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UK postcode parser

/ Published in: PHP
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This function can validate and parse UK postcode like SW1A 1AA in to formated array.

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  1. function parseUkPostcode($postcode) {
  2.  
  3. 	$postcode = strtoupper(ereg_replace("[^A-Za-z0-9]", "", trim($postcode)));
  4.  
  5. 	$lenght = strlen($postcode);
  6.  
  7. 	if($lenght < 5 OR $lenght == 4){
  8.  
  9. 		$regex = '/^([A-Z]{1,2})([0-9][0-9A-Z]?)$/';
  10.  
  11. 		if (preg_match($regex, $postcode, $part)) { 
  12.  
  13. 			$code = array(
  14. 		                 'full' 	=> $part[1] . $part[2],
  15. 		                 'area'     => $part[1],
  16. 		                 'district' => $part[2],
  17. 		                 'outer'    => $part[1] . $part[2],
  18. 		                 'sector'   => NULL,
  19. 		                 'walk'     => NULL,
  20. 		                 'inner'    => NULL
  21. 		                 );		 
  22.  
  23. 		}else{
  24.  
  25. 			$code = NULL;
  26.  
  27. 		}
  28.  
  29. 	}else{
  30.  
  31. 		$regex = '/^([A-Z]{1,2})([0-9][0-9A-Z]?)\s*([0-9])([A-Z]{2})$/';
  32.  
  33. 		if (preg_match($regex, $postcode, $part)) { 
  34.  
  35. 			$code = array(
  36. 		                 'full' => $part[1].$part[2].' '.$part[3].$part[4],
  37. 		                 'area'     => $part[1],
  38. 		                 'district' => $part[2],
  39. 		                 'outer'    => $part[1] . $part[2],
  40. 		                 'sector'   => $part[3],
  41. 		                 'walk'     => $part[4],
  42. 		                 'inner'    => $part[3] . $part[4]
  43. 		                 );		 
  44.  
  45. 		}else{
  46.  
  47. 			$code = NULL;
  48.  
  49. 		}
  50. 	}
  51.    return $code;                
  52. }

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