change title to a URL compliant string

[Floezen]

Hello,

How could I change a page title to a URL compliant string?

For example:
$title = "Gänseleber & Gemüsespieße?"

should become
ganseleber_gemusespiesse

or better

gaenseleber_gemuesespiesse

Replacing known characters seems simple to me, but how assure that only letters, numbers and a underline [a-z0-1_] will be used? Any other and unforeseeable character should be ignored.


Regards
Flözen

[awasson]

I would use the urlencode() function instead of adding a custom replace scheme:
http://www.php.net/urlencode

[crmalibu]

You can use iconv() with the //TRANSLIT option to change as many of the non ascii characters as possible to similar characters in ascii. Then you can use a regular expression to strip any remaining bad characters.

[Floezen]

Thanks allot!
iconv() was what I was looking for.

With

setlocale(LC_ALL, 'de_DE.UTF8');
iconv("ISO-8859-1", "ASCII//TRANSLIT", "$titel"); 

it works for German Umlaute.