在PHP中使用Rest API进行分页

Question

我正在尝试从mysql中获取数据并使用分页显示类别。我得到了类别明智的结果但是当我改变我的每个类别的页面数据也改变了我需要更改所选类别的数据。我已经为用户设置了多类别新闻选项，因此他们可以将一个新闻添加到多个类别。帮助我这里是我的代码我在尝试什么。

<?php

include'../config.php';

// number of rows to show per page
$rowsperpage = 2;


$main = array();
$cat = array();


$qry = "SELECT * FROM app_category order by id DESC ";
$res = mysqli_query($con, $qry);
$records = mysqli_fetch_array($res, MYSQLI_ASSOC);
$rowcount = mysqli_num_rows($res);
if ($rowcount > 1) {
    foreach ($res as $records) {

        $cat = $records;
// lets find out how many rows are in the MySQL table
        $sql = "SELECT COUNT(*) FROM app_news WHERE cat_id='" . $cat['id'] . "'";
        $result = mysqli_query($con, $sql) or die(mysql_error());
        $r = mysqli_fetch_row($result);
        $numrows = $r[0];
// find out total pages
        $totalpages = ceil($numrows / $rowsperpage);

        if (isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) {
            $currentpage = (int) $_GET['currentpage'];
        } else {
            $currentpage = 1;  // default page number
        }

        // if current page is greater than total pages
        if ($currentpage > $totalpages) {
// set current page to last page
            $currentpage = $totalpages;
        }
// if current page is less than first page
        if ($currentpage < 1) {
// set current page to first page
            $currentpage = 1;
        }
// the offset of the list, based on current page
        $offset = ($currentpage - 1) * $rowsperpage;


        $qry = "SELECT * FROM app_news where cat_id='" . $cat['id'] . "' LIMIT $offset, $rowsperpage";
        $res1 = mysqli_query($con, $qry);

        $json1 = array();

        while ($records1 = mysqli_fetch_array($res1, MYSQLI_ASSOC)) {
            $news_id = $records1['news_id'];
            $news_title = $records1['title'];
            $news_des = $records1['description'];
            $news_des = htmlspecialchars_decode(str_replace("&quot;", "\"", $news_des));
            $news_image = $records1['image'];

            $json1[] = array("news_id" => $news_id, "title" => $news_title, "image" => $imgapi . $news_image, "description" => $news_des);
        }
        $cat['All-news'] = array("total no of pages" => $totalpages, "data" => $json1);
        $main[] = $cat;
        unset($json1);
        unset($json);
        unset($cat);
    }
    unset($totalpages);
//header("Content-Type: application/json; charset=utf-8");
    echo json_encode($main, JSON_UNESCAPED_SLASHES);
    unset($main);
    mysqli_close($con);
} else {
    $minfo = array("success" => 'false', "message" => 'No result to display. Please add First category.');
    $jsondata = json_encode($minfo);
    print_r($jsondata);
    mysqli_close($conn);
    exit();
}

Answer 1

我在两个请求get和post中拆分我的代码 get是第一次初始化然后我使用post方法从app获取滚动量：

这是代码：

<?php

include'../config.php';
$main = array();
$cat = array();
if ($_SERVER['REQUEST_METHOD'] === 'GET') {


    $rowsperpage = 5;
    $qry = "SELECT * FROM app_category order by id DESC ";
    $res = mysqli_query($con, $qry);
    $records = mysqli_fetch_array($res, MYSQLI_ASSOC);
    $rowcount = mysqli_num_rows($res);
    if ($rowcount > 1) {
        foreach ($res as $records) {

            $cat = $records;
// lets find out how many rows are in the MySQL table
            $sql = "SELECT COUNT(*) FROM app_news WHERE cat_id='" . $cat['id'] . "'";
            $result = mysqli_query($con, $sql) or die(mysql_error());
            $r = mysqli_fetch_row($result);
            $numrows = $r[0];
// find out total pages
            $totalpages = ceil($numrows / $rowsperpage);

            if (isset($_GET['currentpage']) && is_numeric($_GET['currentpage'])) {
                $currentpage = (int) $_GET['currentpage'];
            } else {
                $currentpage = 1;  // default page number
            }

