Filtering users input is unfortunately something that needs to be done these days. Possibly even more so when the content is coming from another website/service (such as twitter or facebook). Swearing/rude words is quite a serious area, as you really don’t want to offend any visitors to your site by displaying a live thread showing comment or a ‘tweet’ or similar containing offensive langauge (tends to go down badly). So on this very note I set out today to add a live twitter feed to my current project (www.wsaf.co.uk), but decided once I had pulled the data from twitter I should probably remove any swearing before displaying it on the site!
As the site is written in php funnily enough this was also going to be. As I like to make my code as fast a possible I decided I would test the speed to different functions that could be used for this purpose:
preg_replace(); //and... str_ireplace();