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<?php
namespace Faker\Provider;
/**
* @see http://en.wikipedia.org/wiki/EAN-13
* @see http://en.wikipedia.org/wiki/ISBN
*/
class Barcode extends Base
{
private function ean($length = 13)
{
$code = static::numerify(str_repeat('#', $length - 1));
return $code . static::eanChecksum($code);
}
/**
* Utility function for computing EAN checksums
*
* @param string $input
*
* @return integer
*/
protected static function eanChecksum($input)
{
$sequence = (strlen($input) + 1) === 8 ? array(3, 1) : array(1, 3);
$sums = 0;
foreach (str_split($input) as $n => $digit) {
$sums += $digit * $sequence[$n % 2];
}
return (10 - $sums % 10) % 10;
}
/**
* ISBN-10 check digit
* @link http://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digits
*
* @param string $input ISBN without check-digit
* @throws \LengthException When wrong input length passed
*
* @return integer Check digit
*/
protected static function isbnChecksum($input)
{
// We're calculating check digit for ISBN-10
// so, the length of the input should be 9
$length = 9;
if (strlen($input) !== $length) {
throw new \LengthException(sprintf('Input length should be equal to %d', $length));
}
$digits = str_split($input);
array_walk(
$digits,
function (&$digit, $position) {
$digit = (10 - $position) * $digit;
}
);
$result = (11 - array_sum($digits) % 11) % 11;
// 10 is replaced by X
return ($result < 10)?$result:'X';
}
/**
* Get a random EAN13 barcode.
* @return string
* @example '4006381333931'
*/
public function ean13()
{
return $this->ean(13);
}
/**
* Get a random EAN8 barcode.
* @return string
* @example '73513537'
*/
public function ean8()
{
return $this->ean(8);
}
/**
* Get a random ISBN-10 code
* @link http://en.wikipedia.org/wiki/International_Standard_Book_Number
*
* @return string
* @example '4881416324'
*/
public function isbn10()
{
$code = static::numerify(str_repeat('#', 9));
return $code . static::isbnChecksum($code);
}
/**
* Get a random ISBN-13 code
* @link http://en.wikipedia.org/wiki/International_Standard_Book_Number
*
* @return string
* @example '9790404436093'
*/
public function isbn13()
{
$code = '97' . static::numberBetween(8, 9) . static::numerify(str_repeat('#', 9));
return $code . static::eanChecksum($code);
}
}