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<?php
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/**
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 * Bar codes checker - Checks if a barcode is valid and returns barcode type
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 *
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 * @link		http://www.phpclasses.org/package/8560-PHP-Detect-type-and-check-EAN-and-UPC-barcodes.html
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 * @author		Ferry Bouwhuis
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 * @version		1.0.1
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 * @LastChange	2014-04-13
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 */
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class clsLibGTIN
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{
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	public static function GTINCheck($p_sGTINCode, $p_bReturnGTIN14 = FALSE, $p_getType = 0)
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	{
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		//Setting return value
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		/*
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		 * If TRUE it will retun al barcodes as 14 digit strings
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		 * If FALSE it will return only what is needed UPC -> 12 / EAN -> 13 /
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		 */
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		$bReturnGTIN14 = $p_bReturnGTIN14;
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		//Filter UPC coupon codes
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		/*
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		 * If TRUE it will return false on UPC coupon codes
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		 * Type will always return UPC coupon code
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		 */
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		$bSkipCouponCodes = true;
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		//Trims parsed string to remove unwanted whitespace or characters
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		$p_sGTINCode = (string)trim($p_sGTINCode);
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		if(preg_match('/[^0-9]/', $p_sGTINCode))
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			return false;
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		if(!is_string($p_sGTINCode)){
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			$p_sGTINCode = strval($p_sGTINCode);
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		}
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		$sGTINCode = trim($p_sGTINCode);
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		$p_sGTINCode = null;
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		$length = strlen($sGTINCode);
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		if(($length > 11 && $length <= 14) || $length == 8){
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			$zerros = 18-$length;
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			$length = null;
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			$fill = "";
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			for($i = 0; $i < $zerros; $i++){
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				$fill .= "0";
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			}
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			$zerros = null;
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			$i = null;
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			$sGTINCode = $fill . $sGTINCode;
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			$fill = null;
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			if(!clsLibGTIN::GTINCheckDigit($sGTINCode))
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	     	{
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				return FALSE;
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			}elseif(substr($sGTINCode,5,1) > 2){
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				//EAN / JAN / EAN-13 code
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				if($p_getType){
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				    if (in_array(substr($sGTINCode,5,3), array("978", "979"))){
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					    return 'ISBN';
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				    }else{
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					    return 'EAN';
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				    }
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				}else{
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					return (string)substr($sGTINCode,($bReturnGTIN14 ? -14 : -13));
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				}
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			}elseif(substr($sGTINCode,6,1) == 0 && substr($sGTINCode,0,10) == 0){
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				//EAN-8 / GTIN-8 code
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				if($p_getType){
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					return 'EAN-8';
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				}else{
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					return (string)substr($sGTINCode,($bReturnGTIN14 ? -14 : -8));
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				}
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			}elseif(substr($sGTINCode,5,1) <= 0){
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				//UPC / UCC-12 GTIN-12 code
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				if($p_getType){
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				    if(substr($sGTINCode,6,1) == 5)
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				        return 'UPC coupon code';
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				    else
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    					return 'UPC';
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				}else{
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				    if($bSkipCouponCodes && substr($sGTINCode,6,1) == 5)
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				        return false;
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					return (string)substr($sGTINCode,($bReturnGTIN14 ? -14 : -12));
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				}
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			}elseif(substr($sGTINCode,0,6) == 0){
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				//GTIN-14
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				if($p_getType){
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					return 'GTIN-14';
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				}else{
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					return (string)substr($sGTINCode,-14);
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				}
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			}else{
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				//EAN code
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				if($p_getType){
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				    return 'EAN';
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				}else{
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					return (string)substr($sGTINCode,($bReturnGTIN14 ? -14 : -13));
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				}
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			}
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		}else{
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			return FALSE;
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		}
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	}
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	public static function GTINCheckDigit($p_sGTINCode)
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	{
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		$iCalculation = 0;
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		for($i = 0; $i < (strlen($p_sGTINCode)-1); $i++){
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			$iCalculation += $i % 2 ? $p_sGTINCode[$i] * 1 :  $p_sGTINCode[$i] * 3;
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		}
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		if(substr(10-(substr($iCalculation,-1)), -1) != substr($p_sGTINCode, -1)){
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			$iCalculation = null;
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			$p_sGTINCode = null;
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			return FALSE;
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		}else{
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			$iCalculation = null;
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			$p_sGTINCode = null;
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			return TRUE;
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		}
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	}
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}
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?>