Curl_Exec() Always Returns False

curl_exec() always returns false

Error checking and handling is the programmer's friend. Check the return values of the initializing and executing cURL functions. curl_error() and curl_errno() will contain further information in case of failure:

try {
    $ch = curl_init();

    // Check if initialization had gone wrong*    
    if ($ch === false) {
        throw new Exception('failed to initialize');
    }

    // Better to explicitly set URL
    curl_setopt($ch, CURLOPT_URL, 'http://example.com/');
    // That needs to be set; content will spill to STDOUT otherwise
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    // Set more options
    curl_setopt(/* ... */);
    
    $content = curl_exec($ch);

    // Check the return value of curl_exec(), too
    if ($content === false) {
        throw new Exception(curl_error($ch), curl_errno($ch));
    }

    // Check HTTP return code, too; might be something else than 200
    $httpReturnCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

    /* Process $content here */

} catch(Exception $e) {

    trigger_error(sprintf(
        'Curl failed with error #%d: %s',
        $e->getCode(), $e->getMessage()),
        E_USER_ERROR);

} finally {
    // Close curl handle unless it failed to initialize
    if (is_resource($ch)) {
        curl_close($ch);
    }
}

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^* The curl_init() manual states:

Returns a cURL handle on success, FALSE on errors.

I've observed the function to return FALSE when you're using its $url parameter and the domain could not be resolved. If the parameter is unused, the function might never return FALSE. Always check it anyways, though, since the manual doesn't clearly state what "errors" actually are.

PHP cURL returns FALSE on HTTPS

You can prevent cURL from trying to verify the SSL certificate by using CURLOPT_VERIFYPEER.

Also set the action in the URL:

$ch = curl_init();
$data = array('user' => 'xxx', 'password' => 'yyy');
curl_setopt($ch, CURLOPT_URL, 'https://coinroll.it/getbalance');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$result = curl_exec($ch);
echo $result;

php curl request always return false

Since you're using private IPs and (most likely a dummy ssl certificate), you need to disable ssl verification for your requests.

 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

But be aware that this is a security risk. So avoid this in a production environment

cURL PHP RESTful service always returning FALSE

$response is likely false because curl_exec() returns false (i.e., failure) into $result. Echo out curl_error($ch) (after the call to curl_exec) to see the cURL error, if that's the problem.

On a different note, I think your CURLOPT_POSTFIELDS is in an invalid format. You don't pass a JSON string to that.

This parameter can either be passed as
a urlencoded string like
'para1=val1¶2=val2&...' or as an
array with the field name as key and
field data as value.

-- PHP docs for curl_setopt()

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Update

The quick way to avoid the SSL error is to add this option:

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

You get an SSL verification error because cURL, unlike browsers, does not have a preloaded list of trusted certificate authorities (CAs), so no SSL certificates are trusted by default. The quick solution is to just accept certificates without verification by using the line above. The better solution is to manually add only the certificate(s) or CA(s) you want to accept. See this article on cURL and SSL for more information.

what would cause curl to return false when trying to access a local file?

After your curl execution, put something like this :

echo curl_getinfo($ch) . '<br/>';
echo curl_errno($ch) . '<br/>';
echo curl_error($ch) . '<br/>';

You'll see what failed during your curl execution.

More info : curl_getinfo curl_errno curl_error

PHP Curl Get Request Returning False

You need to urlencode() only the value parts of your query string, fields Postcode and Address1 in this case.

<?php

$ch = curl_init();  
//var_dump($url.$postData);
$requestUrl = "https://cleanlead.dlg.co.uk/?";
$requestUrl .= "circuit=public&fuseaction=lead&Campid=599&Suppid=571&Surveyid=5&Title=Mr&Forename=Adrian&Surname=Reut";
$requestUrl .= "&Address1=" . urlencode("8 Church Road Middlesex");
$requestUrl .= "&Finance_Insurance_PMI_CurrentlyHave=Yes";
$requestUrl .= "&Postcode=" . urlencode("UB3 2LH");
$requestUrl .= "&Finance_PMI_ThruCompany=No&TelephoneORMobile=2087976760&Age_Band=30-39";
curl_setopt($ch,CURLOPT_URL, $requestUrl);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_HEADER, false); 
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, false); 
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, false);   
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET'); 
$output=curl_exec($ch);
if (curl_error($ch)) {
    var_dump();
}
curl_close($ch);
var_dump($output);


?>

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