            // if current page is greater than total pages
            if ($currentpage > $totalpages) {
// set current page to last page
                $currentpage = $totalpages;
            }
// if current page is less than first page
            if ($currentpage < 1) {
// set current page to first page
                $currentpage = 1;
            }
// the offset of the list, based on current page
            $offset = ($currentpage - 1) * $rowsperpage;


            $qry = "SELECT * FROM app_news where cat_id='" . $cat['id'] . "' LIMIT $offset, $rowsperpage";
            $res1 = mysqli_query($con, $qry);

            $json1 = array();

            while ($records1 = mysqli_fetch_array($res1, MYSQLI_ASSOC)) {
                $news_id = $records1['news_id'];
                $news_title = $records1['title'];
                $news_des = $records1['description'];
                $news_des = htmlspecialchars_decode(str_replace("&quot;", "\"", $news_des));
                $news_image = $records1['image'];

                $json1[] = array("news_id" => $news_id, "title" => $news_title, "image" => $imgapi . $news_image, "description" => $news_des);
            }
            $cat['All-news'] = array("total no of pages" => $totalpages, "data" => $json1);
            $main[] = $cat;
            unset($json1);
            unset($json);
            unset($cat);
        }
        unset($totalpages);
//header("Content-Type: application/json; charset=utf-8");
        echo json_encode($main, JSON_UNESCAPED_SLASHES);
        unset($main);
        mysqli_close($con);
    } else {
        $minfo = array("success" => 'false', "message" => 'No result to display. Please add First category.');
        $jsondata = json_encode($minfo);
        print_r($jsondata);
        mysqli_close($conn);
        exit();
    }
}




if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    include_once'../config.php';
    if (isset($_POST['cat_id'])) {
        $rowsperpage = 5;
        $catid = $_POST['cat_id'];
        $qry = "SELECT * FROM app_category WHERE id='" . $catid . "' ";
        $res = mysqli_query($con, $qry);
         while ($row = mysqli_fetch_array($res, MYSQLI_ASSOC)) {
            $cat=$row;
        }
// lets find out how many rows are in the MySQL table
            $sql = "SELECT COUNT(*) FROM app_news WHERE cat_id='" . $cat['id'] . "'";
            $result = mysqli_query($con, $sql) or die(mysql_error());
            $r = mysqli_fetch_row($result);
            $numrows = $r[0];
// find out total pages
            $totalpages = ceil($numrows / $rowsperpage);
            ///Checkeing for page requested
            if (isset($_POST['currentpage']) && is_numeric($_POST['currentpage'])) {
                $currentpage = (int) $_POST['currentpage'];
            } else {
                $currentpage = 1;  // default page number
            }
            // if current page is greater than total pages
            if ($currentpage > $totalpages) {
// set current page to last page
                $currentpage = $totalpages;
            }
// if current page is less than first page
            if ($currentpage < 1) {
// set current page to first page
                $currentpage = 1;
            }
// the offset of the list, based on current page
            $offset = ($currentpage - 1) * $rowsperpage;

            $qry = "SELECT * FROM app_news where cat_id='" . $catid . "' LIMIT $offset, $rowsperpage";
            $res1 = mysqli_query($con, $qry);
            $json1 = array();

            while ($records1 = mysqli_fetch_array($res1, MYSQLI_ASSOC)) {
                $news_id = $records1['news_id'];
                $news_title = $records1['title'];
                $news_des = $records1['description'];
                $news_des = htmlspecialchars_decode(str_replace("&quot;", "\"", $news_des));
                $news_image = $records1['image'];

                $json1[] = array("news_id" => $news_id, "title" => $news_title, "image" => $imgapi . $news_image, "description" => $news_des);
            }
            $cat['All-news'] = array("total no of pages" => $totalpages, "data" => $json1);
            $main[] = $cat;
            unset($json1);
            unset($json);
            unset($cat);


        echo json_encode($main, JSON_UNESCAPED_SLASHES);
        unset($main);
        unset($totalpages);
        mysqli_close($con);
    }
}