I currently have a script which will pull in image contents from a database and, using createimagefromstring(), returns a resized (resampled) image for display:
$max_width = 170;
// Get the image
@mysql_connect('host', 'user', 'pass');
@mysql_select_db('db');
$query = "SELECT `thumbnail_contents`, `thumbnail_mimetype` FROM `videos` WHERE video_number = '$video_number'";
$result = mysql_query($query) or die(mysql_error());
$row = mysql_fetch_object($result);
// Resize if pic bigger than $max_width
// Set the header
header('Content-type:' . $row->thumbnail_mimetype);
// Get original size of image
$image = imagecreatefromstring($row->thumbnail_contents);
$current_width = imagesx($image);
$current_height = imagesy($image);
// Set thumbnail width
$widths = array($current_width, $max_width);
$new_width = min($widths);
// Calculate thumbnail height from given width to maintain ratio
$new_height = $current_height / $current_width*$new_width;
// Create new image using thumbnail sizes
$thumb = imagecreatetruecolor($new_width,$new_height);
// Copy original image to thumbnail
imagecopyresampled($thumb,$image,0,0,0,0,$new_width,$new_height,imagesx($image),imagesy($image));
// Show thumbnail on screen
$show = imagejpeg($thumb);
// Clean memory
imagedestroy($image);
imagedestroy($thumb);
Currently, this script works for most thumbnails and shows them on-screen as desired. However, when I upload an image with a high width, say over 1000px, it gets stored in the database, but the script doesn’t show the resampled image.
To troubleshoot, I’ve checked the db, as well as print_r’d the output from the query. Everything seems to be kosher… Could someone tell me what might be causing such behavior? Any help or guidance is greatly appreciated!
$5 says php is running out of memory. Check your php error logs.