How to upload and store image in MYSQL using PHP

CREATE TABLE `My_new_blob_gallery` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(64) character SET utf8 NOT NULL,
  `ext` varchar(8) character SET utf8 NOT NULL,
  `image_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE
   CURRENT_TIMESTAMP,
  `data` mediumblob NOT NULL,
  PRIMARY KEY  (`id`)
);

$db_host = 'localhost'; // don't forget to change
$db_user = '';
$db_pwd = '';

$database = 'mydata_base';
$table = 'My_new_blob_gallery';
// use the same name as SQL table

$password = '123';
// simple upload restriction,
// to disallow uploading to everyone
$con=mysqli_connect($db_host, $db_user, $db_pwd,$database);
if (!mysqli_connect($db_host, $db_user, $db_pwd))
    die("Can't connect to database");

if (!mysqli_select_db($con,$database))
    die("Can't select database");

if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
    // cleaning title field
    $title = trim(sql_safe($_POST['title']));

    if ($title == '') // if title is not set
        $title = '(empty title)';// use (empty title) string

    if ($_POST['password'] != $password)  // cheking passwors
        $msg = 'Error: wrong upload password';
    else
    {
        if (isset($_FILES['photo']))
        {
            @list(, , $imtype, ) = getimagesize($_FILES['photo']['tmp_name']);
            // Get image type.
            // We use @ to omit errors
			$file = $_FILES['photo']['tmp_name'];
			$imgsize=$_FILES['photo']['size']/1024;

            if ($imtype == 3) // checking image type
                $ext="png";   // to use it later in HTTP headers
            elseif ($imtype == 2)
                $ext="jpeg";
            elseif ($imtype == 1)
                $ext="gif";
            else
                $msg = 'Error: unknown file format';
			
			$result = mysqli_query($con, "SELECT * FROM $table");
			$result_check= mysqli_num_rows($result);

            if (!isset($msg) && $result_check <=4 && $imgsize < 48) // If there was no error
            {
                $data = file_get_contents($_FILES['photo']['tmp_name']);
                $data = mysqli_real_escape_string($con,$data);
                // Preparing data to be used in MySQL query
                mysqli_query($con,"INSERT INTO {$table}
                                SET ext='$ext', title='$title',
                                    data='$data'");

                $msg = 'Success: image uploaded '.$imgsize.'KB';
            }
			else
			{
				$msg = 'Error: Upload Failed, try again';
			}
        }
        elseif (isset($_GET['title']))      // isset(..title) needed
            $msg = 'Error: file not loaded';// to make sure we've using
                                            // upload form, not form
                                            // for deletion

        if (isset($_POST['del'])) // If used selected some photo to delete
        {                         // in 'uploaded images form';
            $id = intval($_POST['del']);
            mysqli_query($con,"DELETE FROM {$table} WHERE id=$id");
            $msg = 'Photo deleted';
        }
    }
}

if ($imtype == 3) // checking image type
                $ext="png";   // to use it later in HTTP headers
            elseif ($imtype == 2)
                $ext="jpeg";
            elseif ($imtype == 1)
                $ext="gif";
            else
                $msg = 'Error: unknown file format';

elseif (isset($_GET['show']))
{
    $id = intval($_GET['show']);

    $result = mysqli_query($con,"SELECT ext, UNIX_TIMESTAMP(image_time), data
                             FROM {$table}
                            WHERE id=$id LIMIT 1");

    if (mysqli_num_rows($result) == 0)
        die('no image');

    list($ext, $image_time, $data) = mysqli_fetch_row($result);

    $send_304 = false;
    if (php_sapi_name() == 'apache') {
        // if our web server is apache
        // we get check HTTP
        // If-Modified-Since header
        // and do not send image
        // if there is a cached version

        $ar = apache_request_headers();
        if (isset($ar['If-Modified-Since']) && // If-Modified-Since should exists
            ($ar['If-Modified-Since'] != '') && // not empty
            (strtotime($ar['If-Modified-Since']) >= $image_time)) // and grater than
            $send_304 = true;                                     // image_time
    }

    if ($send_304)
    {
        // Sending 304 response to browser
        // "Browser, your cached version of image is OK
        // we're not sending anything new to you"
        header('Last-Modified: '.gmdate('D, d M Y H:i:s', $ts).' GMT', true, 304);

        exit(); // bye-bye
    }

    // outputing Last-Modified header
    header('Last-Modified: '.gmdate('D, d M Y H:i:s', $image_time).' GMT',
            true, 200);

    // Set expiration time +1 year
    // We do not have any photo re-uploading
    // so, browser may cache this photo for quite a long time
    header('Expires: '.gmdate('D, d M Y H:i:s',  $image_time + 86400*365).' GMT',
            true, 200);

    // outputing HTTP headers
    header('Content-Length: '.strlen($data));
    header("Content-type: image/{$ext}");

    // outputing image
    echo $data;
    exit();
}

<html><head>
<title>MySQL Blob Image Gallery Example</title>
</head>
<body>
<?php
if (isset($msg)) // this is special section for
                 // outputing message
{
?>
<p style="font-weight: bold;"><?php echo $msg ?>
<br />
<a href="<?php echo $_SERVER['SCRIPT_NAME'] ?>">reload page</a>
<!-- I've added reloading link, because
     refreshing POST queries is not good idea -->
</p>
<?php
}
?>
<h1>Blob image gallery</h1>
<h2>Uploaded images:</h2>
<form action="<?php echo  $_SERVER['SCRIPT_NAME']?>" method="post">
<!-- This form is used for image deletion -->

<?php
$result = mysqli_query($con,"SELECT id, image_time, title, data FROM {$table} ORDER BY id DESC");
if (mysqli_num_rows($result) == 0) // table is empty
    echo '<ul><li>No images loaded</li>';
else
{
    echo '<ul>';
    while(list($id, $image_time, $title,$data) = mysqli_fetch_row($result))
    {
        // outputing list
        echo "<li><input type='radio' name='del' value='".$id."'/>";
        echo "<a href='https://demo.webtutorials.dev/gallery_mistonline_blob_demo/?show=".$id."'>".$title."</a>";
	echo '<img width="100px" src="data:image/jpeg;base64,'.base64_encode($data).'">';
	echo "<small>{$image_time}</small></li>";
    }

    echo '</ul>';

    echo '<label for="password">Password:</label><br />';
    echo '<input type="password" name="password" id="password"/><br /><br />';

    echo '<input type="submit" value="Delete selected"/>';
}
?>

</form>
<h2>Upload new image:</h2>
<form action="<?php echo $_SERVER['SCRIPT_NAME'];?>" method="POST" enctype="multipart/form-data">
<label for="title">Title:</label><br />
<input type="text" name="title" id="title" size="64"/><br /><br />

<label for="photo">Photo:</label><br />
<input type="file" name="photo" id="photo"/><br /><br />

<label for="password">Password:</label><br />
<input type="password" name="password" id="password"/><br /><br />

<input type="submit" value="upload"/>
</form>
</body>
</html>