Skip to main content

PHP Function to remove the HTML tags along with their contents - PHP function to remove HTML tags only

Usually strip_tags() function is used for removing tags from an html string. but there are some issues with this function

1. It does not validate the HTML, partial or broken tags can result in the removal of more text/data than expected.
2. It does not modify any attributes on the tags that you provide as allowable_tags parameter.
3. It may give different outputs for different versions of the same tag. For example for <br> and <br />
4. For a badly formated HTML string like " PHP guys <b<b>> rocks </b<b>> ", it may give unexpected results.

Here are some work arounds:

PHP function to remove the HTML tags along with their contents:

function strip_tags_content($text, $tags = '', $invert = FALSE) {
$op_string = "";

preg_match_all('/<(.+?)[\s]*\/?[\s]*>/si', trim($tags), $tags);
$tags = array_unique($tags[1]);

if(is_array($tags) AND count($tags) > 0) {
if($invert == FALSE) {
$op_string = preg_replace('@<(?!(?:'. implode('|', $tags) .')\b)(\w+)\b.*?>.*?</\1>@si', '', $text);
else {
$op_string = preg_replace('@<('. implode('|', $tags) .')\b.*?>.*?</\1>@si', '', $text);
elseif($invert == FALSE) {
$op_string = preg_replace('@<(\w+)\b.*?>.*?</\1>@si', '', $text);

// ----- remove multiple spaces -----
$op_string = trim(preg_replace('/ {2,}/', ' ', $op_string));

return $op_string;

PHP function to remove the HTML tags and the line control characters

function remove_all_tags($string) {

// ----- remove HTML TAGs -----
$string = preg_replace ('/<[^>]*>/', ' ', $string);

// ----- remove control characters -----
$string = str_replace("\r", '', $string); // --- replace with empty space
$string = str_replace("\n", ' ', $string); // --- replace with space
$string = str_replace("\t", ' ', $string); // --- replace with space

// ----- remove multiple spaces -----
$string = trim(preg_replace('/ {2,}/', ' ', $string));

return $string;



Input Text
$text = '<b>PHP</b> <b<b>>guys</b<b>> are <div>rocking</div>';

Result for strip_tags($text) :
PHP <b>guys</b> are rocking

Result for strip_tags_content($text) :
PHP are

Result for strip_tags_content($text, '<div>'):
PHP are <div>rocking</div>

Result for strip_tags_content($text, '<b>', TRUE);
text with <div>tags</div>

Result for remove_all_tags($text):
PHP guys are rocking

Use of this Strip functions
1. Can be used for validating User inputs for html elements
2. Can be used to check the GET parameters to find the presence of html elements like script tags which hackers use to include unauthorised JS scripts into a web page ( *Cross-Site Scripting vulnerabilities [ XSS ] ) .

Sample Vulnerable URL for the above mentioned scenario:<Script>alert(\"You are hacked\")</Script>
If this Get parameters are not validated and user is printing the $_GET['place'] variable. The when the page is loaded it will alert the message "You are hacked".

For more details visit

*Cross-Site Scripting [ XSS ] Attack
A target system is identified with XSS which occurs when dynamically generated web pages display user input, such as login information, that is not properly validated, allowing an attacker to embed malicious scripts into the generated page which is then executed by the browser on the machine of any user that views the page with the malicious content.
If successful, Cross-Site Scripting vulnerabilities can be exploited to manipulate or steal cookies, create requests which appear to come from a valid user, compromise confidential information, or execute malicious code on end user systems.

XSS attack can also be prevented using the .htaccess file. Click here for more details. Here it checks for the presence of script or iframe tags in the url or the query string and if found , hacker will be redirected to a custom error page.

Popular posts from this blog

Payback Points - How to redeem - How to merge multiple payback accounts - Block Payback card - Payback customer care

How to apply for a new ration card and what are the documents required?

List of documents required for new ration card application in Kerala and how to apply

Application for a new ration card should be addressed to Taluk Supply Officer (TSO) / City Rationing Officer (CRO) of applicant's residing area.

Primary document required are Residence certificate, Income certificate and incase the applicant's name is in another ration card then he/she should submit the reduction certificate ontained from previous TSO / CRO as proof for removing his/her name from old Ration card.

You can get the new application from your currently residing Taluk Supply Office.

Joomla and Forum Integration - Integrating Forums to Joomla

Joomla is one of the most popular CMS opensource packages. It is very easier to develop website's using Joomla. You just need to download Joomla package from Joomla's Official website  and install it on your domain and later adding customizations to templates and feature and Your website is ready :). Now a days most websites provides a forum section for it users for discussing various article topics, gathering opinions etc.

Following are some best know forum opensource packages which can be integrated with Joomla and create a new forum experience for users

Urgent Openings for PHP trainees, Andriod / IOS developers and PHP developers in Kochi Trivandrum Calicut and Bangalore. Please Send Your updated resumes to   Read more »
Search This Blog