cURL

Not Curl.

cURL is a way you can hit a URL from your code to get a html response from it. its use for command line cURL from the php language.

php
//step1
$cSession = curl_init(); 
//step2
curl_setopt($cSession,CURLOPT_URL,"http://www.google.com/search?q=curl");
curl_setopt($cSession,CURLOPT_RETURNTRANSFER,true);
curl_setopt($cSession,CURLOPT_HEADER, false); 
//step3
$result=curl_exec($cSession);
//step4
curl_close($cSession);
//step5
echo $result;
?> 

step1: Initialize a curl session use curl_init().

step2: Set option for CURLOPT_URL. This value is the URL which we are sending the request to. Append a search term "curl" using parameter "q=". Set option for CURLOPT_RETURNTRANSFER, true will tell curl to return the string instead of print it out. Set option for CURLOPT_HEADER, false will tell curl to ignore the header in the return value.

step3: Execute the curl session using curl_exec().

step4: Close the curl session we have created.

step5: Output the return string.

public function curlCall($apiurl, $auth, $rflag)
{
    $ch = curl_init($apiurl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    if($auth == 'auth') { 
        curl_setopt($ch, CURLOPT_USERPWD, "passw:passw");
    } else {
        curl_setopt($ch, CURLOPT_USERPWD, "ss:ss1");
    }
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $dt = curl_exec($ch);        
    curl_close($ch);
    if($rflag != 1) {
        $dt = json_decode($dt,true);        
    }
    return $dt;
}

this is also use for authentication.and we can also set the user name password for authentication for function user you can see the

http://php.net/manual/en/ref.curl.php
http://www.startutorial.com/articles/view/php-curl