($ending)); 
    } 
   } 

   // if the words shouldn't be cut in the middle... 
   if (!$exact) { 
    // ...search the last occurance of a space... 
    $spacepos = strrpos($truncate, ' '); 
    if (isset ($spacepos)) { 
     // ...and cut the text in this position 
     $truncate = substr($truncate, 0, $spacepos); 
    } 
   } 

   // add the defined ending to the text 
   $truncate .= $ending; 

   if ($considerHtml) { 
    // close all unclosed html-tags 
    foreach ($open_tags as $tag) { 
     $truncate .= '</' . $tag . '>'; 
    } 
   } 

   return $truncate; 

  }

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