From the Facebook docs,
For creating an ad from Page post ( boosting a post ), you will first need to create the creative for that ad from the post.
See the doc page on how to create ad adcreatives. Search for Create an ad from an existing page post
use FacebookAds\Object\AdCreative;
use FacebookAds\Object\Fields\AdCreativeFields;
$creative = new AdCreative(null, 'act_<AD_ACCOUNT_ID>');
$creative->setData(array(
AdCreativeFields::NAME => 'Sample Promoted Post',
AdCreativeFields::OBJECT_STORY_ID => <POST_ID>,
));
$creative->create();
After that you will need to create an ad using that creative ad.
Creating ads from API with creative id
require __DIR__ . '/vendor/autoload.php';
use FacebookAds\Object\AdAccount;
use FacebookAds\Object\Ad;
use FacebookAds\Api;
use FacebookAds\Logger\CurlLogger;
$access_token = '<ACCESS_TOKEN>';
$app_secret = '<APP_SECRET>';
$app_id = '<APP_ID>';
$id = '<AD_ACCOUNT_ID>';
$api = Api::init($app_id, $app_secret, $access_token);
$api->setLogger(new CurlLogger());
$fields = array(
);
$params = array(
'name' => 'My Ad',
'adset_id' => '<adSetID>',
'creative' => array('creative_id' => '<adCreativeID>'),
'status' => 'PAUSED',
);
echo json_encode((new AdAccount($id))->createAd(
$fields,
$params
)->exportAllData(), JSON_PRETTY_PRINT);
The examples on the above are using Facebook PHP Business SDK, but you can make the calls using the Facebook PHP Graph SDK with the same parameters.
See the respective SDK files for finding the exact API parameters name.
For example : the Business SDK parameter
AdCreativeFields::OBJECT_STORY_ID is object_story_id as the API parameter.
Hope that helps
