: Is it (still) advisable to use the PHP extension html tidy? Currently i'm using latest stable version of PHP, webmastering a online shop with Doctype XHTML. Most of our customers use "old"

@Harper822

So, is it still advisable to use html tidy just to get a "cleaner"
source code, or should I provide HTML5-Support. (I would still have to
use tidy for user-input like the description of our products).


It's possible to do both, either by configuring HTML Tidy to process HTML5 (see this question and specifically this answer) or by using another library that supports HTML5 such as HTMLawed.


Moreover, will "older" browsers have problems with HTML5 or will they just ignore it?


Older browsers, notably Firefox 2 and IE6, do have problems with the new HTML5 tags. There are several workarounds, though, the most popular of which is the html5.js script from the HTML5 doctor site. That means there's no good excuse not to use HTML5 today.


And last but not least: will avoiding tidy speed up my page?


Avoiding any kind of additional processing will usually speed up your page. You should cache the static HTML that your tidy script generates so that it's not running on every page load. At it's simplest, this means writing the generated file to disk as an HTML file and serving that instead of the PHP script unless the content has changed. That's beyond the scope of your original question, but this question may prove useful.

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