What does this function mean?

[fdjason]

What does this function do and more specifically, what does /[^0-9]/ mean?

 

function CleanNumber($UserInput) {

    $pattern = "/[^0-9]/"; //replace everything except 0-9

    $UserInput = preg_replace($pattern, "", $UserInput);

    return substr($UserInput, 0, 6);

}

 

 

[Ken2k7]

It strips out all non-digit characters and return a string of the first 6 numbers.

 

/[^0-9]/ is a regular expression. It matches all non-digit characters. The 0-9 just means numbers 0 to 9. The ^ is not.