Array to String Conversion error on passing multi-dimential array to CURLOPT_POSTFIELDS

Question

Hope you are doing really great. I want to pass the multi-dimential as raw-data to my cURL request. But When I try to pass the array to CURLOPT_POSTFIELDS it gives me an error for Array to String Conversion.

When I am trying to pass the array like:

    $post_data = [
        "date"=> $_POST['date'],
        "items" => $plan_details,
        "form" => [
            "clientName" => [
                "name"      => $_POST['form_data'][0]['clientName'],
                "mobile"    => $_POST['form_data'][0]['mobile'],
            ],
            "clientAddress" => [
                "line"      => $_POST['form_data'][0]['addressLine'],
                "city"      => $_POST['form_data'][0]['addressCity'],
                "state"     => $_POST['form_data'][0]['addressState'],
                "country"   => "",
                "pincode"   => ""
            ],
            "clientGST" => [
                "companyName"   => "",
                "gstNo"         => ""
            ],
        ]
    ];

And the cURL request:

    curl_setopt_array($curl, array(
      CURLOPT_URL => "<URL>",
      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     => $post_data,
      CURLOPT_HTTPHEADER     => array(
            "Authorization: Bearer <key>"
        ),
    ));

How can I pass the Multi-Dimential Array to CURLOPT_POSTFIELDS?

what POST formats does the target API support? does it support multipart/form-data ? does it support x-www-form-urlencoded ? does it support application/json ? — hanshenrik
– hanshenrik, Commented Oct 18, 2021 at 12:23
Thank you @hanshenrik. The catch was Content-Type: application/json. I have kept it in CURLOPT_HTTPHEADER and it works fine now. — Malav Vasita
– Malav Vasita, Commented Oct 19, 2021 at 4:54
the code you provided above won't work with an API requiring application/json, you would need CURLOPT_POSTFIELDS => json_encode($post_data), for that — hanshenrik
– hanshenrik, Commented Oct 19, 2021 at 5:31
Correct. I just forgot to mention that. We need to json_encode the data and then provide the Content-type. — Malav Vasita
– Malav Vasita, Commented Oct 19, 2021 at 5:36

Pavel Třupek · Accepted Answer · 2021-10-18 12:20:27Z

1

You can use http_build_query function to build postfields string.

answered Oct 18, 2021 at 12:20

Pavel Třupek

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2 Comments

Malav Vasita Over a year ago

Thank you for your help @pavel-třupek but the API server was not accepting the string we built with the http_build_query so the passing of the Content-type in headers worked for me.

Pavel Třupek Over a year ago

I thought you want to encode array into post data parameters, not json encoded.

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