<?php
$user = $_POST["Us"];
$pass= $_POST["Pss"];
$server='SERVER;$db='DB';
$connection = mysqli_connect($server,$user, $pass, $db);
if (!$connection)
{die ("Error de conexion a la base de datos ... n" . mysql_error ());}
else {echo 'Ok';}
?>

<?php
require('Conexion.php');
$username = $_GET["Us"];
$statement=mysqli_prepare($connection,"SELECT idTrabajador,`Nombre del Trabajador` FROM `tablausuario` WHERE `Usuario`=?");
mysqli_stmt_bind_param($statement,"s",$username);
mysqli_stmt_execute($statement);
mysqli_stmt_store_result($statement);
mysqli_stmt_bind_result($statement,$idTrabajador,$name);
$response = array();
$response["success"] = false;
while(mysqli_stmt_fetch($statement)){
$response["success"] = true;
$response["idTrabajador"] = $idTrabajador;
$response["Nombre del Trabajador"] = $name;
}
echo json_encode($response);
?>