<"localhost"; 
$DBUSER="root"; 
$DBPWD=""; 
$DBNAME="ioslogin"; 
"Content-type:text/html;charset=utf-8"); 
  require_once "config.php"; 
  //连接数据库 
  $connection = mysql_connect($DBHOST,$DBUSER,$DBPWD); 
  $db_selecct = mysql_select_db($DBNAME); 
  $action = $_GET['action'];   //用来区分是登录还是注册 
  $user_name = $_GET['user_name'];  //GET方法方便用于调试 
  $user_pwd = $_GET['user_pwd']; 
  switch ($action) { 
    case "login": 
    $str = "select * from users where user_name='$user_name' and user_pwd='$user_pwd'"; 
    $result = mysql_query($str,$connection); 
    @$rows = mysql_num_rows($result); 
    if($rows) { 
      $loginFlag = "1";  //登录成功 
    } 
    else { 
      $loginFlag = "0";  //登录失败 
    } 
    $returnArr = array("loginFlag" => $loginFlag); 
    echo json_encode($returnArr);  //输出json格式 
    break; 
 
    case "regist": 
    $str = "INSERT INTO users (user_name,user_pwd) values ('$user_name','$user_pwd')"; 
    $result = mysql_query($str,$connection); 
    if($result) { 
      $registFlag = "1"; //注册成功 
    } 
    else { 
      $registFlag = "0"; //注册失败 
    } 
    $returnArr = array("registFlag" => $registFlag); 
    echo json_encode($returnArr); 
    break; 
 
    default : 
    echo "登录方式错误"; 
    return false; 
    break; 
  } 
  mysql_close($connection); 
"color: #3366ff">localhost/iosLogin/index.php?action=login&user_name=admin&user_pwd=admin

其中iosLogin是PHP项目名称，有输出json就差不多是正确的。

iOS+PHP 注册登录系统（二） iOS部分
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