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PHP ひとこと掲示板

Last updated at Posted at 2020-08-12
<?php

$filename = './bbs.txt';
$date  = date('Y-m-d H:i:s');
$data  = [];
$error = [];
$username = '';
$comment   = '';

if($_SERVER['REQUEST_METHOD'] === 'POST'){
    
    if (isset($_POST['username']) === true) {
        $username = trim($_POST['username']);
    }
    if (isset($_POST['comment']) === true) {
        $comment = trim($_POST['comment']);
    }
    
    if ($username === '') {
        $error[] = '名前を入力してください';
    } else if (mb_strlen($username) > 20 ) {
        $error[] = '名前は20文字以内で発言してください';
    }
    if ($comment === '') {
        $error[] = 'ひとことを入力してください';
    } else if (mb_strlen($comment) > 100) {
        $error[] = 'ひとことは100文字までで発言してください';
    }

    if (count($error) === 0) {
        $log = $username . ":\t" . $comment . "\t-" . $date . "\n";
        if (($fp = fopen($filename, 'a')) !== FALSE) {       
            if (fwrite($fp, $log) === FALSE) {              
                $error[] =  'ファイル書き込み失敗:  ' . $filename;
            }
            fclose($fp);
        }
    }
}


if(is_readable($filename) === true){
    if(($fp = fopen($filename,'r')) !== false){
        while(($tmp = fgets($fp)) !== false){
            $data[] = htmlspecialchars($tmp,ENT_QUOTES,'UTF-8');
        }
    }
} else {
    $error[] = 'ファイルがありません';
}

$data = array_reverse($data);

?>
<!doctype html>
<html lang="ja">
    <head>
        <meta charset="utf-8">
        <title>ひとこと掲示板</title>
    </head>
    <body>
        <h1>ひとこと掲示板</h1>
<?php if (count($error) > 0) { ?>
    <ul>
    <?php foreach($error as $value) { ?>
        <li><?php print $value; ?></li>
    <?php } ?>
    </ul>
<?php } ?>
        <form method="post">
            名前:<input type="text" name="username">
            ひとこと:<input type="text" name="comment">
            <input type="submit" value="送信">
        </form>
        <ul>
<?php foreach ($data as $value) { ?>
            <li><?php print $value; ?></li>
<?php } ?>
        </ul>
    </body>
</html>

countを便利に使う。

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