<?php
require_once('barcode.php');
const PREFIX = 8888;
for ($i = 0; $i < 10; $i++) {
$barcode = EAN13::create(PREFIX);
echo $barcode . "\n";
}
<?php
class EAN13 {
private $code = null;
private $prefix = false;
public function __construct ($prefix = false) {
$this->prefix = $prefix === false ? false : (string) $prefix;
}
public static function create($prefix = false) {
$barcode = new static($prefix);
return $barcode->generate();
}
public function generate()
{
// Generate random
$this->code = (string) mt_rand(100000000000, 999999999999); // 12 chars long
if ($this->prefix) {
$this->code = $this->prefix . $this->code;
$this->code = substr($this->code, 0, -strlen($this->prefix));
}
// Get latest digit
$this->code .= $this->getCheckDigit();
return $this->code;
}
private function getCheckDigit()
{
$codePartials = str_split($this->code);
$checkdigit = null;
$evenNumbers = 0;
$oddNumbers = 0;
foreach ($codePartials as $key => $value) {
if (($key + 1) % 2 == 0) { // Keys start from 0, We want the start to be 1
$evenNumbers += $value;
} else {
$oddNumbers += $value;
}
}
$evenNumbers = $evenNumbers * 3;
$total = $evenNumbers + $oddNumbers;
if ($total % 10 == 0) {
$checkdigit = 0;
} else {
$next_multiple = $total + (10 - $total % 10);
$checkdigit = $next_multiple - $total;
}
return $checkdigit;
}
}
