The idea and design of web message board developed in PHP

The example of this article shares the implementation ideas of php message board for your reference. The specific content is as follows:
1. Create a file name to store message information
2. Get the data in the form and give it to a variable
3. Determine the existence of the file
4. Perform the write operation on the file. Before doing this, pay attention to selecting the access method to the file when opening the file. Finally, remember to close the file
5. Write the file To perform the read operation, remember to close the file at the end.

The implementation code is as follows:

<?php
     
    //留言板的思路：1.先创建一个文件名，方便于存放写入的内容
    // 2.将表单中的内容赋值给一个变量
    //3.判断文件是否存在，将用户输入的值写进变量，打开文件的是时候注意选择对文件访问的操作
    //4.读取文件的内容,关闭文件
  
    header("Content-Type:text/html;charset=utf8");
    $filename = "message.txt";//创建一个文件的名字
     
    //如果用户提交了， 就写入文件， 按一定格式写入
    if(isset($_POST[&#39;dosubmit&#39;])) {
    //字段的分隔使用||, 行的分隔使用[n]
    $mess = "{$_POST[&#39;username&#39;]}||".time()."||{$_POST[&#39;title&#39;]}||{$_POST[&#39;content&#39;]}[n]";

    writemessage($filename, $mess);//向文件写进内容
     
    }
     
    if(file_exists($filename)) {//判断文件 是否存在
    readmessage($filename);//读取文件的函数
    }
     
     
    function writemessage($filename, $mess) {
    $fp = fopen($filename, "a");//在尾部执行写的操作，且不删除原来的文件内容
    fwrite($fp, $mess);//写入文件
     
    fclose($fp);//关闭文件
    }
     
    function readmessage($filename) {
    $mess = file_get_contents($filename);
    $mess = rtrim($mess, "[n]");
     
    $arrmess = explode("[n]", $mess);
     
    foreach($arrmess as $m) {
    list($username, $dt ,$title, $content) = explode("||", $m);
     
    echo "{$username}, ".date("Y-m-d H:i").": <i>{$title}</i>, <u>{$content}</u><br><hr><br>";
    }
     
    }
     
    ?>
     
    <form action="message.php" method="post">
    用户: <input type="text" name="username" value="" /><br>
    标题：<input type="text" name="title" value="" /><br>
    内容：<textarea name="content" cols="40" rows="4"></textarea><br>
    <input type="submit" name="dosubmit" value="留言" /><br>
    </form>

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