How do I filter numbers out of a string using PHP?

Question

How do I filter numbers out of a string using PHP?

Answer 1

This is an example of a regular expression being used to replace certain characters.

$str = preg_replace("/[0-9]+/", '', $str);

Answer 2

You can do it with regular expressions, or you can do it with 10 str_replace calls, or you can use this:

function filter_nums($str)

{

for($i = 0; $i<strlen($str); ++$i) if(!ctype_digit($str[$i]) )$out.=$str[$i];

return $out;

}