curl -X PUT --header 'Accept:application/json; charset=utf-8' http://localhost:8087/v2/servers/_defaultServer_/vhosts/_defaultVHost_/applications/encoder2/actions/restart --digest -u "user:password"

<?php
$url = 'http://localhost:8087/v2/servers/_defaultServer_/vhosts/_defaultVHost_/applications/mystream/actions/restart';
$username = 'user';
$pass = 'password';
$ch = curl_init();
                curl_setopt ( $ch, CURLOPT_URL, "$url");
                curl_setopt ( $ch, CURLOPT_POST, 1 );
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
                curl_setopt($ch, CURLOPT_USERNAME, "$username");
                curl_setopt($ch, CURLOPT_PASSWORD, "$password")
                curl_close ($ch);

?>