PHP实现的注册，登录及查询用户资料功能API接口示例

<?php
require 'conn.php';
header('Content-Type:text/html;charset=utf-8');
$action = $_GET['action'];
switch ($action) {
  //注册会员
  case"adduserinfo";
    $username = lib_replace_end_tag(trim($_GET['username']));
    $password2 = lib_replace_end_tag(trim($_GET['userpassword']));
    $password = md5("$password2" . ALL_PS);
    $email = lib_replace_end_tag(trim($_GET['email']));
    if ($username == '' || $password2 == '' || $password == '') {
      $res = urlencode("参数有误");
      exit(json_encode($res)); //有空信息
    }
    $sql = "select username from `member` where username='$username'";
    $query = mysql_query($sql, $conn);
    $count = mysql_num_rows($query);
    if ($count > 0) {
      exit(json_encode(1)); //返回1表示注册失败
    } else {
      $addsql = "insert into `member` (username,password,email) values ('$username','$password','$email')";
      mysql_query($addsql);
      exit(json_encode(0)); //返回0表示注册成功
    }
    break;
  //查询用户信息
  case"selectuserinfo";
    $username = lib_replace_end_tag($_GET['username']);
    $sql = "select id,username,nickname,mobile from `member` where username='$username'";
    $query = mysql_query($sql, $conn);
    $row = mysql_fetch_array($query);
    foreach ($row as $key => $v) {
      $res[$key] = urlencode($v);
    }
    exit(json_encode($res));
    break;
  //会员登录
  case"userlogin";
    $username = lib_replace_end_tag($_GET['username']);
    $password2 = lib_replace_end_tag(trim($_GET['userpassword']));
    $password = md5("$password2" . ALL_PS);
    $sqluser = "select id,username,password from `member` where username='" . $username . "' and password='" . $password . "'";
    $queryuser = mysql_query($sqluser);
    $rowuser = mysql_fetch_array($queryuser);
    if ($rowuser && is_array($rowuser) && !empty($rowuser)) {
      if ($rowuser['username'] == $username && $rowuser['password'] == $password) {
        if ($rowuser['password'] == $password) {
          $res = urlencode("登录成功");
          exit(json_encode($res));
        } else {
          $res = urlencode("密码错误");
          exit(json_encode($res));
        }
      } else {
        $res = urlencode("用户名不存在");
        exit(json_encode($res));
      }
    } else {
      $res = urlencode("用户名密码错误");
      exit(json_encode($res));
    }
    /*
     * 0：表示登录成功，1：表示密码错误，2：用户名不存在，3：用户名密码错误
     */
    break;
  default:
    exit(json_encode(error));
}
?>

<?php
header('Content-Type:text/html;charset=utf-8'); //避免输出乱码
function httpPost($url, $parms) {
  $url = $url . $parms;
  if (($ch = curl_init($url)) == false) {
    throw new Exception(sprintf("curl_init error for url %s.", $url));
  }
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_HEADER, 0);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 600);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
  if (is_array($parms)) {
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: multipart/form-data;'));
  }
  $postResult = @curl_exec($ch);
  $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  if ($postResult === false || $http_code != 200 || curl_errno($ch)) {
    $error = curl_error($ch);
    curl_close($ch);
    throw new Exception("HTTP POST FAILED:$error");
  } else {
    // $postResult=str_replace("\xEF\xBB\xBF", '', $postResult);
    switch (curl_getinfo($ch, CURLINFO_CONTENT_TYPE)) {
      case 'application/json':
        $postResult = json_decode($postResult);
        break;
    }
    curl_close($ch);
    return $postResult;
  }
}
$postUrl = "http://pujia.test.com/api/server.php";
$p=$_GET['p'];
if ($p =="selectuserinfo") {
  $username = $_GET['username'];
  $parms = "?action=selectuserinfo&username=" . $username . "";
} elseif ($p =="adduserinfo") {
  $username = $_GET['username'];
  $userpassword = $_GET['userpassword'];
  $parms = "?action=adduserinfo&username=" . $username . "&userpassword=" . $userpassword . "";
} elseif ($p =="userlogin") {
  $username = $_GET['username'];
  $userpassword = $_GET['userpassword'];
  $parms = "?action=userlogin&username=" . $username . "&userpassword=" . $userpassword . "";
}
$res = httpPost($postUrl, $parms); //$parms
$res = json_decode($res);
print_r(urldecode(json_encode($res)));
?>