Posting an Event to Page Wall with PHP - php

Question

I've been knocking my head against a wall for two weeks now, poring over the net, poring over stackoverflow, and repeatedly testing and failing to get a script together to post an event to a Fan Page. I've finally gotten a script that effectively creates the event, but it doesn't appear on the page.
After DMCS pointed me along to the PAGE access tokens, I fiddled about to generate them. Now, the problem is that the event appears on my personal wall, not the page wall I'm targeting. Can anyone see what I'm missing?
Here's the script after the latest edits:
<?php
$app_id = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
$app_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
$my_url = "http://xxxxxxxxxxxxxxxxxxxxxx.com/testfiles/fbeventform.php";
//Going to get the PAGE access code
//First to get USER Access Code
session_start();
$code = $_REQUEST["code"];
if(empty($code)) {
$_SESSION['state'] = md5(uniqid(rand(), TRUE)); //CSRF protection
$dialog_url = "https://www.facebook.com/dialog/oauth?client_id="
. $app_id . "&redirect_uri=" . urlencode($my_url) . "&state="
. $_SESSION['state'] . "&scope=create_event&scope=manage_pages";
echo("<script> top.location.href='" . $dialog_url . "'</script>");
}
if($_REQUEST['state'] == $_SESSION['state']) {
$token_url = "https://graph.facebook.com/oauth/access_token?"
. "client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url)
. "&client_secret=" . $app_secret . "&code=" . $code;
$access_token = #file_get_contents($token_url);
$params = null;
parse_str($access_token, $params);
$graph_url = "https://graph.facebook.com/me?access_token="
. $params['access_token'];
$user = json_decode(file_get_contents($graph_url));
echo("Hello " . $user->name);
}
else {
echo("The state does not match. You may be a victim of CSRF.");
}
echo '<hr />' . $access_token;
//Now, getting the PAGE Access token, using the user access token
$page_token_url = "https://graph.facebook.com/" . $page_id . "?fields=access_token&" . $access_token;
$response = file_get_contents($page_token_url);
// Parse the return value and get the Page access token
$resp_obj = json_decode($response,true);
$page_access_token = $resp_obj['access_token'];
echo '<hr />' . $page_access_token;
//Post the event--here's the form function
if( !empty($_POST) && (empty($_POST['name']) || empty($_POST['start_time']) || empty($_POST['end_time'])) ) {
$msg = "Please check your inputs!";
} elseif(!empty($_POST)) {
$url = "https://graph.facebook.com/" . $page_id . "/events?" . $access_token;
$params = array();
// Prepare Event fields
foreach($_POST as $key=>$value)
if(strlen($value))
$params[$key] = $value;
// Check if we have an image
if( isset($_FILES) && !empty($_FILES['picture']['name']) ) {
$uploaddir = './upload/';
$uploadfile = $uploaddir . basename($_FILES['picture']['name']);
if (move_uploaded_file($_FILES['picture']['tmp_name'], $uploadfile)) {
$params['picture'] = "#" . realpath($uploadfile);
}
}
// Start the Graph API call
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
$result = curl_exec($ch);
$decoded = json_decode($result, true);
curl_close($ch);
if(is_array($decoded) && isset($decoded['id'])) {
// Event created successfully, now we can
// a) save event id to DB AND/OR
// b) show success message AND/OR
// c) optionally, delete image from our server (if any)
$msg = "Event created successfully: {$decoded['id']}";
}
}
?>
<form enctype="multipart/form-data" action="" method="post">
<p><label for="name">Event Name</label><input type="text" name="name" value="a" /></p>
<p><label for="description">Event Description</label><textarea name="description"></textarea></p>
<p><label for="location">Location</label><input type="text" name="location" value="" /></p>
<p><label for="">Start Time</label><input type="text" name="start_time" value="<?php echo date('Y-m-d H:i:s'); ?>" /></p>
<p><label for="end_time">End Time</label><input type="text" name="end_time" value="<?php echo date('Y-m-d H:i:s', mktime(0, 0, 0, date("m") , date("d")+1, date("Y"))); ?>" /></p>
<p><label for="picture">Event Picture</label><input type="file" name="picture" /></p>
<p>
<label for="privacy_type">Privacy</label>
<input type="radio" name="privacy_type" value="OPEN" checked='checked'/>Open
<input type="radio" name="privacy_type" value="CLOSED" />Closed
<input type="radio" name="privacy_type" value="SECRET" />Secret
</p>
<p><input type="submit" value="Create Event" /></p>
</form>
</body>
</html>
This effectively creates the event, but it doesn't appear on the page wall I'm targetting. I'm really at the end of my rope over this...
Any and all help is appreciated, and I will be happy to post final results for future users!

Answer 1

Debug the access token you're using at https://developers.facebook.com/tools/lint and ensure you have a PAGE access token and not a USER access token.
For getting a page access token, see "Page Login" part of https://developers.facebook.com/docs/authentication/