CURL Request problem

I am trying to verify the paypal pdt information.

I generated my mockup form and submitted it. IT worked and returned the information too.

I tried the same thing making curl request. But my cur request is returning blank to me.

my mockup form:

<form method="post" action="https://sandbox.paypal.com/cgi-bin/webscr">
    <input type="hidden" nam开发者_运维技巧e="cmd" value="_notify-synch"/>
    <input type="hidden" name="at" value="-----"/>
    <input type="hidden" name="tx" value="-----"/>
    <input type="submit" value="Test"/>
</form>

My CURL REQ Code:

$arrData = array(
    'tx'    => '----',
    'cmd'   => '_notify-synch',
    'at'    => '-----'
);
    $ch = curl_init( 'https://sandbox.paypal.com/cgi-bin/webscr' );
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1) ;
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $arrData);
    $strCurlResult = curl_exec($ch);
    curl_close( $ch );
    return $strCurlResult;

EDIT:

ON tracking curl error i found following message:

SSL: certificate subject name 'www.sandbox.paypal.com' does not match target host name 'sandbox.paypal.com'

In fact, you can just disable peer HOST verification. In some PHP/cURL version, just disabling PEER is not enough:

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);

From the docs:

CURLOPT_SSL_VERIFYHOST: 1 to check the existence of a common name in the SSL peer certificate. 2 to check the existence of a common name and also verify that it matches the hostname provided. In production environments the value of this option should be kept at 2 (default value).

Change: $ch = curl_init( 'https://sandbox.paypal.com/cgi-bin/webscr' );
To: $ch = curl_init( 'https://www.sandbox.paypal.com/cgi-bin/webscr' );

Reason: the certificate for www.sandbox.paypal.com is not valid for sandbox.paypal.com.
Make the same change in your form's 'action' as well, by the way.

You need to tell cURL not to verify the SSL certificate. This can be done by setting a cURL option:

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

More information here:

http://php.net/manual/en/function.curl-setopt.php

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

though the above works it's not recommended.

as robert said

Change:

$ch = curl_init( 'https://sandbox.paypal.com/cgi-bin/webscr' );

To:

$ch = curl_init( 'https://www.sandbox.paypal.com/cgi-bin/webscr' );

Send it as string:

$arrData = array(
    'tx'    => '----',
    'cmd'   => '_notify-synch',
    'at'    => '-----'
);

$fields_string = "";

foreach($arrData as $key=>$value) 
    $fields_string .= $key.'='.$value.'&';

rtrim($fields_string,'&');

$ch = curl_init( 'https://sandbox.paypal.com/cgi-bin/webscr' );
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1) ;
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields_string);
$strCurlResult = curl_exec($ch);
curl_close( $ch );
return $strCurlResult;