<?php function format_phone($number) { $num = preg_replace('/[^0-9]/', '', $number); $l = strlen($num); if ($l < 10) { return false; } preg_match('/^([0-9]{3})([0-9]{3})([0-9]{4})([0-9]*)$/', $num, $parts); array_shift($parts); $format = '%1$d-%2$d-%3$d'; if ($l > 10) { $format .= ' x%4$d'; } return sprintf($format, ... $parts); } var_dump(format_phone('8045551234'));
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