/* Convert State Name/Abbrev/Code Function */
function convertState($strInput, $strFormat='name', $blnDefaultToInput=false) {
	$arrStates = array(
		array('code'=>'01', 'abbrev'=>'AL', 'name'=>'Alabama'),
		array('code'=>'02', 'abbrev'=>'AK', 'name'=>'Alaska'),
		array('code'=>'04', 'abbrev'=>'AZ', 'name'=>'Arizona'),
		array('code'=>'05', 'abbrev'=>'AR', 'name'=>'Arkansas'),
		array('code'=>'06', 'abbrev'=>'CA', 'name'=>'California'),
		array('code'=>'08', 'abbrev'=>'CO', 'name'=>'Colorado'),
		array('code'=>'09', 'abbrev'=>'CT', 'name'=>'Connecticut'),
		array('code'=>'10', 'abbrev'=>'DE', 'name'=>'Delaware'),
		array('code'=>'11', 'abbrev'=>'DC', 'name'=>'District of Columbia'),
		array('code'=>'11', 'abbrev'=>'DC', 'name'=>'Washington DC'),
		array('code'=>'11', 'abbrev'=>'DC', 'name'=>'Washington D.C.'),
		array('code'=>'12', 'abbrev'=>'FL', 'name'=>'Florida'),
		array('code'=>'13', 'abbrev'=>'GA', 'name'=>'Georgia'),
		array('code'=>'15', 'abbrev'=>'HI', 'name'=>'Hawaii'),
		array('code'=>'16', 'abbrev'=>'ID', 'name'=>'Idaho'),
		array('code'=>'17', 'abbrev'=>'IL', 'name'=>'Illinois'),
		array('code'=>'18', 'abbrev'=>'IN', 'name'=>'Indiana'),
		array('code'=>'19', 'abbrev'=>'IA', 'name'=>'Iowa'),
		array('code'=>'20', 'abbrev'=>'KS', 'name'=>'Kansas'),
		array('code'=>'21', 'abbrev'=>'KY', 'name'=>'Kentucky'),
		array('code'=>'22', 'abbrev'=>'LA', 'name'=>'Louisiana'),
		array('code'=>'23', 'abbrev'=>'ME', 'name'=>'Maine'),
		array('code'=>'24', 'abbrev'=>'MD', 'name'=>'Maryland'),
		array('code'=>'25', 'abbrev'=>'MA', 'name'=>'Massachusetts'),
		array('code'=>'26', 'abbrev'=>'MI', 'name'=>'Michigan'),
		array('code'=>'27', 'abbrev'=>'MN', 'name'=>'Minnesota'),
		array('code'=>'28', 'abbrev'=>'MS', 'name'=>'Mississippi'),
		array('code'=>'29', 'abbrev'=>'MO', 'name'=>'Missouri'),
		array('code'=>'30', 'abbrev'=>'MT', 'name'=>'Montana'),
		array('code'=>'31', 'abbrev'=>'NE', 'name'=>'Nebraska'),
		array('code'=>'32', 'abbrev'=>'NV', 'name'=>'Nevada'),
		array('code'=>'33', 'abbrev'=>'NH', 'name'=>'New Hampshire'),
		array('code'=>'34', 'abbrev'=>'NJ', 'name'=>'New Jersey'),
		array('code'=>'35', 'abbrev'=>'NM', 'name'=>'New Mexico'),
		array('code'=>'36', 'abbrev'=>'NY', 'name'=>'New York'),
		array('code'=>'37', 'abbrev'=>'NC', 'name'=>'North Carolina'),
		array('code'=>'38', 'abbrev'=>'ND', 'name'=>'North Dakota'),
		array('code'=>'39', 'abbrev'=>'OH', 'name'=>'Ohio'),
		array('code'=>'40', 'abbrev'=>'OK', 'name'=>'Oklahoma'),
		array('code'=>'41', 'abbrev'=>'OR', 'name'=>'Oregon'),
		array('code'=>'42', 'abbrev'=>'PA', 'name'=>'Pennsylvania'),
		array('code'=>'44', 'abbrev'=>'RI', 'name'=>'Rhode Island'),
		array('code'=>'45', 'abbrev'=>'SC', 'name'=>'South Carolina'),
		array('code'=>'46', 'abbrev'=>'SD', 'name'=>'South Dakota'),
		array('code'=>'47', 'abbrev'=>'TN', 'name'=>'Tennessee'),
		array('code'=>'48', 'abbrev'=>'TX', 'name'=>'Texas'),
		array('code'=>'49', 'abbrev'=>'UT', 'name'=>'Utah'),
		array('code'=>'50', 'abbrev'=>'VT', 'name'=>'Vermont'),
		array('code'=>'51', 'abbrev'=>'VA', 'name'=>'Virginia'),
		array('code'=>'53', 'abbrev'=>'WA', 'name'=>'Washington'),
		array('code'=>'54', 'abbrev'=>'WV', 'name'=>'West Virginia'),
		array('code'=>'55', 'abbrev'=>'WI', 'name'=>'Wisconsin'),
		array('code'=>'56', 'abbrev'=>'WY', 'name'=>'Wyoming'),
		array('code'=>'60', 'abbrev'=>'AS', 'name'=>'American Samoa'),
		array('code'=>'66', 'abbrev'=>'GU', 'name'=>'Guam'),
		array('code'=>'69', 'abbrev'=>'MP', 'name'=>'Northern Mariana Islands'),
		array('code'=>'72', 'abbrev'=>'PR', 'name'=>'Puerto Rico'),
		array('code'=>'78', 'abbrev'=>'VI', 'name'=>'Virgin Islands'),
		array('code'=>'64', 'abbrev'=>'FM', 'name'=>'Federated States of Micronesia'),
		array('code'=>'68', 'abbrev'=>'MH', 'name'=>'Marshall Islands'),
		array('code'=>'70', 'abbrev'=>'PW', 'name'=>'Palau')
	);

	$strOutput = ($blnDefaultToInput) ? $strInput : '';
	$strFormat = strtolower(trim($strFormat));

	foreach ($arrStates as $arrState) {
		foreach ($arrState as $strValue) {
			if (strtolower($strValue) == strtolower(trim($strInput))) {
				if ($strFormat == 'code') {
					$strOutput = $arrState['code'];
				}
				else if ($strFormat == 'abbrev') {
					$strOutput = $arrState['abbrev'];
				}
				else {
					$strOutput = $arrState['name'];
				}
				break;
			}
		}
	}

	return $strOutput;
}

http://concept211.com

State to Name/Abbreviation/Code Conversion Function

State to Name/Abbreviation/Code Conversion Function

PHP