分享一例php實現API介面的程式碼，實現使用者的註冊、登入、查詢使用者資訊的功能，是學習PHP API開發的不錯例項，有興趣的朋友研究下吧。

PHP API介面的服務端部分

程式碼示例：

<?php
/**

*三目
* PHP開發API介面 服務端

*/
require 'conn.php';
header('Content-Type:text/html;charset=utf-8');
 
$action = $_GET['action'];
switch ($action) {
 
    //註冊會員
    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("引數有誤");

            exit(json_encode($res)); //有空資訊
        }
 
        $sql = "select username from `member` where username='$username'";
        $query = mysql-query.html target=_blank class=infotextkey>mysql_query()($sql, $conn);
        $count = mysql_num_rows($query);
 
        if ($count > 0) {
            exit(json_encode(1)); //返回1表示註冊失敗
        } else {
 
            $addsql = "insert into `member` (username,password,email) values ('$username','$password','$email')";
            mysql_query($addsql);
            exit(json_encode(0)); //返回0表示註冊成功
        }
        break;
 
 
    //查詢使用者資訊
    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;
    //會員登入
    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) {
                    $res = urlencode("登入成功");
                    exit(json_encode($res));
                } else {
                    $res = urlencode("密碼錯誤");
                    exit(json_encode($res));
                }
            } else {
                $res = urlencode("使用者名稱不存在");
                exit(json_encode($res));
            }
        } else {
            $res = urlencode("使用者名稱密碼錯誤");
            exit(json_encode($res));
        }
        /*
         * 0：表示登入成功，1：表示密碼錯誤，2：使用者名稱不存在，3：使用者名稱密碼錯誤
         */
        break;
 
    default:
        exit(json_encode(error));
  }

}

PHP API 客戶端部分

程式碼示例：

<?php
/**
* PHP API介面 客戶端
* edit: 辦公用品
*/
header('Content-Type:text/html;charset=utf-8'); //避免輸出亂碼
 
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)));

}