Hello! I’m a newbie in php programming. I recently found a tutorial which creates an image gallery. I followed it and somehow managed to get it working. The problem is, when I try to retrieve the images stored in the database, it says that the image cannot be displayed because it contains errors.
[php]
<?php $db_host = 'localhost'; // don't forget to change $db_user = 'root'; $db_pwd = ''; $database = 'mydb'; $table = 'gallery'; // use the same name as SQL table $password = '123'; // simple upload restriction, // to disallow uploading to everyone if (!mysql_connect($db_host, $db_user, $db_pwd)) die("Can't connect to database"); if (!mysql_select_db($database)) die("Can't select database"); // This function makes usage of // $_GET, $_POST, etc... variables // completly safe in SQL queries function sql_safe($s) { if (get_magic_quotes_gpc()) $s = stripslashes($s); return mysql_real_escape_string($s); } // If user pressed submit in one of the forms if ($_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 if ($imtype == 3) // cheking image type $ext="png"; // to use it later in HTTP headers elseif ($imtype == 2) $ext="jpeg"; elseif ($imtype == 1) $ext="gif"; else $msg = 'Error: unknown file format'; if (!isset($msg)) // If there was no error { $data = file_get_contents($_FILES['photo']['tmp_name']); $data = mysql_real_escape_string($data); // Preparing data to be used in MySQL query mysql_query("INSERT INTO {$table} SET ext='$ext', title='$title', data='$data'"); $msg = 'Success: image uploaded'; } } elseif (isset($_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']); mysql_query("DELETE FROM {$table} WHERE id=$id"); $msg = 'Photo deleted'; } } } elseif (isset($_GET['show'])) { $id = intval($_GET['show']); $result = mysql_query("SELECT ext, UNIX_TIMESTAMP(image_time), data FROM {$table} WHERE id=$id LIMIT 1"); if (mysql_num_rows($result) == 0) die('no image'); list($ext, $image_time, $data) = mysql_fetch_row($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/jpeg"); // outputing image echo $data; exit(); } ?> MySQL Blob Image Gallery Example <?php if (isset($msg)) // this is special section for // outputing message { ?><?=$msg?>
reload page
Blob image gallery
Uploaded images:
<?php $result = mysql_query("SELECT id, image_time, title FROM {$table} ORDER BY id DESC"); if (mysql_num_rows($result) == 0) // table is empty echo '- No images loaded
- ';
while(list($id, $image_time, $title) = mysql_fetch_row($result))
{
// outputing list
echo "
- "; echo "{$title} – "; echo "{$image_time} "; } echo '
'; echo '
'; echo ''; } ?>
Upload new image:
Title:Photo:
Password:
[/php]
