Resize an image and save with imagejpeg() - php

Question

iam trying to resize an imageto a thumbnail with php! I get no errors but it won't save the thumbnail on my server. The code is:
#Resize image
function resize($input_dir, $cur_file, $newwidth, $output_dir)
{
$filename = $input_dir.'/'.$cur_file;
$format='';
if(preg_match("/.jpg/i", $filename))
{
$format = 'image/jpeg';
}
if (preg_match("/.gif/i", $filename))
{
$format = 'image/gif';
}
if(preg_match("/.png/i", $filename))
{
$format = 'image/png';
}
if($format!='')
{
list($width, $height) = getimagesize($filename);
$newheight=$height*$newwidth/$width;
switch($format)
{
case 'image/jpeg':
$source = imagecreatefromjpeg($filename);
break;
case 'image/gif';
$source = imagecreatefromgif($filename);
break;
case 'image/png':
$source = imagecreatefrompng($filename);
break;
}
$thumb = imagecreatetruecolor($newwidth,$newheight);
imagealphablending($thumb, false);
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagejpeg($thumb, 'thumb_'.$cur_file);
}
}
My function looks like:
resize(plugins_url().'/MyImagePlugin/img', 'testimg.jpg', "200");
The Image is in the Folder "img" in my Plugin Dic. The wired thing is ,that i don't get any erros?! CHMOD is 777 for img-folder.
Any help would be appreciated.

Answer 1

You are not using any path when you save the image in the line:
imagejpeg($thumb, 'thumb_'.$cur_file);
$cur_file is set to testing.jpg.
You should add the path to the filename or it will be attempoting to create it in whatever the current directory is.
Changes are something like :
function resize($input_dir, $cur_file, $newwidth, $output_dir = "" )
{
if($output_dir == "") $output_dir = $input_dir;
.....
imagejpeg($thumb, $output_dir.'/thumb_'.$cur_file);
}
}

Answer 2

I know that this is not your way of doing but iam sure it can help you.
if (isset($_FILES['image']['name']))
{
$saveto = "dirname/file.jpg";
move_uploaded_file($_FILES['image']['tmp_name'], $saveto);
$typeok = TRUE;
switch($_FILES['image']['type'])
{
case "image/gif": $src = imagecreatefromgif($saveto); break;
case "image/jpeg": // Both regular and progressive jpegs
case "image/pjpeg": $src = imagecreatefromjpeg($saveto); break;
case "image/png": $src = imagecreatefrompng($saveto); break;
default: $typeok = FALSE; break;
}
if ($typeok)
{
list($w, $h) = getimagesize($saveto);
$max = 500;
\\ you can change this to desired product for height and width.
$tw = $w;
$th = $h;
if ($w > $h && $max < $w)
{
$th = $max / $w * $h;
$tw = $max;
}
elseif ($h > $w && $max < $h)
{
$tw = $max / $h * $w;
$th = $max;
}
elseif ($max < $w)
{
$tw = $th = $max;
}
$tmp = imagecreatetruecolor($tw, $th);
imagecopyresampled($tmp, $src, 0, 0, 0, 0, $tw, $th, $w, $h);
imageconvolution($tmp, array( // Sharpen image
array(-1, -1, -1),
array(-1, 16, -1),
array(-1, -1, -1)
), 8, 0);
imagejpeg($tmp, $saveto);
imagedestroy($tmp);
imagedestroy($src);
}
}