Highlight text, except html tags

Question

Hey,

I'm using the code below to highlight some keywords in a text:

$message = str_ireplace($words,'<span class="hightlighted_text">'.$words.'</span>',$message);

The text may contain some html tags, for example , etc..

How can I highlight "normal" text, except the text between the html tags? Because when users search for "img" the text will be highlighted and the image doesn't work anymore.

Answer 1

Use a DOM parser of some sort. This is not something you want to do with regex.

Answer 2

Either use a regular expression (hard) instead of the string search replace functions or disallow words that match html tags (and attributes etc.)

Answer 3

Simply go Do these with CSS.. yes...

Answer 4

I agree with Dav. Load $message inside a DOM parser such as simplehtmldom (manual), iterate over the text nodes and make necessary replacements.

I believe the $simplehtmldomobject->find('text'); method will be very helpful.

Answer 5

Thanks for the answers. But how can you return the whole text, included the html text, when replaces are finished?

Answer 6

Now I use Simple HTML Dom parser to parse the text outside the html and replace some words by this code:

    $message= str_get_html($message);

    foreach($message->find('text') as $e) {

    foreach($keywords AS $words) {                              
    $e->outertext = str_ireplace($words,'<span class="highlighted_text">'.$words.'</span>',$e);
}

}

This is working fine, but when I use the following keywords array: array('a','b','c','d','e','f','g','h','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'); I get an php memory error. Is there a way to replace words with the help of the Simple HTML dom parser?

Answer 7

From http://forum.phpfrance.com/vos-contributions/remplacement-selectif-hors-dans-balises-html-t199.html

function mon_rplc_callback($capture){
  global $arg;
  return ($arg['flag'] == 1)
  ? $arg['fct']($arg['from'], $arg['to'], $capture[1]).$capture[2]
  : $capture[1].$arg['fct']($arg['from'], $arg['to'], $capture[2]);
}

function split_tag($from, $to, $txt, $fct, $flag = 1){
  global $arg;
  $arg = compact('from', 'to', 'fct', 'flag');
  return preg_replace_callback('#((?:(?!<[/a-z]).)*)([^>]*>|$)#si', "mon_rplc_callback", $txt);
}

When $flag == 1, the replacement function is applied outside HTML. When $flag == -1, the replacement function is applied inside HTML.

Applied to your example, it would give something like this:

echo split_tag($words, '<span class="hightlighted_text">'.$words.'</span>', $message, 'str_ireplace', 1);

Enjoy! ;)