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Validate Canadian Postal Code

/ Published in: PHP
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  1. function fnValidatePostal($mValue, $sRegion = '')
  2. {
  3.   $mValue = strtolower($mValue));
  4.   $sFirst = substr($mValue, 0, 1);
  5.   $sRegion = strtolower($sRegion);
  6.  
  7.   $aRegion = array(
  8.     'nl' => 'a',
  9.     'ns' => 'b',
  10.     'pe' => 'c',
  11.     'nb' => 'e',
  12.     'qc' => array('g', 'h', 'j'),
  13.     'on' => array('k', 'l', 'm', 'n', 'p'),
  14.     'mb' => 'r',
  15.     'sk' => 's',
  16.     'ab' => 't',
  17.     'bc' => 'v',
  18.     'nt' => 'x',
  19.     'nu' => 'x',
  20.     'yt' => 'y'
  21.   );
  22.  
  23.   if (preg_match('/[abceghjlkmnprstvxy]/', $sFirst) && !preg_match('/[dfioqu]/', $mValue) && preg_match('/^\w\d\w[- ]?\d\w\d$/', $mValue))
  24.   {
  25.     if (!empty($sRegion) && array_key_exists($sRegion, $aRegion))
  26.     {
  27.       if (is_array($aRegion[$sRegion]) && in_array($sFirst, $aRegion[$sRegion]))
  28.       {
  29.         return true;
  30.       }
  31.       else if (is_string($aRegion[$sRegion]) && $sFirst == $aRegion[$sRegion])
  32.       {
  33.         return true;
  34.       }
  35.     }
  36.     else if (empty($sRegion))
  37.     {
  38.       return true;
  39.     }
  40.   }
  41.  
  42.   return false;
  43. }

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