1. 首先，要设置一个入口文件

入口文件的话会引入到固定的api文件（如下）：

<?phpdefine("APPAPI_ALLOW_REQUEST_LOGIN", 'Y');  //是否允许传用户名密码参数的形式登录。如为Y则参数用户名密码参数和basic方式都可以，如为N就只能basic方式。//define("SITE_TEMPLATE_PATH", '/local/templates/mobile_app_api');    //如不定义，默认是local/templates/bitrix24。可以考虑将/local/templates/mobile_app留给h5前端展示用。新开/local/templates/mobile_app_api给api用。如不指定SITE_TEMPLATE_PATH直接IncludeComponent，则对组件代码进行debug时，会出现web端头部页面。
//require_once($_SERVER['DOCUMENT_ROOT'] . '/bitrix/header.php');  //需要模板页面Header('Access-Control-Allow-Origin: *');
Header('Access-Control-Allow-Headers: origin, content-type, accept');
Header('X-Content-Type-Options: nosniff');require("remote_auth.php");//app方式每次请求session_id()都会变，导致挂钩在session_id()下面的所有session信息如fix_session_id也都不认。所以登录完毕后要拿到session_id()，并在后续接口一起传给接口，接口再去指定session_id。
//$_REQUEST['org_sessid']='06q75330o31se1cf4d7vl1bdm4';
if(!empty($_REQUEST['org_sessid'])){$org_session_id=$_REQUEST['org_sessid'];session_id($org_session_id);session_start();//echo session_id();//echo "<pre>";print_r($_SESSION);exit;
}require_once($_SERVER["DOCUMENT_ROOT"] . "/bitrix/modules/main/include/prolog_before.php");   //无需模板页面
$APPLICATION->IncludeComponent("vdg:mobile.data", "", Array());exit;?>

2. 其次，在引入的组件的component.php中获取参数，确定模板的使用

如 “http://192.168.56.1:7070/vdg/app_api.php?mobile_action=appapi_designer_list&model=designerku“：

<?php
...
include_once(dirname(__FILE__) . "/functions.php");//引入类的方法的文件
...
if ($_REQUEST["mobile_action"])//Executing some action
{$APPLICATION->RestartBuffer();$action = $_REQUEST["mobile_action"];//CRestUtil::sendHeaders();  //跨域header$actionList = new Bitrix\Mobile\Action();$actionList->executeAction($action, $arParams);CMain::FinalActions();die();
}
elseif ($_REQUEST["captcha_sid"])//getting captcha image  通过 /vdg/app_api.php?captcha_sid=1 可以得到图形验证码。
{$APPLICATION->RestartBuffer();$actionList = new Bitrix\Mobile\Action();$actionList->executeAction("get_captcha", $arParams);die();
}
elseif ($_REQUEST["manifest_id"])//getting content of appcache manifest
{include($_SERVER["DOCUMENT_ROOT"] .\Bitrix\Main\Data\AppCacheManifest::MANIFEST_CHECK_FILE);die();
}
elseif(!$USER->IsAuthorized() || !$isSessidValid)
{$APPLICATION->RestartBuffer();header("HTTP/1.0 401 Not Authorized");if(Bitrix\MobileApp\Mobile::getInstance()->getInstance() != "android"){//header("Content-Type: application/x-javascript");header("Content-Type: application/json");header("BX-Authorize: ".bitrix_sessid());}jsonError('201', '请先登陆');   //echo json_encode(Array("status" => "failed", "bitrix_sessid"=>bitrix_sessid()));die();
}
?>

3. 然后，再具体的模板中运用类的方法根据参数获取相应的数据，并返回客户端结果

如果成果返回“ jsonSuccess(questions);”如果失败返回“jsonError(′201′,questions);”如果失败返回“ jsonError('201', questRes[“ERROR”]);”或其他错误讯息，当然最重要的，最重要的，最重要的还是类的方法(菜鸟一般写不出来，比如我)：

