Merge pull request #107 from WebDevStudios/hotfix/wc_sanitize_phone_number

CC-145 Provide fallback if wc_sanitize_phone_number isn't available

Author: richaber

src/View/Admin/WooTab.php

@@ -721,7 +721,11 @@ private function validate_value( $field ) {
 	 * @return string
 	 */
 	public function sanitize_phone_number( $value ) {
-		return wc_sanitize_phone_number( $value );
+		if ( function_exists( 'wc_sanitize_phone_number' ) ) {
+			return wc_sanitize_phone_number( $value );
+		}
+
+		return preg_replace( '/[^\d+]/', '', $value );
 	}
 
 	/**