REST API示例

如果你现在正使用iphone、Android以及Web等多种平台工作，请看一下这篇文章，它会告诉你如何使用PHP创建RESTful API。Representational state transfer (REST) 是一个用于向不同应用分发数据的软件系统。Web服务系统会以JSON或者XML方式响应状态码。

REST API处理流程

数据库

数据库表users包含了user_id, user_fullname, user_email, user_password 和 user_status字段，十分简单。

CREATE TABLE IF NOT EXISTS `users`(`user_id` int(11) NOT NULL AUTO_INCREMENT,`user_fullname` varchar(25) NOT NULL,`user_email` varchar(50) NOT NULL,`user_password` varchar(50) NOT NULL,`user_status` tinyint(1) NOT NULL DEFAULT '0',PRIMARY KEY (`user_id`)) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

Rest API类：api.php

代码十分简单，你需要修改数据库配置信息，如数据库名、数据库账户以及密码。

require_once("Rest.inc.php");
class API extends REST{public $data = "";const DB_SERVER = "localhost";const DB_USER = "Database_Username";const DB_PASSWORD = "Database_Password";const DB = "Database_Name";private $db = NULL;public function __construct(){parent::__construct();// Init parent contructor$this->dbConnect();// Initiate Database connection}//Database connectionprivate function dbConnect(){$this->db = mysql_connect(self::DB_SERVER,self::DB_USER,self::DB_PASSWORD);if($this->db)mysql_select_db(self::DB,$this->db);}//Public method for access api.//This method dynmically call the method based on the query stringpublic function processApi(){$func = strtolower(trim(str_replace("/","",$_REQUEST['rquest'])));if((int)method_exists($this,$func) > 0)$this->$func();else$this->response('',404);// If the method not exist with in this class, response would be "Page not found".}private function login(){..............}private function users(){..............}private function deleteUser(){.............}//Encode array into JSONprivate function json($data){if(is_array($data)){return json_encode($data);}}
}

       // Initiiate Library$api = new API;$api->processApi();

提交登陆

通过访问REST API地址http://localhost/rest/login/ 显示从users表中查询出的用户数据。Restful API 的登录状态是根据状态码工作的。如果状态码为200，则登陆成功；否则状态码为204，会显示失败信息。更多的状态码信息请查看示例文件中的Rest.inc.php。

private function login(){// Cross validation if the request method is POST else it will return "Not Acceptable" statusif($this->get_request_method() != "POST"){$this->response('',406);}$email = $this->_request['email'];$password = $this->_request['pwd'];// Input validationsif(!empty($email) and !empty($password)){if(filter_var($email, FILTER_VALIDATE_EMAIL)){$sql = mysql_query("SELECT user_id, user_fullname, user_email FROM users WHERE user_email = '$email' AND user_password = '".md5($password)."' LIMIT 1", $this->db);if(mysql_num_rows($sql) > 0){$result = mysql_fetch_array($sql,MYSQL_ASSOC);// If success everythig is good send header as "OK" and user details$this->response($this->json($result), 200);}$this->response('', 204); // If no records "No Content" status}}// If invalid inputs "Bad Request" status message and reason$error = array('status' => "Failed", "msg" => "Invalid Email address or Password");$this->response($this->json($error), 400);}

获取用户信息

通过访问REST API 地址http://localhost/rest/users/ 获取用户的信息。

 private function users(){// Cross validation if the request method is GET else it will return "Not Acceptable" statusif($this->get_request_method() != "GET"){$this->response('',406);}$sql = mysql_query("SELECT user_id, user_fullname, user_email FROM users WHERE user_status = 1", $this->db);if(mysql_num_rows($sql) > 0){$result = array();while($rlt = mysql_fetch_array($sql,MYSQL_ASSOC)){$result[] = $rlt;}// If success everythig is good send header as "OK" and return list of users in JSON format$this->response($this->json($result), 200);}$this->response('',204); // If no records "No Content" status
}

删除用户信息

根据user_id删除特定用户的信息，只需要访问REST API地址http://localhost/rest/deleteUser/

private function deleteUser(){if($this->get_request_method() != "DELETE"){$this->response('',406);}$id = (int)$this->_request['id'];if($id > 0){mysql_query("DELETE FROM users WHERE user_id = $id");$success = array('status' => "Success", "msg" => "Successfully one record deleted.");$this->response($this->json($success),200);}else{$this->response('',204); // If no records "No Content" status}
}

Chrome拓展

测试PHP restful API 响应的一个chrome的插件为Advanced REST client Application

.htaccess code
使用.htaccess使URL更加友好。在demo示例中修改htaccess.txt to .htaccess。

<IfModule mod_rewrite.c>RewriteEngine OnRewriteCond %{REQUEST_FILENAME} !-dRewriteCond %{REQUEST_FILENAME} !-sRewriteRule ^(.*)$ api.php?rquest=$1 [QSA,NC,L]RewriteCond %{REQUEST_FILENAME} -dRewriteRule ^(.*)$ api.php [QSA,NC,L]RewriteCond %{REQUEST_FILENAME} -sRewriteRule ^(.*)$ api.php [QSA,NC,L]
</IfModule>

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