note 92776 added to function.preg-match

In regard to http://us2.php.net/manual/en/function.preg-match.php#90503 about parsing phone numbers, this algorithm seems to work well. It performs some basic validation tests and can return the phone number as a string or as a normalized string. <?php // RAY_phone_numbers.php - USING USA PHONE NUMBERS error_reporting(E_ALL); function strtophone($phone, $format=FALSE) { // DISCARD NON-NUMERIC CHARACTERS $phone = preg_replace('/[^0-9]/', '', $phone); // DISCARD A LEADING '1' FROM NUMBERS ENTERED LIKE 1-800-555-1212 if (substr($phone,0,1) == '1') $phone = substr($phone,1); // IF LESS THAN TEN DIGITS, IT IS INVALID if (strlen($phone) < 10) return FALSE; // IF IT STARTS WITH '0' OR '1' IT IS INVALID, SECOND DIGIT CANNOT BE '9' if (substr($phone,0,1) == '1') return FALSE; if (substr($phone,0,1) == '0') return FALSE; if (substr($phone,1,1) == '9') return FALSE; // ADD OTHER TESTS HERE AS MAY BE NEEDED // IF NOT FORMATTED if (!$format) return $phone; // ISOLATE THE COMPONENTS OF THE PHONE NUMBER $ac = substr($phone,0,3); $ex = substr($phone,3,3); $nm = substr($phone,6,4); $xt = substr($phone,10); // STANDARDIZE THE PRINTABLE FORMAT OF THE PHONE NUMBER LIKE 212-555-1212-1234 $formatted_phone = $ac . '-' . $ex . '-' . $nm; if ($xt != '') $formatted_phone .= '-' . $xt; return $formatted_phone; } // IF ANYTHING IS POSTED? if (!empty($_POST["phone"])) { // VALIDATE PHONE if (!$phone = strtophone($_POST["phone"], TRUE)) { echo "BOGUS: {$_POST["phone"]} \n"; } else { // SHOW THE FORMATTED PHONE echo "<br/>$phone\n"; } } // END PHP, PUT UP THE FORM TO TEST PHONE NUMBERS ?> <form method="post"> ENTER A PHONE NUMBER: <input name="phone" /><br/> <input type="submit" /> </form> TRY SOME OF THESE (COPY AND PASTE): <br/>1-800-5551212 <br/>202-537-7560 <br/>123456789 <br/>703-356-5300 x2048 <br/>(212) 555-1212 <br/>1 + (212) 555-1212 <br/>1 (292) 226-7000 ---- Server IP: 64.71.164.2 Probable Submitter: 74.9.128.130 ---- Manual Page -- http://www.php.net/manual/en/function.preg-match.php Edit -- https://master.php.net/note/edit/92776 Del: integrated -- https://master.php.net/note/delete/92776/integrated Del: useless -- https://master.php.net/note/delete/92776/useless Del: bad code -- https://master.php.net/note/delete/92776/bad+code Del: spam -- https://master.php.net/note/delete/92776/spam Del: non-english -- https://master.php.net/note/delete/92776/non-english Del: in docs -- https://master.php.net/note/delete/92776/in+docs Del: other reasons-- https://master.php.net/note/delete/92776 Reject -- https://master.php.net/note/reject/92776 Search -- https://master.php.net/manage/user-notes.php