<?
/*** activity.php, 活动问答的API*/
class VActivity
{/*** 获取所有问题的列表** @return array()* @static*/public static function getQuestions($withAnswerCounts=false){global $DB, $USER;// if (!$USER->IsAuthorized()) {//     return array();// }$arSqls["SELECT"]=' ID,TITLE,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD ';//$arSqls["WHERE"]=" ID='".$DB->ForSql($questID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_question";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);$questions = array();$userIds = array();if ($dbRes){while ($arr_exp = $dbRes->Fetch()){$questions[]=$arr_exp;$userIds[] = $arr_exp["CREATED_BY"];}}$userDict = static::getUserDict($userIds);for($i = 0;$i<count($questions);$i++) {$questions[$i]["CREATED_BY_NAME"] = $userDict[$questions[$i]["CREATED_BY"]];if ($withAnswerCounts) {$questions[$i]["ANSWERS"] = count(static::getAnswers($questions[$i]["ID"], false));}}return $questions;}private static function getUserDict($userIds){$res = array();foreach($userIds as $key => $val) {$uRes = CUser::GetByID($val);$u = $uRes->Fetch();if ($u) {$name = $u["NAME"];if ($name) {$res[$val] = $name;}else {$login = $u["LOGIN"];$res[$val] = $login;}               }}return $res;}public static function getQuestion($questionID, $withUserName=true, $arSelect=""){global $DB, $USER;// if (!$USER->IsAuthorized()) {//     return array();// }if (empty($arSelect)) {$arSqls["SELECT"]=' ID,TITLE,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD ';} else {$arSqls["SELECT"]=' '.$arSelect.' ';}$arSqls["WHERE"]=" ID='".$DB->ForSql($questionID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_question WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);if ($dbRes){while ($arr_exp = $dbRes->Fetch()){ $quest = $arr_exp;if ($withUserName) {$userDict = static::getUserDict(array($arr_exp["CREATED_BY"]));$quest["CREATED_BY_NAME"] = $userDict[$arr_exp["CREATED_BY"]];}                return $quest;}}return array();}public static function getAnswer($answerID, $withLikes=true, $withUserName=true, $arSelect=''){global $DB, $USER;if (empty($arSelect)) {$arSqls["SELECT"]=' ID,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD ';} else {$arSqls["SELECT"] = ' '.$arSelect.' ';}$arSqls["WHERE"]=" ID='".$DB->ForSql($answerID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_answer WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);$answers = array();if ($dbRes){while ($item = $dbRes->Fetch()){$ansID = $item["ID"];if ($withUserName) {$userDict = static::getUserDict(array($item["CREATED_BY"]));$item["CREATED_BY_NAME"] = $userDict[$item["CREATED_BY"]];}if ($withLikes) {$likeRes = static::getLikes($ansID);$item["LIKES"] = $likeRes["LIKES"];}return $item;}}return array();}public static function getAnswers($questionID, $withLikes=true){global $DB, $USER;$arSqls["SELECT"]=' ID,QUESTION_ID,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD ';$arSqls["WHERE"]=" QUESTION_ID='".$DB->ForSql($questionID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_answer WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);$answers = array();$userIds = array();if ($dbRes){while ($item = $dbRes->Fetch()){$ansID = $item["ID"];$userIds[] = $item["CREATED_BY"];if ($withLikes) {$likeRes = static::getLikes($ansID);$item["LIKES"] = $likeRes["LIKES"];}                $answers[] = $item;}}$userDict = static::getUserDict($userIds);for($i = 0;$i<count($answers);$i++) {$answers[$i]["CREATED_BY_NAME"] = $userDict[$answers[$i]["CREATED_BY"]];}return $answers;}/*** 创建问题** @param int $answerID 回答ID* @return array("OK"=>true, "LIKES"=> array(), "ERROR"=>"")* @static*/public static function getLikes($answerID){$res = array("OK"=>true, "LIKES"=> array(), "ERROR"=>"");global $USER, $APPLICATION, $DB;// if (!$USER->IsAuthorized()) {//     $res["OK"] = false;//     $res["ERROR"] = "需要登录";//     return $res;// }if (!$answerID) {$res["OK"] = false;$res["ERROR"] = "非法答案："+$answerID;return $res;}$arSqls["SELECT"]=' USER_ID ';$arSqls["WHERE"]=" ANSWER_ID='".