PHP 排序

1. 先在資料庫 dywphp 的 tblphp 資料表新增兩筆紀錄。

   [root@kvm3 ~]# mycli -S /var/lib/mysql/mysql.sock -uroot -p123qwe 
   mariadb 10.3.11-MariaDB
   mycli 1.20.1
   Chat: https://gitter.im/dbcli/mycli
   Mail: https://groups.google.com/forum/#!forum/mycli-users
   Home: http://mycli.net
   Thanks to the contributor - jbruno
   mariadb root@localhost:(none)> use dywphp;                                      
   You are now connected to database "dywphp" as user "root"
   Time: 0.001s
   mariadb root@localhost:dywphp> insert into tblphp (title,author,submission_date)
                                   values("c++","dywang","2020-01-11");            
   Query OK, 1 row affected
   Time: 0.010s
   mariadb root@localhost:dywphp> insert into tblphp (title,author,submission_date)
                                   values("c++","peter","2020-01-12");             
   Query OK, 1 row affected
   Time: 0.003s
   mariadb root@localhost:dywphp> quit;                                            
   Goodbye!
   

2. 撰寫 sorting.php，查詢變數 $sql 加入 ORDER BY author DESC 條件。

   [root@kvm3 ~]# vim /var/www/html/sorting.php 
   [root@kvm3 ~]# cat /var/www/html/sorting.php 
   <?php
   $dbhost = 'localhost:3306';
   $dbuser = 'root';
   $dbpass = '123qwe';
   $conn = mysqli_connect($dbhost, $dbuser, $dbpass) 
   	or die(mysqli_connect_error().PHP_EOL);
   mysqli_select_db( $conn, 'dywphp' )
   	or die('Error: '.mysqli_error($conn).PHP_EOL);
   $sql = "select id, title, author,submission_date from tblphp order by author desc";
   $retval = mysqli_query( $conn, $sql )
   	or die('Error: '.mysqli_error($conn).PHP_EOL);
   while($row = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {
       echo "Dywphp ID :{$row['id']}  <br> ".
            "Title: {$row['title']} <br> ".
            "Author: {$row['author']} <br> ".
            "Submission Date : {$row['submission_date']} <br> ".
            "--------------------------------<br>";
   }
   mysqli_free_result($retval);
   echo "Fetched data successfully\n";
   mysqli_close($conn); 
   ?>
   

3. curl 連上網址 http://kvm3.deyu.wang/sorting.php，管線處理將 html 換行標籤 <br> 改成 shell 的換行符號 \n，網頁上以 author 降序列出資料表 tblphp 所有紀錄。

   [root@kvm3 html]# curl -s http://kvm3/sorting.php | sed 's/<br> */\n/g'
   
   Dywphp ID :4  
   Title: c++ 
   Author: peter 
   Submission Date : 2020-01-12 
   --------------------------------
   Dywphp ID :2  
   Title: python 
   Author: dywang 
   Submission Date : 2020-01-29 
   --------------------------------
   Dywphp ID :3  
   Title: c++ 
   Author: dywang 
   Submission Date : 2020-01-11 
   --------------------------------
   Fetched data successfully