php resize image on upload

Question

I got a form where the user is inserting some data and also uploading an image.

To deal with the image, I got the following code:

define("MAX_SIZE", "10000");
$errors = 0;
$image = $_FILES["fileField"]["name"];
$uploadedfile = $_FILES['fileField']['tmp_name'];
if($image){
    $filename = stripslashes($_FILES['fileField']['name']);
    $extension = strtolower(getExtension($filename));
    if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png") && ($extension != "gif")){
        echo ' Unknown Image extension ';
        $errors = 1;
    } else {
        $newname = "$product_cn.$extension";
        $size = filesize($_FILES['fileField']['tmp_name']);
        if ($size > MAX_SIZE*1024){
            echo "You have exceeded the size limit";
            $errors = 1;
        }
        if($extension == "jpg" || $extension == "jpeg" ){
            $uploadedfile = $_FILES['file']['tmp_name'];
            $src = imagecreatefromjpeg($uploadedfile);
        } else if($extension == "png"){
            $uploadedfile = $_FILES['file']['tmp_name'];
            $src = imagecreatefrompng($uploadedfile);
        } else {
            $src = imagecreatefromgif($uploadedfile);
        }
        list($width, $height) = getimagesize($uploadedfile);
        $newwidth = 60;
        $newheight = ($height/$width)*$newwidth;
        $tmp = imagecreatetruecolor($newwidth, $newheight);
        $newwidth1 = 25;
        $newheight1 = ($height/$width)*$newwidth1;
        $tmp1 = imagecreatetruecolor($newwidth1, $newheight1);
        imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
        imagecopyresampled($tmp1, $src, 0, 0, 0, 0, $newwidth1, $newheight1, $width, $height);
        $filename = "../products_images/$newname";
        $filename1 = "../products_images/thumbs/$newname";
        imagejpeg($tmp, $filename, 100); // file name also indicates the folder where to save it to
        imagejpeg($tmp1, $filename1, 100);
        imagedestroy($src);
        imagedestroy($tmp);
        imagedestroy($tmp1);
    }
}

getExtension function:

function getExtension($str) {
    $i = strrpos($str, ".");
    if (!$i) { return ""; }
    $l = strlen($str) - $i;
    $ext = substr($str,$i+1,$l);
    return $ext;
}

I've wrote some notation in the code since I'm not really familiar with those functions.

For some reason, it doesn't work. When I'm going to the folder "product_images" or "product_images/thumbs", I can't find any image uploaded.

Any idea what's wrong with my code? There should be 60px width image, and 25px width image.

Note: Variables that you don't know where they were declared such as $product_cn were declared before that block of code which works prefectly fine (tested). If you still want a glance at it, feel free to ask for the code.

Thanks in advance!

Answer 1

Here is another nice and easy solution:

$maxDim = 800;
$file_name = $_FILES['myFile']['tmp_name'];
list($width, $height, $type, $attr) = getimagesize( $file_name );
if ( $width > $maxDim || $height > $maxDim ) {
    $target_filename = $file_name;
    $ratio = $width/$height;
    if( $ratio > 1) {
        $new_width = $maxDim;
        $new_height = $maxDim/$ratio;
    } else {
        $new_width = $maxDim*$ratio;
        $new_height = $maxDim;
    }
    $src = imagecreatefromstring( file_get_contents( $file_name ) );
    $dst = imagecreatetruecolor( $new_width, $new_height );
    imagecopyresampled( $dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
    imagedestroy( $src );
    imagepng( $dst, $target_filename ); // adjust format as needed
    imagedestroy( $dst );
}

Reference: PHP resize image proportionally with max width or weight

Edit: Cleaned up and simplified the code a bit. Thanks @jan-mirus for your comment.