$DB->ForSql($answerID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_like WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);if ($dbRes){while ($item = $dbRes->Fetch()){ $res["LIKES"][] = $item["USER_ID"];}}return $res;}/*** 创建问题** @param array $arFields 问题字段列表。TITLE,CONTENT,REWARD* @return array("OK"=>true, "QUESTION_ID"=>0, "ERROR"=>"")* @static*/public static function createQuestion($arFields=array()){global $USER, $APPLICATION, $DB;$res = array("OK"=>true, "QUESTION_ID"=>0, "ERROR"=>"");if (!$USER->IsAuthorized()) {$res["OK"] = false;$res["ERROR"] = "需要登录";return $res;}if (!$arFields["TITLE"]) {$res["OK"] = false;$res["ERROR"] = "缺少标题";return $res;}if (!$arFields["CONTENT"]) {$res["OK"] = false;$res["ERROR"] = "缺少内容: "+print_r($arFields["CONTENT"], true);return $res;}$rewards = 0.00;if ($arFields["REWARD"]) {$rewards = FloatVal($arFields["REWARD"]);}$userID = $USER->GetID();$fromUser = $userID;$toUser = $userID;$strSql = "INSERT INTO v_act_question (TITLE,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD) VALUES ('".$arFields["TITLE"]."', '".$arFields["CONTENT"]."', ".$DB->CurrentTimeFunction()." , ".$DB->CurrentTimeFunction()." , '".$DB->ForSql($userID,11)."', ".$rewards." )";$DB->Query($strSql, false, "FILE: ".__FILE__."<br> LINE: ".__LINE__);$questID = IntVal($DB->LastID());if ($questID > 0) {$res["QUESTION_ID"] = $questID;static::addNotify("question", $fromUser, $toUser, "创建了问题：".$arFields["TITLE"]."；奖赏：￥".$arFields["REWARD"]);return $res;}$res["OK"] = false;$res["ERROR"] = "创建问题失败";return $res;}private static function addNotify($eventType, $fromUser, $toUser, $message) {CModule::IncludeModule("im");$arMessageFields = array("MESSAGE_TYPE" => IM_MESSAGE_SYSTEM,"TO_USER_ID" => intval($toUser),"FROM_USER_ID" => intval($fromUser),"NOTIFY_TYPE" => IM_NOTIFY_FROM,"NOTIFY_MODULE" => "main","NOTIFY_EVENT" => $eventType, //"rating_vote",//"NOTIFY_TAG" => "RATING|".($arParams['VALUE'] >= 0 ? "" : "DL|").$arParams['ENTITY_TYPE_ID']."|".$arParams['ENTITY_ID'],"NOTIFY_MESSAGE" => $message,"NOTIFY_MESSAGE_OUT" => $message);CIMNotify::Add($arMessageFields);}public static function addAnswer($questionID, $arFields=array()){global $USER, $APPLICATION, $DB;$res = array("OK"=>true, "ANSWER_ID"=>0, "ERROR"=>"");if (!$USER->IsAuthorized()) {$res["OK"] = false;$res["ERROR"] = "需要登录";return $res;}if ($questionID <= 0) {$res["OK"] = false;$res["ERROR"] = "缺少问题";return $res;}if (!$arFields["CONTENT"]) {$res["OK"] = false;$res["ERROR"] = "缺少内容";return $res;}$userID = $USER->GetID();$fromUser = $userID;$toUser = $userID;$questionTitle="";$quest = static::getQuestion($questionID, false, "TITLE, CREATED_BY");if ($quest) {$questionTitle = $quest["TITLE"];$toUser = IntVal($quest["CREATED_BY"]);}$strSql = "INSERT INTO v_act_answer (QUESTION_ID,CONTENT,DATE_CREATE,DATE_UPDATE,CREATED_BY,REWARD) VALUES ('".$DB->ForSql($questionID,11)."', '".$arFields["CONTENT"]."', ".$DB->CurrentTimeFunction()." , ".$DB->CurrentTimeFunction()." , '".$DB->ForSql($userID,11)."', 0.00 )";$DB->Query($strSql, false, "FILE: ".__FILE__."<br> LINE: ".__LINE__);$answerID = IntVal($DB->LastID());if ($answerID > 0) {$res["ANSWER_ID"] = $answerID;static::addNotify("answer", $fromUser, $toUser, "回答了一道问题：".$questionTitle);return $res;}$res["OK"] = false;$res["ERROR"] = "创建问题失败";return $res;}public static function addLike($answerID){$res = array("OK"=>true, "ERROR"=>"");global $USER, $APPLICATION, $DB;if (!$answerID) {$res["OK"] = false;$res["ERROR"] = "非法答案："+$answerID;return $res;}if (!$USER->IsAuthorized()) {$res["OK"] = false;$res["ERROR"] = "需要登录";return $res;}$userID = $USER->GetID();$fromUser = $userID;$toUser = $userID;$arSqls["SELECT"]=' USER_ID ';$arSqls["WHERE"]=" ANSWER_ID='".$DB->ForSql($answerID,11)."' AND USER_ID='".