提交的数据未使用PDO插入数据库中-PHP

Question

我正在尝试使用sql中的pdo在数据库中插入数据。我没有收到任何类型的错误。但是经过多次尝试后，数据仍未显示在数据库中。请帮我。查找是否有任何错误。

<?php $pdo = new PDO('mysql:host=localhost;dbname=fizday', 'root', '');?>

<?php
class Main {
//fetching posts from database
public
function posts() {
    global $pdo;
    $query = $pdo->prepare( "SELECT * FROM `posts`,`tbl_users` WHERE userID = user_id_p ORDER BY `post_id` DESC" );
    $query->execute();
    return $query->fetchAll();
}
//add new post if user post
public
function add_post( $user_id, $status ) {
    global $pdo;
    $query = $pdo->prepare( 'INSERT INTO posts (post_id, user_id_p, status, status_time) VALUES (NULL, ?, ?, CURRENT_TIMESTAMP)' );
    $query->bindValue( 1, $user_id );
    $query->bindValue( 2, $status );
    $query->execute();
    header( 'Location: index.php' );
}
//fetch user data by user id
public
function user_data( $user_id ) {
    global $pdo;
    $query = $pdo->prepare( 'SELECT * FROM tbl_users WHERE userID = ?' );
    $query->bindvalue( 1, $user_id );
    $query->execute();
    return $query->fetch();
}
//timeAgo Function
public
function timeAgo( $time_ago ) {

    $time_ago = strtotime( $time_ago );
    $cur_time = time();
    $time_elapsed = $cur_time - $time_ago;
    $seconds = $time_elapsed;
    $minutes = round( $time_elapsed / 60 );
    $hours = round( $time_elapsed / 3600 );
    $days = round( $time_elapsed / 86400 );
    $weeks = round( $time_elapsed / 604800 );
    $months = round( $time_elapsed / 2600640 );
    $years = round( $time_elapsed / 31207680 );
    // Seconds
    if ( $seconds <= 60 ) {
        return "just now";
    }
    //Minutes
    else if ( $minutes <= 60 ) {
        if ( $minutes == 1 ) {
            return "one minute ago";
        } else {
            return "$minutes minutes ago";
        }
    }
    //Hours
    else if ( $hours <= 24 ) {
        if ( $hours == 1 ) {
            return "an hour ago";
        } else {
            return "$hours hrs ago";
        }
    }
    //Days
    else if ( $days <= 7 ) {
        if ( $days == 1 ) {
            return "yesterday";
        } else {
            return "$days days ago";
        }
    }
    //Weeks
    else if ( $weeks <= 4.3 ) {
        if ( $weeks == 1 ) {
            return "a week ago";
        } else {
            return "$weeks weeks ago";
        }
    }
    //Months
    else if ( $months <= 12 ) {
        if ( $months == 1 ) {
            return "a month ago";
        } else {
            return "$months months ago";
        }
    }
    //Years
    else {
        if ( $years == 1 ) {
            return "one year ago";
        } else {
            return "$years years ago";
        }
    }
}
}
?>


<?php
$get = new Main;
$send = new Main;
@$user_id = $_SESSION[ 'userID' ];
//fetching user data by user_id
$data = $get->user_data( $user_id );
// fetching posts from database
$post = $get->posts();
//check user submit  data
if ( isset( $_POST[ 'submit' ] ) ) {
$status = $_POST[ 'status' ];
if ( !empty( $status ) === true ) {
    $send->add_post( $user_id, $status );
}
}
?>

<div class="pt-4">
<div class="row">
    <div class="column1">
        <div class="sidebar">
            <h4>Add Your Story</h4>
            <form action="" method="post" enctype="multipart/form-data">
                <textarea name="status"></textarea>
                <div class="pt-2">
                    <button class="btn btn-gray" type="submit" name="submit">POST</button>
                </div>
            </form>
        </div>
    </div>
    <div class="column2">

        <?php foreach($post as $row){   $time_ago = $row['status_time']; ?>
        <div class="card">
            <div class="user-header">
                <div class="user-pic">
                    <img src="images/user/default.png" class="user-picture" alt="matthewelsom's profile picture">
                </div>
                <div class="user-details">
                    <a href="#" class="user-name">
                        <?php echo $row['userName']?>
                    </a>

                    <div class="user-time">
                        <?php echo $get->timeAgo($time_ago) ?>
                    </div>
                </div>
            </div>
            <div class="user-story">
                <span class="more">
                    <?php echo $row['status'] ?>
                </span>

            </div>
        </div>
        <?php } ?>

    </div>
  </div>
</div>

请帮助我克服这一点，因此我可以将我的数据插入数据库，也可以使用pdo从数据库中检索它。