关于write_board并在DB中保存member_idx

Question

我正在尝试制作书写板，并且当作者完成保存时需要在DB中保存ID值。 但我的数据库只显示'0'member_idx，它看起来我的id会话maintating现在正在工作。 我附上了我的相关代码，但如果您需要更多我错过的代码，请告诉我。

_这是我在apache2的htdocs下的work_tree enter image description here

这是login_check.php

<?php
session_start();
include_once ('../config.php');
$mysqli = new mysqli($DB['host'], $DB['id'], $DB['pw'], $DB['db']);
if (mysqli_connect_error()) {
    exit('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
}

extract($_POST);

$q = "SELECT * FROM ap_member WHERE id='$user_id'";

$result = $mysqli->query($q);

if($result->num_rows==1) {
    $encrypted_pass = sha1($user_pass);
    $row = $result->fetch_array(MYSQLI_ASSOC);
    if( $row['pw'] == $encrypted_pass ) {
        $_SESSION['member_idx'] = $row['member_idx'];
        header('Location: '.$url['root'].'login_done.php');
    }
    else {
        echo 'wrong password';
    }
}
else {
    echo 'ID does not exist or invalid approach. Try again.';
}

if( $row['pw'] == $encrypted_pass ) {
        $_SESSION['is_logged'] = 'YES';
        $_SESSION['user_id'] = $user_id;
        $_SESSION['member_idx'] = $row['member_idx'];
        header('Location: '.$url['root'].'login_done.php');
        exit();
    }
    else {
        $_SESSION['is_logged'] = 'NO';
        $_SESSION['user_id'] = '';
        header('Location: '.$url['root'].'login_done.php');
        exit();
    }

?>

_这是write.php

<?php
require_once $_SERVER['DOCUMENT_ROOT'].'/preset.php';
include $_SERVER['DOCUMENT_ROOT'].'/header.php';
?>

Write a Commment for anything please <br />
<form name ="write_form" method = "POST" action = "./write_check.php">
<input type="hidden" name="member_idx" value="<?php echo $_SESSION['member_idx'] ?>">
<table>
    <tr>
        <td>
    Title
    </td>
    <td>
            <input type ="text" name = "subject" size ="90">
    </td>
    </tr>
    <tr>
        <td>
            Content
    </td>
    <td>
            <textarea name="content" cols="100" rows="10"></textarea>
    </td>
    </tr>
</table>

<div>
    <input type = "submit" value = "저장">
</div>


</form>

<?php
    include $_SERVER['DOCUMENT_ROOT'].'/footer.php';
?>

_最后这是我的DB现在的样子

_ +这是我的ap_bbs

<?php
require_once $_SERVER['DOCUMENT_ROOT'].'/preset.php';
?>

<?php

$reg_date = time();
$member_idx = $_SESSION['member_idx'];

$q = "INSERT INTO ap_bbs (member_idx, subject,content,reg_date) VALUES('$member_idx', '$subject', '$content', '$reg_date')";

$result = $mysqli->query($q);

if ($result==false) {
    $_SESSION['writing_status'] = 'NO';
}
else {
    $_SESSION['writing_status'] = 'YES';
}

$mysqli->close();

header('Location: '.$url['root'].'bbs/write_done.php');
exit();

?>