Jump to content

Recommended Posts

Should be a simple one, I need to know not just how to remove script tags, but also all of the text between them, ie i need a script that, upon encountering <script>, removes everything until it encounters </script>.

At the moment i can remove the script tags which obviously takes care of the security aspect, but it leaves the content of the tags in my DB which obvisuly I dont want for neatness reasons.

Cheers!
Link to comment
https://forums.phpfreaks.com/topic/4079-remove-tags-and-everything-in-them/
Share on other sites

Ok, sorted i'll post the solution for anyone that needs it:
I found this on php.net but it wasnt working and also used PHP5 only functions so I modified it and it's now working with PHP4

[code]
// Usage:
//    $nasty_tags=array('script','body');  #etc
//    $to_clean='Here is some script: <script>alert("oops")</script> - it will be cleaned!';
//    $clean_str = removeTags($to_clean,$nasty_tags);
function removeTags($text,$tags_array)
{
       $length = strlen($text);
       $pos =0;
       $tags_array = array_flip($tags_array);
       while ($pos < $length && ($pos = strpos($text,'<',$pos)) !== false){
           $dlm_pos = strpos($text,' ',$pos);
           $dlm2_pos = strpos($text,'>',$pos);
           if ($dlm_pos > $dlm2_pos)$dlm_pos=$dlm2_pos;
           $which_tag = strtolower(substr($text,$pos+1,$dlm_pos-($pos+1)));
           $tag_length = strlen($srch_tag);
           if (!isset($tags_array[$which_tag])){
               //if no tag matches found
               ++$pos;
               continue;
           }
           //find the end
           $sec_tag = '</'.$which_tag.'>';
           $sec_pos = strpos($text,$sec_tag,$pos+$tag_length);
           //remove everything after if end of the tag not found
           if ($sec_pos === false) $sec_pos = $length-strlen($sec_tag);
           $rmv_length = $sec_pos-$pos+strlen($sec_tag);
           $text = substr_replace($text,'',$pos,$rmv_length);
           //update length
           $length = $length - $rmv_length;
           $pos++;
       }
       return $text;
}
[/code]
OK for some reason that script above would only work it if the script tags were not the first or last item in a string. This (much neater) solution works much better:

[code]function evilTags($text)
{
    // Part 1
    // This array is for single tags and their closing counterparts
    
    $tags_to_strip = Array("html","body","meta","link","head");
    
    foreach ($tags_to_strip as $tag)
    {
           $text = preg_replace("/<\/?" . $tag . "(.|\s)*?>/","",$text);
    }
    
    // Part 2
    // This array is for stripping opening and closing tags AND what's in between
    
    $tags_and_content_to_strip = Array("title","script");
    
    foreach ($tags_and_content_to_strip as $tag) {
           $text = preg_replace("/<" . $tag . ">(.|\s)*?<\/" . $tag . ">/","",$text);
    }
    
    return $text;
}[/code]
This thread is more than a year old. Please don't revive it unless you have something important to add.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.