Function to add dashes to US phone number in PHP
$number = '1234567890';
if(ctype_digit($number) && strlen($number) == 10) {
$number = substr($number, 0, 3) .'-'.
substr($number, 3, 3) .'-'.
substr($number, 6);
}
Or if you for some reason want to avoid substr:
$number = '1234567890';
if(ctype_digit($number) && strlen($number) == 10) {
$parts = str_split($number, 3);
$number = $parts[0] .'-'. $parts[1] .'-'. $parts[3].$parts[4];
}
$number = "1234567890";
$formatted_number = preg_replace("/^(\d{3})(\d{3})(\d{4})$/", "$1-$2-$3", $number);
EDIT: To be a bit more generic and normalize a US phone number given in any of a variety of formats (which should be common practice - there's no reason to force people to type in a phone number in a specific format, since all you're interested in are the digits and you can simply discard the rest):
function localize_us_number($phone) {
$numbers_only = preg_replace("/[^\d]/", "", $phone);
return preg_replace("/^1?(\d{3})(\d{3})(\d{4})$/", "$1-$2-$3", $numbers_only);
}
echo localize_us_number("5551234567"), "\n";
echo localize_us_number("15551234567"), "\n";
echo localize_us_number("+15551234567"), "\n";
echo localize_us_number("(555) 123-4567"), "\n";
echo localize_us_number("+1 (555) 123-4567"), "\n";
echo localize_us_number("Phone: 555 1234567 or something"), "\n";
I feel obliged to post. Cheesiest solution:
$number = "1234567890";
$formatted_number = "$number[0]$number[1]$number[2]-$number[3]$number[4]$number[5]-$number[6]$number[7]$number[8]$number[9]";
But it works and its fast. vs. the preg_replace solution:
250,000 iterations:
preg_replace: 1.23 seconds ugly solution: 0.866 seconds
Pretty meaningless but fun :P
iterate through the string and make counter. When counter is 3 or 7 insert dash.