Created by SnippLeaf.com

EAN-13_example.php

<?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;
    }
}

if ( !function_exists('create_mfg_code') ) {
    function create_mfg_code($mfg_name)
    {
        $rand = mt_rand(00000, 99999);
        $code = initials( $mfg_name );
        $gen = $code . $rand;
        return substr( $gen, 0, -strlen($code) );
    }
}

if ( !function_exists('initials') ) {
    function initials($str) {
        $ret = null;
        foreach (explode(' ', $str) as $word) {
            $num = to_num(strtolower($word[0]));
            $ret .= $num;
        }
        return $ret;
    }
}

if ( !function_exists('to_num') ) {
    function to_num($data) {
        $alphabet = array( 'a', 'b', 'c', 'd', 'e',
                           'f', 'g', 'h', 'i', 'j',
                           'k', 'l', 'm', 'n', 'o',
                           'p', 'q', 'r', 's', 't',
                           'u', 'v', 'w', 'x', 'y',
                           'z'
                           );
        $alpha_flip = array_flip($alphabet);
        $return_value = -1;
        $length = strlen($data);
        for ($i = 0; $i < $length; $i++) {
            $return_value +=
                ($alpha_flip[$data[$i]] + 1) * pow(26, ($length - $i - 1));
        }
        return $return_value;
    }
}

// Create Number System
$number_system      = 17;
// Craete Manufactur Code
$mfg_code           = create_mfg_code( 'Gudang Timur' );
// Craete Product Code
$product_code       = substr(round(microtime(true)),0,5);
// Combine
$item_code          = $number_system . $mfg_code . $product_code;

echo "-------------" . PHP_EOL;
echo "Number System: " . $number_system . ' ('.strlen($number_system).')' . PHP_EOL;
echo "Manufactur Code: " . $mfg_code . ' ('.strlen($mfg_code).')' . PHP_EOL;
echo "Product Code: " . $product_code . ' ('.strlen($product_code).')' . PHP_EOL;
echo "Total Length: " . strlen($item_code) . PHP_EOL;
echo "-------------" . PHP_EOL;
$barcode = EAN13::create($item_code);
echo "Barcode: ". $barcode . PHP_EOL;