[SOLVED] Only allow Certain Characters

[limitphp]

I only want to allow certain characters in a string.  But, if they have a character that isn't allowed, I want to replace it with nothing.

 

So, instead of using a str_replace() and typing in all the characters that are invalid, I would like to check to see if the characters are valid, and then if they are not, replace them with nothing.

 

Would I do that by using a preg_replace inside of a str_replace?  Or is that the wrong way to go about it?

 

The only characters I want to allow would be [a-zA-Z0-9 ] all letters and numbers and spaces.

 

[rhodesa]

$clean = preg_replace('/[^a-zA-Z0-9 ]/','',$string);

[limitphp]

thank you!