News Feed
Jobs Feed
Sections




News Archive
Looking for more information on how to do PHP the right way? Check out PHP: The Right Way

Professional PHP Blog:
Two preg_replace Escaping Gotchas
November 14, 2005 @ 06:14:49

From the Professional PHP Blog today there are two "preg_replace gotchas" they wanted to let you know about.

preg_replace is a major workhorse function in PHP. Unfortunately, there are some less than obvious issues with using it properly. Here are two:

  • The e modifier causes the replacement value of preg_replace (including backreferences) to be evaluated as PHP code. This is a powerful capability. If you've ever seen an SQL injection, this sounds dangerous. It would be, too, but PHP automatically escapes any backreferences because building the string to evaluate.
  • Second, most users of the preg_ functions are familiar with preg_quote for escaping strings to use them as literals in regular expression patterns. However, many people don't realize that the replacement parameter of preg_replace also has special characters.

He also gives code examples of each of these situations and shows you what to do to take the safer route around them...

0 comments voice your opinion now!
preg_replace gotchas problem preg_replace gotchas problem


blog comments powered by Disqus

Similar Posts

Derick Rethans' Blog: Namespaces in PHP

Jani Hartikainen's Blog: The problems faced by a common model interface in frameworks

Christopher Kunz's Blog: Warning about the article "SQL Injection" in current "PHP Magazin"

Jacob Santos' Blog: Would PHP benefit from JIT compilation?

Mike Bernat's Blog: The Problem with Wordpress and Drupal


Community Events











Don't see your event here?
Let us know!


series release code language framework component facebook introduction install unittest hack opinion package dependency security podcast application symfony2 hhvm composer

All content copyright, 2014 PHPDeveloper.org :: info@phpdeveloper.org - Powered by the Solar PHP Framework