Create thumbs upon upload

[kurt.santo]

Having a form where user can upload image files (currently just one) I need to test for a maximum height and width and decrease size if it exceeds the limit. In addtion a thumbnail also needs to be created and both put into separate folders. I found few functions, which can resize an image, but am not sure how to put the whole thing into my file. The relevant code currently is:

// check for img1if (!isset($_FILES['img1']['name']) OR empty($_FILES['img1']['name'])) {		$errors['img1'] = '\'Image 1\' is a required field';$img1 = FALSE;} else {$ext = explode('.',$_FILES['img1']['name']);$ext = $ext[count($ext)-1];if (!in_array($ext, $allowed)) {$errors['img1'] = '\'Image 1\' accepts only jpg and gif';$img1 = FALSE;} else {$img1 = $user_id . '-1.' . $ext;}}if (isset($_FILES['img1'])) { 	// validate the input		global $ext;		if (in_array($ext, $allowed)) {			// move the file over			if(move_uploaded_file($_FILES['img1']['tmp_name'], "{$images}/{$img1}")) {			echo '<p>the file has been uploaded ok</p>';			} else {			echo '<p>the file upload did not work</p>';			}			// add the data			$query = "INSERT INTO imgTest (user_id, img1) VALUES ('$user_id', '$img1')";					$result = mysqli_query ($dbc, $query) or trigger_error("Query: $query\n<br />MySQL Error: " . mysql_error());			if (mysqli_affected_rows($dbc) == 1) { // If it ran ok       			echo "db insertion went ok";			} else { // if it did not run ok				echo '<p>Your data could not be uploaded due to a system error. We apologise for any inconvenience.</p>'; 			}				}  else { // if one of the data tests failed		echo '<p>You forgot to upload required data or there is a problem with the given input. Please amend the highlighted fields.</p>';	}	}} else // Please upload your data message etc

[Synook]

You can output images manipulated with the GD functions to files with image[type]() - e.g.

imagejpeg($image, "file.jpg");

[kurt.santo]

You can output images manipulated with the GD functions to files with image[type]() - e.g.

imagejpeg($image, "file.jpg");

Saw that, but as I do not know beforehand what image type folks upload am not sure in how to approach (have an array of allowed files)...Kurt

[Wander]

get the extension of the uploaded file, then something like:switch(strtolower($ext)){case 'png':$img=imagecreatefrompng($file);break;case 'jpg':case 'jpeg':$img=imagecreatefromjpeg($file);break;case 'gif':$img=imagecreatefromgif($file);break;default:die('imagetype not supported');}and same at the endswitch(strtolower($ext)){case 'png':$img=imageng($img,$newName);break;case 'jpg':case 'jpeg':$img=imagejpeg($img,$newName);break;case 'gif':$img=imagegif($img,$newName);break;}

[kurt.santo]

get the extension of the uploaded file, then something like:switch(strtolower($ext)){case 'png':$img=imagecreatefrompng($file);break;case 'jpg':case 'jpeg':$img=imagecreatefromjpeg($file);break;case 'gif':$img=imagecreatefromgif($file);break;default:die('imagetype not supported');}and same at the endswitch(strtolower($ext)){case 'png':$img=imageng($img,$newName);break;case 'jpg':case 'jpeg':$img=imagejpeg($img,$newName);break;case 'gif':$img=imagegif($img,$newName);break;}

Wander,Thanks for your input. That sounds like what I am after, but where would I put the functions to check for max height/width and resize? Still cannot get my head around in how to apply functions to variables. Maybe there is a complete example code somewhere of sth similar?Kurt

[jeffman]

I don't know how much this will help. I wrote it to crop/resample uploaded images so they would fit a predetermined size; it also saves all images as jpegs. This is really out of context, but maybe it'll spark something. (And as you see, it trusts the original file ext. Oh well!)

	switch ($_FILES["file"]["type"]) {		case 'image/jpeg':		case 'image/pjpeg':			$im = @imagecreatefromjpeg($_FILES["file"]["tmp_name"]);			break;		case 'image/gif':			$im = @imagecreatefromgif($_FILES["file"]["tmp_name"]);			break;		case 'image/png':			$im = @imagecreatefrompng($_FILES["file"]["tmp_name"]);			break;		default:			$message = "Sorry. Wrong file type.";			return 0;			break;	}	 $W = imagesx ($im);	$H = imagesy ($im);	$newW = 200;	$newH = 240;	$dup = imagecreatetruecolor($newW, $newH);	if ($H/$W > 1.2) { # IMAGE IS TOO TALL		$tempH = $W * 1.2;		$TOP  = abs(floor(($H - $tempH)/2));	} else {		$tempW = $H / 1.2;		$LEFT  = abs(floor(($W - $tempW)/2));	}					$result = imagecopyresampled($dup, $im, 0, 0, $LEFT, 0, $newW, $newH, $tempW, $H);	$result = imagejpeg ($dup, $path);

[kurt.santo]

I don't know how much this will help. I wrote it to crop/resample uploaded images so they would fit a predetermined size; it also saves all images as jpegs. This is really out of context, but maybe it'll spark something. (And as you see, it trusts the original file ext. Oh well!)

	switch ($_FILES["file"]["type"]) {		case 'image/jpeg':		case 'image/pjpeg':			$im = @imagecreatefromjpeg($_FILES["file"]["tmp_name"]);			break;		case 'image/gif':			$im = @imagecreatefromgif($_FILES["file"]["tmp_name"]);			break;		case 'image/png':			$im = @imagecreatefrompng($_FILES["file"]["tmp_name"]);			break;		default:			$message = "Sorry. Wrong file type.";			return 0;			break;	}	 $W = imagesx ($im);	$H = imagesy ($im);	$newW = 200;	$newH = 240;	$dup = imagecreatetruecolor($newW, $newH);	if ($H/$W > 1.2) { # IMAGE IS TOO TALL		$tempH = $W * 1.2;		$TOP  = abs(floor(($H - $tempH)/2));	} else {		$tempW = $H / 1.2;		$LEFT  = abs(floor(($W - $tempW)/2));	}					$result = imagecopyresampled($dup, $im, 0, 0, $LEFT, 0, $newW, $newH, $tempW, $H);	$result = imagejpeg ($dup, $path);

Thanks, thats great. Will test and amend it later on to see if I can modify to fullfill my tasks. Cheers,Kurt