pdo - errors in PHP Paypal pay request -


i have written library program user can search books. onto part user can select item it's id , own username. sets a payment on paypal user approve. i've made start i'm quite lost. book id , fill use details stored in database - price , title set payment.

the first issue i'm having following error:

undefined index: book_id

i error price, user , title.

here code payment:

try {       $dbh = new pdo('mysql:host=' . db_host . ';dbname=' . db_username, db_username, db_password); } catch   (pdoexception $e) {     print "error!: " . $e->getmessage() . "<br/>";     die(); }     $book =$_post["book_id"];   $user =$_post["user"];   $price =$_get["price"];   $title =$_get["title"];   $sth = $dbh->prepare("select title, price books2 b_id=$book"); $sth->execute();   $payer = new payer(); $payer->setpaymentmethod("paypal");   $item1 = new item(); $item1->setname($title)     ->setcurrency('usd')     ->setquantity(1)     ->setprice($price);     $details = new details();  $details->setshipping(1.5)      ->settax(1.7);   $transaction = new transaction(); $transaction->setamount($price)     ->setitemlist($item1)     ->setdescription("payment description")     ->setinvoicenumber(uniqid());   $baseurl = getbaseurl(); $redirecturls = new redirecturls(); $redirecturls->setreturnurl("$baseurl/review.php?success=true")     ->setcancelurl("$baseurl/payment.php?success=false");  $payment = new payment(); $payment->setintent("sale")     ->setpayer($user)     ->setredirecturls($redirecturls)     ->settransactions(array($transaction));      $execution = new paymentexecution(); $result = $payment->execute($execution, $apicontext);   $request = clone $payment;   try {     $payment->create($apicontext); } catch (exception $ex) {     resultprinter::printerror("created payment using paypal. please visit url approve.", "payment", null, $request, $ex);     exit(1); }   $approvalurl = $payment->getapprovallink();  resultprinter::printresult("setting payment using paypal. please visit url approve.", "payment", "<a href='$approvalurl' >$approvalurl</a>", $request, $payment);  return $payment;

can tell why why i'm getting these errors can make code work?

undefined index means parameter you're expecting not available. apparently form not including book_id field.

what can troubleshoot add following page receives post data see receiving.

echo '<pre />'; print_r($_post);

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