$DB->ForSql($userID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_like WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);if ($dbRes){while ($dbRes->Fetch()){return $res;}}$answer = static::getAnswer($answerID, false, "CREATED_BY");if ($answer) {$toUser = $answer["CREATED_BY"];}$strSql = "INSERT INTO v_act_like (ANSWER_ID,USER_ID) VALUES ('".$DB->ForSql($answerID,11)."', '".$DB->ForSql($userID,11)."')";$DB->Query($strSql, false, "FILE: ".__FILE__."<br> LINE: ".__LINE__);// $lastID = $DB->LastID();// if (!$lastID) {//     $res["OK"] = false;//     $res["ERROR"] = "出错："+print_r($lastID, true);//     return $res;// }static::addNotify("likes", $fromUser, $toUser, "对一个答案表示了喜欢。");return $res;}/*** 创建问题** @param array $questID 问题ID* @param array $arFields 问题字段列表。TITLE,CONTENT,REWARD* @return array("OK"=>true, "QUESTION_ID"=>0, "ERROR"=>"")* @static*/public static function updateQuestion($questID, $arFields = array()){$res = array("OK"=>true, "QUESTION_ID"=>$questID, "ERROR"=>"");global $USER, $APPLICATION, $DB;if (!$USER->IsAuthorized()) {$res["OK"] = false;$res["ERROR"] = "需要登录";return $res;}$userId = $USER->GetID();$arSqls["SELECT"]=' ID,CREATED_BY ';$arSqls["WHERE"]=" ID='".$DB->ForSql($questID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_question WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);$ques_info = array();if ($dbRes){while ($arr_exp = $dbRes->Fetch()){ $ques_info['CREATED_BY']=$arr_exp['CREATED_BY'];}}if(empty($ques_info)){$res["OK"] = false;$res["ERROR"] = '没找到该问题';return $res;}if($ques_info['CREATED_BY']!=$userId){$res["OK"] = false;$res["ERROR"] = '您不是问题的创建者';return $res;}$strSql = "UPDATE v_act_question SET DATE_UPDATE=".$DB->CurrentTimeFunction()."";if(!empty($arFields["TITLE"])){$strSql .= " ,TITLE='".$arFields["TITLE"]."' ";}if(!empty($arFields["CONTENT"])){$strSql .= " ,CONTENT='".$arFields["CONTENT"]."' ";}if(!empty($arFields["REWARD"])){$strSql .= " ,REWARD='".$arFields["REWARD"]."' ";}$strSql .= " where ID='".$DB->ForSql($questID,11)."' AND CREATED_BY='".$DB->ForSql($userId,11)."' ";$DB->Query($strSql, false, "FILE: ".__FILE__."<br> LINE: ".__LINE__);return $res;}public static function updateAnswer($ID, $arFields){$res = array("OK"=>true, "ANSWER_ID"=>$ID, "ERROR"=>"");global $USER, $APPLICATION, $DB;if (!$USER->IsAuthorized()) {$res["OK"] = false;$res["ERROR"] = "需要登录";return $res;}$userId = $USER->GetID();$fromUser = $userId;$toUser = $userId;$arSqls["SELECT"]=' ID,CREATED_BY,REWARD,QUESTION_ID ';$arSqls["WHERE"]=" ID='".$DB->ForSql($ID,11)."' ";$strSql = "SELECT ".$arSqls["SELECT"]." FROM v_act_answer WHERE ".$arSqls["WHERE"]." ";$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."<br>Line: ".__LINE__);$info = array();$oldRewards = 0.0;if ($dbRes){while ($arr_exp = $dbRes->Fetch()){ $info['CREATED_BY']=$arr_exp['CREATED_BY'];$oldRewards = FloatVal($arr_exp['REWARD']);$quest = static::getQuestion(IntVal($arr_exp["QUESTION_ID"]), false, "ID,CREATED_BY");if (!$quest) {$res["OK"] = false;$res["ERROR"] = '未找到答案对应的问题';return $res;} if($quest['CREATED_BY']!=$userId){$res["OK"] = false;$res["ERROR"] = '您不是问题的创建者';return $res;}$toUser = $info['CREATED_BY'];}}if(empty($info)){$res["OK"] = false;$res["ERROR"] = '没找到该答案';return $res;}$strSql = "UPDATE v_act_answer SET DATE_UPDATE=".$DB->CurrentTimeFunction()."";if(!empty($arFields["CONTENT"])){$strSql .= " ,CONTENT='".$arFields["CONTENT"]."' ";}if(!empty($arFields["REWARD"])){$strSql .= " ,REWARD='".$arFields["REWARD"]."' ";}$strSql .= " where ID='".$DB->ForSql($ID, 11)."' AND CREATED_BY='".$DB->ForSql($userId,11)."' ";$DB->Query($strSql, false, "FILE: ".__FILE__."<br> LINE: ".__LINE__);if (abs($oldRewards-FloatVal($arFields["REWARD"])) > 0.01) {static::addNotify("answer", $fromUser, $toUser, "对一个回答进行了赞赏，金额为：￥".StrVal($arFields["REWARD"]));}return $res;}
}

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菜鸟教你如何用php写后台API

1. 首先，要设置一个入口文件

2. 其次，在引入的组件的component.php中获取参数，确定模板的使用

3. 然后，再具体的模板中运用类的方法根据参数获取相应的数据，并返回客户端结果

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