Getting an error although the product is added to the cart but error while redirecting

Question

1.00/5 (1 vote)

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PHP

<pre><?php

$curl = curl_init();
$proId  = $_GET['id'];

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.australia-southeast1.gcp.commercetools.com/commerce-tool-project/carts/cart-id',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
  "version" : 55,
  "actions" : [ {
    "action" : "addLineItem",
    "productId" : '.json_encode($proId).',
    "variantId" : 1,
    "quantity" : 1
  } ]
}',
  CURLOPT_HTTPHEADER => array(
    'Content-Type: application/json',
    'Authorization: Bearer '.$acces_token
  ),
));

$response = curl_exec($curl);


echo $response;
if(curl_getinfo($curl, CURLINFO_HTTP_CODE) != 200){
  echo "Something went wrong! Try again";
      }
      else{
       header("Location: cart.php");
    
      }

      curl_close($curl);

      ?>

the error is

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\commerce tool new\Addtocart.php:33) in C:\xampp\htdocs\commerce tool new\Addtocart.php on line 38

What I have tried:

tried removing echo response but then it stoped working

Posted 22-Aug-21 23:10pm

Priyanshu Sharma 2021

Updated 22-Aug-21 23:35pm

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Richard Deeming · Accepted Answer · 2021-08-22T23:35:00

Move echo $response; inside the if branch:

PHP

if(curl_getinfo($curl, CURLINFO_HTTP_CODE) != 200){
  echo $response;
  echo "Something went wrong! Try again";
}
else {
  header("Location: cart.php");
}

If you're redirecting, virtually nobody would see the body of the response, so there's no point echoing it in the else branch.