Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

REGEX: Convert & to & only in double entities

Posted on 2008-10-24
6
Medium Priority
?
975 Views
Last Modified: 2009-01-23
Hello,

For security reasons, and to maintain data I now use htmlentities() to clean user-managed settings before placing the values in form input fields.

The problem is that © becomes ©

I wrote a function to fix this but it changes ALL & to & and I only want to change & to & if it is part of an html entity.

So these should be changed
            <
            ©
            ÷
            À
            "
            ©
            ©
            €

But these should NOT be changed:

            This is a test & only a test.
            dsafdsf&adsfdsf
            &€
            &&

function clean_htmlentities ($str) {
return str_replace(array('&','&'),'&',htmlentities($str));
}

Open in new window

0
Comment
Question by:hankknight
  • 3
  • 2
6 Comments
 
LVL 27

Expert Comment

by:Cornelia Yoder
ID: 22795727
I think you should be using the double_encode in the htmlentities function.  See here for details....

http://us2.php.net/manual/en/function.htmlentities.php
0
 
LVL 27

Expert Comment

by:Cornelia Yoder
ID: 22795743
By the way, double_encode is only available in php 5, so be sure you are up to date in your php version.  :)
0
 
LVL 16

Author Comment

by:hankknight
ID: 22795846
This has to be PHP4 compatible
:-(


0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 27

Expert Comment

by:Cornelia Yoder
ID: 22796052
Go to that manual page for htmlentities, and read through the user posted comments below.  You may find some ideas that will help you, such as

http://us2.php.net/manual/en/function.htmlentities.php#70850

http://us2.php.net/manual/en/function.htmlentities.php#48131

I haven't tried any of these, but maybe you can make one of them work for your needs.
0
 
LVL 51

Accepted Solution

by:
ahoffmann earned 2000 total points
ID: 22804728
the raw regex

(?:&([#x]\d+|[a-zA-Z\d-]+))

then you can prepend the returnd match by &
0
 
LVL 16

Author Comment

by:hankknight
ID: 22825697
How could my function be replaced with this regex?
(?:&([#x]\d+|[a-zA-Z\d-]+))
function clean_htmlentities ($str) {
return str_replace(array('&','&'),'&',htmlentities($str));
}

Open in new window

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Things That Drive Us Nuts Have you noticed the use of the reCaptcha feature at EE and other web sites?  It wants you to read and retype something that looks like this. Insanity!  It's not EE's fault - that's just the way reCaptcha works.  But it i…
Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively.  This article explores the ways PHP can be used to hide and encrypt information.
The viewer will learn how to dynamically set the form action using jQuery.
This tutorial will teach you the core code needed to finalize the addition of a watermark to your image. The viewer will use a small PHP class to learn and create a watermark.
Suggested Courses

578 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question