一步一步学swift之：自己写Api接口-PHP

想要自己一个人完成app，那么后台接口也必须自己动动手。不用担心，其实很简单的，给自己信心！
下面就以登录注册为例，做一个api接口

首先在mac上搭建PHP环境，下载 MAMP Pro for Mac 3.4 破解版：
http://www.ifunmac.com/2015/08/mamp-pro-3-4/ 即可一键安装Apache/PHP/MySQL开发环境。简单吧。

有了环境就可以写代码了：

首先写一个Config.php （配置数据库）

<?php

//定义数据库连接所需的变量
define("DB_HOST", "localhost");
define("DB_USER", "root");
define("DB_PASSWORD", "master12!");
define("DB_DATABASE", "loginAPI");

?>

写一个DB_Connect.php（用于连接数据库）

<?php

class DB_Connect
{
public $con;

function __construct()
{

}

function __destruct()
{
// $this->close();
}

//连接数据库
public function connect()
{
require_once 'include/Config.php';
//连接mysql
$this->con = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE) or die(mysqli_error($this->con));
if (mysqli_connect_errno()) {
die("Database connection failed");
}

// 返回 database handler
return $this->con;
}

//关闭数据连接
public function close()
{
mysqli_close($this->con);
}

}

?>

再来一个：DB_Functions.php （用来封装 执行sql后 返回数据的方法）

<?php

class DB_Functions {

private $db;

// constructor
function __construct() {
require_once 'DB_Connect.php';
// connecting to database
$this->db = new DB_Connect();
$this->db->connect();
}

// destructor
function __destruct() {

}

/**
* 添加用户信息
*/
public function storeUser($name, $email, $password) {
$uuid = uniqid('', true);
$hash = $this->hashSSHA($password);
$encrypted_password = $hash["encrypted"]; // 加密后的密文
$salt = $hash["salt"]; // salt
$result = mysqli_query($this->db->con,"INSERT INTO users(unique_id, name, email, encrypted_password, salt, created_at) VALUES('$uuid', '$name', '$email', '$encrypted_password', '$salt', NOW())");
// 检查结果
if ($result) {
// 获取用户信息
$uid = mysqli_insert_id($this->db->con); // 获取最新的id
$result = mysqli_query($this->db->con,"SELECT * FROM users WHERE uid = $uid");
//返回刚插入的用户信息
return mysqli_fetch_array($result);
} else {
return false;
}
}

/**
* 通过email和password获取用户信息
*/
public function getUserByEmailAndPassword($email, $password) {
$result = mysqli_query($this->db->con,"SELECT * FROM users WHERE email = '$email'") or die(mysqli_connect_errno());
// check for result
$no_of_rows = mysqli_num_rows($result);
if ($no_of_rows > 0) {
$result = mysqli_fetch_array($result);
$salt = $result['salt'];
$encrypted_password = $result['encrypted_password'];
$hash = $this->checkhashSSHA($salt, $password);
// check for password
if ($encrypted_password == $hash) {
return $result;
}
} else {
return false;
}
}

/**
* 通过email判断用户是否存在
*/
public function isUserExisted($email) {
$result = mysqli_query($this->db->con,"SELECT email from users WHERE email = '$email'");
$no_of_rows = mysqli_num_rows($result);
if ($no_of_rows > 0) {
// 用户存在
return true;
} else {
//用户不存在
return false;
}
}

/**
* 加密
* @param password
* returns salt and encrypted password
*/
public function hashSSHA($password) {

$salt = sha1(rand());
$salt = substr($salt, 0, 10);
$encrypted = base64_encode(sha1($password . $salt, true) . $salt);
$hash = array("salt" => $salt, "encrypted" => $encrypted);
return $hash;
}

/**
* 解密
* @param salt, password
* returns hash string
*/
public function checkhashSSHA($salt, $password) {

$hash = base64_encode(sha1($password . $salt, true) . $salt);

return $hash;
}

}

?>

在Index.php调用并输出返回值（这个文件地址就是接口的访问地址）

<?php

if (isset($_POST['tag']) && $_POST['tag'] != '') {
// tag是接口请求时post的值（方法名称），用来区别调用方法
$tag = $_POST['tag'];

//引用DB_Functions.php
require_once 'include/DB_Functions.php';
$db = new DB_Functions();

// 定义输入数组
$response = array("tag" => $tag, "error" => FALSE);

// 判断tag值
if ($tag == 'login') {
//获取login方法的post参数
$email = $_POST['email'];
$password = $_POST['password'];

// 通过email 和password获取用户信息
$user = $db->getUserByEmailAndPassword($email, $password);
if ($user != false) {
//找到用户信息
$response["error"] = FALSE;
$response["uid"] = $user["unique_id"];
$response["user"]["name"] = $user["name"];
$response["user"]["email"] = $user["email"];
$response["user"]["created_at"] = $user["created_at"];
$response["user"]["updated_at"] = $user["updated_at"];
echo json_encode($response);
} else {
//没有找到用户信息
//输出错误信息
$response["error"] = TRUE;
$response["error_msg"] = "帐号或密码不正确!";
echo json_encode($response);
}
} else if ($tag == 'register') {
//注册帐号
$name = $_POST['name'];
$email = $_POST['email'];
$password = $_POST['password'];

// 判断用户是否存在
if ($db->isUserExisted($email)) {
// 如果用户存在就返错误提示
$response["error"] = TRUE;
$response["error_msg"] = "用户已存在";
echo json_encode($response);
} else {
// 新增用户
$user = $db->storeUser($name, $email, $password);
if ($user) {
//新增成功返回用户信息
$response["error"] = FALSE;
$response["uid"] = $user["unique_id"];
$response["user"]["name"] = $user["name"];
$response["user"]["email"] = $user["email"];
$response["user"]["created_at"] = $user["created_at"];
$response["user"]["updated_at"] = $user["updated_at"];
echo json_encode($response);
} else {
// 新增失败，返回错误信息
$response["error"] = TRUE;
$response["error_msg"] = "服务器繁忙，操作失败";
echo json_encode($response);
}
}
} else {
// tag值无效时
$response["error"] = TRUE;
$response["error_msg"] = "未找到您要的方法";
echo json_encode($response);
}
} else {
$response["error"] = TRUE;
$response["error_msg"] = "您的参数不正确!";
echo json_encode($response);
}
?>