Android programmers learn PHP development (26)-Simple message board-PhpStorm

Okay, we are finally going to involve data storage. Please forgive me for skipping a lot of basic knowledge. I really can’t wait for the actual practice~~Haha!

Simple message board, relying on txt to store data, just an exercise. In the next article, we will have a first experience with the database. This blog post is just a warm-up.

Look at the effect and source code:

##

<?php
    /**
     * 简单留言板
     */
    $filename = "message.txt";

    // 写入
    // 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;])){
        $mess = "{$_POST[&#39;username&#39;]}||".time()."||{$_POST[&#39;title&#39;]}||{$_POST[&#39;content&#39;]}[n]";
        writeMessage($filename,$mess);
    }

    function writeMessage($filename,$mess){
        $fp = fopen($filename,"a");
        fwrite($fp,$mess);
        fclose($fp);
    }

    // 读取
    if (file_exists($filename)){ // 如果文件存在
        readMessage($filename);
    }

    function readMessage($filename){
        $mess = file_get_contents($filename); // file_get_contents() 把整个文件读入一个字符串中
        $mess = rtrim($mess,"[n]"); // rtrim() 函数移除字符串右侧的空白字符或其他预定义字符
        $arrmess = explode("[n]",$mess); // explode() 函数把字符串打散为数组
        foreach ($arrmess as $m){
            list($username,$date,$title,$content) = explode("||",$m); // list() 函数用于在一次操作中给一组变量赋值
            echo "<b>{$username}</b>    ".date("Y-m-d H:i")."    {$title}，{$content}<br><hr><br>";
        }
    }
?>
<!--简单留言板-->
<!--textarea 多行文本-->
<!--cols="40" 40列-->
<!--rows="4" 4行-->
<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 cols="40" rows="4" name="content"></textarea><br>
    <input type="submit" name="dosubmit" value="留言" /><br>
</form>

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