wpsmith

<?php

function sanitize_phone( $phone, $international = false ) {
	$format = "/(?:(?:\+?1\s*(?:[.-]\s*)?)?(?:\(\s*([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s*\)|([2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s*(?:[.-]\s*)?)?([2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\s*(?:[.-]\s*)?([0-9]{4})(?:\s*(?:#|x\.?|ext\.?|extension)\s*(\d+))?$/";
	
	$alt_format = '/^(\+\s*)?((0{0,2}1{1,3}[^\d]+)?\(?\s*([2-9][0-9]{2})\s*[^\d]?\s*([2-9][0-9]{2})\s*[^\d]?\s*([\d]{4})){1}(\s*([[:alpha:]#][^\d]*\d.*))?$/';

	// Trim & Clean extension
    $phone = trim( $phone );
    $phone = preg_replace( '/\s+(#|x|ext(ension)?)\.?:?\s*(\d+)/', ' ext \3', $phone );