Google Book Library based on ISBN

gistfile1.txt

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

/**
 * Description of ISBA Library
 *
 * @package     Library
 * @author      Jamael Tanveer Nayon <imjtnayon@gmail.com>
 * @author      Eftakhairul Islam <eftakhairul@gmail.com> http://eftakhairul.com
 * @website     Changebd.net
 */
class Isbn
{
    /**
     * @var string
     */
    private $_isbn;

    /**
     * @var string
     */
    protected $_isbnUrl;

    /**
     * @var array
     */
    protected $_bookDetails;

    /**
     * Init value
     */
    function __construct()
    {
        $this->_isbnUrl     = 'https://www.googleapis.com/books/v1/volumes?key=AIzaSyDKepjfaVBRcgsnPALw5s2UNyfOk-1FHUU&country=bd&q=isbn:';
        $this->_bookDetails = array();
    }

    /**
     * @param null $isbn
     * @return Isbn|null
     */
    function fetchBookInfo($isbn = null)
    {
        if (!empty($isbn)) $this->_isbn = $isbn;
        if (empty($this->_isbn)) return $this;

        $booklist = json_decode( file_get_contents('https://www.googleapis.com/books/v1/volumes?key=AIzaSyDKepjfaVBRcgsnPALw5s2UNyfOk-1FHUU&country=bd&q=isbn:' . $isbn) );

        if ($booklist->totalItems > 0) {

            $book     = json_decode(file_get_contents($booklist->items[0]->selfLink.'?key=AIzaSyDKepjfaVBRcgsnPALw5s2UNyfOk-1FHUU&country=bd'));
            $bookInfo = $book->volumeInfo;

            //Title
            $titles   = $bookInfo->title;

            //Author list
            $authors = 'Author is not available';

            if (isset($bookInfo->authors)) {
                $authors = '';
                $authorList = $bookInfo->authors;
                for ($i=0; $i < count($authorList); $i++) $authors.= $authorList[$i].', ';
                $authors    = rtrim($authors, ', ');
            }

            //Description
            $descriptions = 'Description is not available';
            if (isset($bookInfo->description)) $descriptions = $bookInfo->description;

            //Category list
            $categories   = array();
            $categoryList = $bookInfo->categories;
            for ($i=0; $i < count($categoryList); $i++) array_push($categories, $categoryList[$i]);

            //Image
            $image = $bookInfo->imageLinks->thumbnail;

            //ISBN
            if (isset($bookInfo->industryIdentifiers[1])) {
                $isbn = $bookInfo->industryIdentifiers[1]->identifier;
            } else {
                $isbn = $bookInfo->industryIdentifiers[0]->identifier;
            }

            $this->_bookDetails = array('title'          => $titles,
                                        'author'         => $authors,
                                        'description'    => $descriptions,
                                        'categories'     => $categories,
                                        'image'          => $image,
                                        'isbn'           => $isbn,
                                        );
        }

        return $this;
    }

    /**
     * Get all value;
     *
     * @return array
     */
    public function getAll()
    {
        return $this->_bookDetails;
    }

    /**
     * Set the isbn
     *
     * @param $isbn
     * @return Isbn|null
     */
    public function setIsbn($isbn)
    {
        $this->_isbn = $isbn;
        return $this;
    }

    /**
     * get the ISBN
     *
     * @return mixed
     */
    public function getIsbn()
    {
        return $this->_isbn;
    }

    /**
     * Set the url
     *
     * @param $isbnUrl
     * @return Isbn|null
     */
    public function setIsbnUrl($isbnUrl)
    {
        $this->_isbnUrl = $isbnUrl;
    }

    /**
     * Get the url
     *
     * @return string
     */
    public function getIsbnUrl()
    {
        return $this->_isbnUrl;
    }

    /*
     * Given an ISBN, returns true if it is valid
     * false if not.
     */
    function validateISBN($isbn)
    {
        $isbn = trim($isbn);
        $isbn = str_replace("-", "", $isbn);
        if (strlen($isbn) == 10) {
            $sum = $isbn[0]*10 + $isbn[1]*9 + $isbn[2]*8 + $isbn[3]*7 + $isbn[4]*6 + $isbn[5]*5 + $isbn[6]*4 + $isbn[7]*3 + $isbn[8]*2;
            $check_digit = $isbn[9];
            $test_check = 11 - ($sum % 11);
            if ($test_check == 10) $test_check = "X";

            if ($test_check == $check_digit) {
             return true;
            } else {
                return false;
            }
        }
        else if (strlen($isbn) == 13) {
            $sum = $isbn[0]*1 + $isbn[1]*3 + $isbn[2]*1 + $isbn[3]*3 + $isbn[4]*1 + $isbn[5]*3 + $isbn[6]*1 + $isbn[7]*3 + $isbn[8]*1 + $isbn[9]*3 + $isbn[10]*1 + $isbn[11]*3;
            $check_digit = $isbn[12];
            $test_check = 10 - ($sum % 10);
            if ($test_check == 10) $test_check = 0;

            if ($test_check == $check_digit) {
                return true;
            } else {
                return false;
            }
        }
        else return false;
    }

    /**
     * Remove all  unnecessary char form ISBN
     *
     * @param $isbnNum
     * @return string
     */
    private function filterISBN($isbnNum)
    {
        $isbnNum = trim($isbnNum);
        preg_match_all('!\d+!', $isbnNum, $matches);
        return implode("", $matches[0]);
    }
}