Facebook send notification from php -

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i make website facebook notifications. tried send notification account. here code:

require 'facebook/autoload.php';      $facebook = new facebook\facebook(array(       'appid'  => fb_app_id,       'secret' => fb_app_secret,     ));       $post = $facebook->api('/' . $user['uid'] . '/notifications/', 'post/v2.2/',  array(       'access_token' => fb_app_id.'|'.fb_app_secret,       'href' => "http://mydomainlink.com",  //this link app's root, don't think works, seems link app's canvas page       'template' => 'max 180 characters',       'ref' => 'notification sent '.date("y-m-d g:i:s") //this facebook's insight     ));

and result:

fatal error: uncaught exception 'facebook\exceptions\facebooksdkexception' message 'required "app_id" key not supplied in config , not find fallback environment variable "facebook_app_id"' in /var/www/webpages/facebook/facebook.php:133 stack trace: #0 /var/www/webpages/fbnotify.php(14): facebook\facebook->__construct(array) #1 {main} thrown in /var/www/webpages/facebook/facebook.php on line 133

the users login website facebook, can userid there.


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