EoTz.com Web Development Blog

/**
** You are free to use and distribute this function provided this notice stays in tact.
**
** parseLocation returns array containing city and state
**
Sample  Usage
$str = 'dallas tx';
$parsed = parseLocation($str);
print 'Your city is '.$parsed['city'].', '.$parsed['state'];
** Original parseLocation function obtained from EoTz.com.
** Last updated: 05/24/2011
**
**/
function parseLocation($str){
	$state_list = array('AL'=>"Alabama",
	'AK'=>"Alaska",
	'AZ'=>"Arizona",
	'AR'=>"Arkansas",
	'CA'=>"California",
	'CO'=>"Colorado",
	'CT'=>"Connecticut",
	'DE'=>"Delaware",
	'DC'=>"District Of Columbia",
	'FL'=>"Florida",
	'GA'=>"Georgia",
	'HI'=>"Hawaii",
	'ID'=>"Idaho",
	'IL'=>"Illinois",
	'IN'=>"Indiana",
	'IA'=>"Iowa",
	'KS'=>"Kansas",
	'KY'=>"Kentucky",
	'LA'=>"Louisiana",
	'ME'=>"Maine",
	'MD'=>"Maryland",
	'MA'=>"Massachusetts",
	'MI'=>"Michigan",
	'MN'=>"Minnesota",
	'MS'=>"Mississippi",
	'MO'=>"Missouri",
	'MT'=>"Montana",
	'NE'=>"Nebraska",
	'NV'=>"Nevada",
	'NH'=>"New Hampshire",
	'NJ'=>"New Jersey",
	'NM'=>"New Mexico",
	'NY'=>"New York",
	'NC'=>"North Carolina",
	'ND'=>"North Dakota",
	'OH'=>"Ohio",
	'OK'=>"Oklahoma",
	'OR'=>"Oregon",
	'PA'=>"Pennsylvania",
	'RI'=>"Rhode Island",
	'SC'=>"South Carolina",
	'SD'=>"South Dakota",
	'TN'=>"Tennessee",
	'TX'=>"Texas",
	'UT'=>"Utah",
	'VT'=>"Vermont",
	'VA'=>"Virginia",
	'WA'=>"Washington",
	'WV'=>"West Virginia",
	'WI'=>"Wisconsin",
	'WY'=>"Wyoming");
	// lets see if the comma forms a valid state and city
	if(strstr($str,',')){
		$parts = explode(',',$str);
		$state = trim($parts[1],", ");
		$city = trim($parts[0],", ");
	}
	if(!array_key_exists(strtoupper($state),$state_list) && !in_array(ucwords(strtolower($state)),$state_list)){
		$parts = preg_split("/[\s,;]+/",$str);
		$state = array_pop($parts);
		// first see if the last array element is a state abbreviation
		if(strlen($state) == 2 && array_key_exists(strtoupper($state),$state_list)){
			$state = strtoupper($state);
			$city = implode(' ',$parts);
		} else {
			// since it's not an abbreviation let's see if the last element is the full name of a state
			if(in_array(ucwords(strtolower($state)),$state_list)){
				$state = ucwords(strtolower($state));
				$city = implode(' ',$parts);
				//check if this could be the wrong state (i.e. virginia could be west virginia)
				if(in_array(ucwords(strtolower($parts[count($parts)-1] . ' ' . $state)),$state_list)){
					$state = ucwords(strtolower(array_pop($parts) . ' ' . $state));
					$city = implode(' ',$parts);
				}
			} else {
				// we need at least 2 words left to continue
				if(count($parts) < 2) return false;
				$state = array_pop($parts) . ' ' . $state;
				if(in_array(ucwords(strtolower($state)),$state_list)){
					$state = ucwords(strtolower($state));
					$city = implode(' ',$parts);
				} else {
					// we need at least 2 words left to continue
					if(count($parts) < 2) return false;
					// check if the 3rd word from the end forms a valid state name
					$state = array_pop($parts) . ' ' . $state;
					if(in_array(ucwords(strtolower($state)),$state_list)){
						$state = ucwords(strtolower($state));
						$city = implode(' ',$parts);
					} else {
						return false;
					}
				}
			}
			$state = array_search($state,$state_list);
		}
	}
// Here we can query the result against a database to make sure it's valid. Ignore this section if you don't want to check against a database.
/*$sql = 'SELECT `city`,`state` FROM `city_state` WHERE `city`="'.$city.'" and `state`="'.$state.'"';
$result = mysql_query($sql);
if(mysql_num_rows($result) > 0){
return array('city'=>mysql_result($result,0,'city'),'state'=>mysql_result($result,0,'state'));
} else {
return false;
}*/
return array('city'=>$city,'state'=>$state);
}