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  1. <?php
  2. $string = '<span class="test">Lorem <i>ipsum</i> <b id="the-b">dolor</b> sit amet!</span>';
  3. print HtmlTruncate::truncate($string, 10) . PHP_EOL;
  4.  
  5. class HtmlTruncate
  6. {
  7.     const READ_STRING = 1;
  8.     const READ_OPEN_TAG = 2;
  9.     const READ_CLOSE_TAG = 3;
  10.  
  11.     public static function truncate($string, $length)
  12.     {
  13.  
  14.         $left = $length;
  15.         $state = self::READ_STRING;
  16.         $trunc = '';
  17.         $tags = 0;
  18.  
  19.         for ($i = 0; $i < strlen($string); $i++) {
  20.             $c = $string[$i];
  21.  
  22.             switch ($state) {
  23.                 case self::READ_STRING:
  24.                     if ($c == '<') {
  25.                         if ($string[$i+1] == '/') {
  26.                             $state = self::READ_CLOSE_TAG;
  27.                         } else {
  28.                             $state = self::READ_OPEN_TAG;
  29.                             $tags += $left ? 0 : 1;
  30.                         }
  31.                         $i--;
  32.                         continue;
  33.                     } else {
  34.                         if ($left) {
  35.                             $trunc .= $c;
  36.                         } else {
  37.                             print "skip: " . $c . PHP_EOL;
  38.                         }
  39.                         $left = max($left-1, 0);
  40.                     }
  41.                     break;
  42.  
  43.                 case self::READ_OPEN_TAG:
  44.                     if ($left) {
  45.                         $trunc .= $c;
  46.                     }
  47.  
  48.                     if ($c == '>') {
  49.                         $state = self::READ_STRING;
  50.                     }
  51.                     break;
  52.  
  53.                 case self::READ_CLOSE_TAG:
  54.                     if ($left || !$tags) {
  55.                         $trunc .= $c;
  56.                     }
  57.  
  58.                     if ($c == '>') {
  59.                         $tags = max($tags-1, 0);
  60.                         $state = self::READ_STRING;
  61.                     }
  62.                     break;
  63.             }
  64.         }
  65.  
  66.         return $trunc;
  67.     }
  68. }
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
skip: m
skip:  
skip: d
skip: o
skip: l
skip: o
skip: r
skip:  
skip: s
skip: i
skip: t
skip:  
skip: a
skip: m
skip: e
skip: t
skip: !
<span class="test">Lorem <i>ipsu</i></span>
https://ideone.com/5Gbe5J
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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