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<?php declare(strict_types=1); |
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namespace JustSteveKing\GtinPHP; |
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class Gtin |
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{ |
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/** |
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* Check the length of a GTIN to make sure it is between 8 and 14 characters long |
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* @param mixed $value |
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* @return bool |
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*/ |
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public static function length($value): bool |
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{ |
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$value = (string) $value; |
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if (\strlen($value) <= 7 || \strlen($value) >= 15) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check that the GTIN is an integer - simply performs an is_int |
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* @param mixed $value |
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* @return bool |
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*/ |
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public static function integer($value): bool |
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{ |
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return is_int($value); |
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} |
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/** |
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* Inspects a GTIN to make sure the algorithm matches |
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* @param mixed $value |
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* @return bool |
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*/ |
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public static function inspect($value): bool |
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{ |
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$gtinString = (string) $value; |
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$checkDigitArray = []; |
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$gtinMath = [3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3]; |
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$modifier = 17 - (\strlen($gtinString) - 1); // First Digit in array |
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$checkDigit = \substr($gtinString, -1); // Get the check digit |
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$barcodeArray = \str_split($gtinString); // split gtin into an array |
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$tempCheckDigit = 0; |
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$tempCheckSum = 0; |
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// Run through and put digits into multiplication table |
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for ($i = 0; $i < (\strlen($gtinString) - 1); $i++) { |
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$checkDigitArray[$modifier + $i] = $barcodeArray[$i]; |
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} |
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// Calculate the sum of barcode digits |
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for ($i = $modifier; $i < 17; $i++) { |
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$tempCheckSum += ((int) $checkDigitArray[$i] * $gtinMath[$i]); |
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} |
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// Difference from rounded up to nearest 10 to final check digit calculation |
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$tempCheckDigit = (int)(\ceil($tempCheckSum / 10) * 10) - $tempCheckSum; |
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if ((int) $checkDigit !== $tempCheckDigit) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Validates an entire GTIN |
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* @param mixed $value |
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* @return bool |
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*/ |
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public static function validate($value): bool |
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{ |
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if (! Gtin::length($value)) { |
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return false; |
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} |
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if (! Gtin::integer($value)) { |
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return false; |
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} |
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if (! Gtin::inspect($value)) { |
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return false; |
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} |
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return true; |
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} |
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} |
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JustSteveKing /
gtin-php
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