Phone numbers to just numbers

[cmdr_bond]

What function would I use if I want to take a string such as "[phone]" to "3015553263"?

Thanks

[kkobashi]

Why not just iterate through the entire string and use is_numeric()...

function GetPhoneNumber($strPhoneNum)
{
$strDigits = "";
$len = strlen($strPhoneNum);
for ($i=0; $i < $len; ++$i)
{
if (is_numeric($strPhoneNum[$i]))
$strDigits .= $strPhoneNum[$i];
}
return($strDigits);
}

$strDigitsOnly = GetPhoneNumber("[phone]");
echo $strDigitsOnly;