Post Image to the Facebook using Graph API by Givi

I can upload the image to the facebook acoount using below code:

<?php
    include_once "facebook.php";
    ini_set("display_errors",0);

    //configuring application to post.
    $app_id = "YOUR_APP_ID";
    $app_secret = "YOUR_APP_SECRET";
    $post_login_url = "YOUR_REDIRECT_URL";

    $code = $_REQUEST["code"];

    //Obtain the access_token with publish_stream permission
    if(empty($code)){
        $dialog_url= "http://www.facebook.com/dialog/oauth?"
                . "client_id=" .  $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                .  "&scope=publish_actions";
        echo("<script>top.location.href='" . $dialog_url
                . "'</script>");
    }
    else {
        $token_url="https://graph.facebook.com/oauth/access_token?"
                . "client_id=" . $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                . "&client_secret=" . $app_secret
                . "&code=" . $code;
        $response = file_get_contents($token_url);
        $params = null;
        parse_str($response, $params);
        $access_token = $params['access_token'];

        // Show photo upload form to user and post to the Graph URL
        $graph_url= "https://graph.facebook.com/me/photos?"
                . "access_token=" .$access_token;

        echo '<html><body>';
        echo '<form enctype="multipart/form-data" action="'
                .$graph_url .' "method="POST">';
        echo 'Please choose a photo: ';
        echo '<input name="source" type="file"><br/><br/>';
        echo '<input type="submit" value="Upload"/><br/>';
        echo '</form>';
        echo '</body></html>';
    }
?>

But as you can see, I am using form tag and submit button to post an image using the input type as File. But I don't want to browse for the image. I want to remove all the code for browsing and just want to give the source of the image to upload that image to facebook account.

Something Like below:

<?php
    include_once "facebook.php";
    ini_set("display_errors",0);

    //configuring application to post.
    $app_id = "YOUR_APP_ID";
    $app_secret = "YOUR_APP_SECRET";
    $post_login_url = "YOUR_REDIRECT_URL";

    $code = $_REQUEST["code"];

    //Obtain the access_token with publish_stream permission

    if(empty($code)){
        $dialog_url= "http://www.facebook.com/dialog/oauth?"
                . "client_id=" .  $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                .  "&scope=publish_actions";
        echo("<script>top.location.href='" . $dialog_url
                . "'</script>");
    }
    else {
        $token_url="https://graph.facebook.com/oauth/access_token?"
                . "client_id=" . $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                . "&client_secret=" . $app_secret
                . "&code=" . $code;
        $response = file_get_contents($token_url);
        $params = null;
        //echo "Response: $response<br>";
        parse_str($response, $params);
        $access_token = $params['access_token'];
    //  echo "Access Token: $access_token<br>"; 

        // Show photo upload form to user and post to the Graph URL
        $graph_url= "https://graph.facebook.com/me/photos?access_token=" .$access_token;

        echo '<html><body>';
        echo '<form action="'.$graph_url .'"method="POST">';
        //echo '<input name="source" type="file"><br/><br/>'; Putting img tag instead of file
        echo '<img src="'.get_template_directory_uri().'/download.php?f='.apply_filters('filter_if_add_to_cart',$image_link).'"><br/><br/>';
        echo '<input type="submit" value="Upload"/><br/>';
        echo '</form>';
        echo '</body></html>';
    }
?>

But I don't know how to do that. Can you please help me with this? Thank You,

Update: I have updated my code. Please see below for the updated Code:

<?php
    include_once "facebook.php";
    ini_set("display_errors",0);

    $img_src = $_SESSION['imgSrc'];

    //configuring application to post.
    $app_id = "YOUR_APP_ID";
    $app_secret = "YOUR_APP_SECRET";
    $post_login_url = "YOUR_REDIRECT_URL";

    $code = $_REQUEST["code"];

    //Obtain the access_token with publish_stream permission
    if(empty($code)){
        $dialog_url= "http://www.facebook.com/dialog/oauth?"
                . "client_id=" .  $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                .  "&scope=publish_actions";
        echo("<script>top.location.href='" . $dialog_url
                . "'</script>");
    }
    else {
        $token_url="https://graph.facebook.com/oauth/access_token?"
                . "client_id=" . $app_id
                . "&redirect_uri=" . urlencode( $post_login_url)
                . "&client_secret=" . $app_secret
                . "&code=" . $code;
        $response = file_get_contents($token_url);
        $params = null;
        //echo "Response: $response<br>";
        parse_str($response, $params);
        $access_token = $params['access_token'];

        //Posting Image to The Facebook

        $api_url = 'https://graph.facebook.com/v2.0/me/photos';
        $attachment =  array(
                'url'  => "{$img_src}",
                'access_token' => $access_token
        );
        $api_response = UseCurl($api_url, $attachment);
        $post_result = json_decode($api_response, TRUE);
        print_r($post_result);

        function UseCurl($url, $attachment){
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
            curl_setopt($ch, CURLOPT_POST, true);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $attachment);
            curl_setopt($ch, CURLOPT_HEADER, 0);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            $result = curl_exec($ch);
            curl_close ($ch);

            return $result;
        }
    }
?>

If you have images in the server that you wish to post, you can simply use the url parameter to upload the photo. Just like this-

$api_url = 'https://graph.facebook.com/v2.0/me/photos';
$attachment =  array(
   'url'  => "{image-url}",
   'access_token' => $access_token
);
$api_response = UseCurl($api_url, $attachment);
$post_result = json_decode($api_response, TRUE);
print_r($post_result);

function UseCurl($url, $attachment){
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
   curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
   curl_setopt($ch, CURLOPT_POST, true);
   curl_setopt($ch, CURLOPT_POSTFIELDS, $attachment);
   curl_setopt($ch, CURLOPT_HEADER, 0);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
   $result = curl_exec($ch);
   curl_close ($ch);

   return $result;
}