function format_uk_phone_number in Phone 5

Convert a valid United Kingdom phone number into standard +44 (0)1970 123 456 #001 international format

Parameters

$phonenumber must be a valid eleven-digit number (with optional extension):

File

./phone.uk.inc, line 69

Code

function format_uk_phone_number($phonenumber) {
  $area = $number = $extension = '';

  //If we already have the formatting we want just return
  if (preg_match("/\n        (\n            \\+44\\s\\(0\\)\\d{4}\\s\\d{3}\\s\\d{3}  # 4 digit area code\n            |\n            \\+44\\s\\(0\\)\\d{3}\\s\\d{3}\\s\\d{4}  # 3 digit area code\n            |\n            \\+44\\s\\(0\\)\\d{2}\\s\\d{4}\\s\\d{4}  # 2 digit area code\n        )\n        (\\s\\#\\d*)?\n    /", $phonenumber)) {
    return $phonenumber;
  }
  else {

    //Simplify to 10 digit number and clean up ready for international reformat.
    $phonenumber = preg_replace("/^(\\+44)?\\s?(\\(?0\\)?)?/", "", $phonenumber);
    $phonenumber = preg_replace("/\\(/", "", $phonenumber);
    $phonenumber = preg_replace("/\\(0/", "", $phonenumber);
    $phonenumber = preg_replace("/\\)/", "", $phonenumber);

    //If there are some spaces in the number assume some level of preformatting
    if (preg_match("/ /", $phonenumber)) {
      $regex = "/\n                # 4 digit area code.\n                (\n                    (\\d{4}) # capture 4 digit area code\n                    \\s+     # ignore required separator to make a distinction with other area codes\n                    (\\d{3}) # capture first set of numbers in the local number\n                    \\s*     # ignore optional separator\n                    (\\d{3}) # capture second set of numbers in the local number\n                |\n                # 3 digit area code.\n                    (\\d{3}) # capture 3 digit area code\n                    \\s+     # ignore required seperator\n                    (\\d{3}) # capture first set of numbers in the local number\n                    \\s*     # ignore possible boundary\n                    (\\d{4}) # capture second set of numbers in the local number\n                |\n                # 2 digit area code.\n                    (\\d{2}) # capture 2 digit area code\n                    \\s+     # ignore required boundary to make a distinction with other area codes\n                    (\\d{4}) # capture first set of numbers in the local number\n                    \\s*     # ignore possible boundary\n                    (\\d{4}) # capture second set of numbers in the local number\n                )\n                # capture the optional extension number\n                (\\s*\\#)?\n                (\\d{4}|\\d{3})?\n            /x";
      preg_match($regex, $phonenumber, $matches);
      var_export($matches);
      $area = $matches[2] . $matches[5] . $matches[8];
      $number = $matches[3] . $matches[6] . $matches[9] . ' ' . $matches[4] . $matches[7] . $matches[10];
      $extension = $matches[12];
    }
    else {
      preg_match("/(\\d{4})(\\d{3})(\\d{3})\\#?(\\d*)?/", $phonenumber, $matches);
      $area = $matches[1];
      $number = $matches[2] . ' ' . $matches[3];
      $extension = $matches[4];
    }
    $phonenumber = '+44 (0)' . $area . ' ' . $number;
    $phonenumber .= empty($extension) ? '' : " #{$extension}";
  }
  return $phonenumber;
}