Following the previous ticket - Invite Friends (Groups, Pages, Events)

Hello,
Following the previous ticket, I did this to display the list of friends in invit.php

I am looking for but can not do that when you click on the "Invite" button, the invitation is sent to the person concerned.

<?php

//Code à ajouter aux fichiers invit.php						

		$id = $this->input->get('userid', null, 'int');

		$user = ES::user($id);

		$model = ES::model('Friends');

		$options = array('state' => SOCIAL_FRIENDS_STATE_FRIENDS , 'limit' => 2000);

		$friends = $model->getFriends($user->id, $options);

		//	print_r ($friends);

		?>

		<?php

		foreach ($friends as $element) {

			{

			$iduser =  $element->id;

			$idusername =  $element->username;				

			$fid=ES::user($iduser);

			}

		?>					

		<div style="float:left;height:80px;width:100%;border-bottom:solid 1px #d2d2d2">

		<div style="margin:10px;float:left"><?php echo '<img src="' . $fid->getAvatar() . '" />'; ?> </div>

		<div style="color:#000;font-weight:700;margin:5px 0px"><?php echo $idusername;?> </div>

		<div><?php echo $fid->getFieldValue('gender');?> </div>	

		<div style="float:left;color:#9e9e9e;"><?php echo $fid->getFieldValue('ADDRESS');?> </div>

			<div style="margin-left:350px;margin-top:-25px">

<button data-invite-button type="button" class="btn btn-sm btn-es-primary"><?php echo "Inviter"; ?></button>

			</div>

		</div>

        <?php 

}

?>

How should I do this?

Best regards.

Eric