Question

Anyone know a good PHP tutorial on how to upload an image, resize it to set dimension, then store the image path in MySQL?

Answer 1

I use this function to do this, Very simple and easy to use.
First put this function somewhere you can call it.

public function Resize_image($width = 0, $height = 0, $quality = 90, $filename_in = null, $filename_out = null)
{
    $this->Filename = $filename_in;
    $this->Extension = strtolower($this->Get_file_extension($this->Filename));

    $size = getimagesize($this->Filename);
    $ratio = $size[0] / $size[1];
    if ($ratio >= 1){
        $scale = $width / $size[0];
    } else {
        $scale = $height / $size[1];
    }
    // make sure its not smaller to begin with!
    if ($width >= $size[0] && $height >= $size[1]){
        $scale = 1;
    }

    // echo $fileext;
    switch ($this->Extension)
    {
        case "jpg":
            $im_in = imagecreatefromjpeg($this->Filename);
            $im_out = imagecreatetruecolor($size[0] * $scale, $size[1] * $scale);
            imagecopyresampled($im_out, $im_in, 0, 0, 0, 0, $size[0] * $scale, $size[1] * $scale, $size[0], $size[1]);
            imagejpeg($im_out, $filename_out, $quality);
        break;
        case "gif":
            $im_in = imagecreatefromgif($this->Filename);
            $im_out = imagecreatetruecolor($size[0] * $scale, $size[1] * $scale);
            imagecopyresampled($im_out, $im_in, 0, 0, 0, 0, $size[0] * $scale, $size[1] * $scale, $size[0], $size[1]);
            imagegif($im_out, $filename_out, $quality);
        break;
        case "png":
            $im_in = imagecreatefrompng($this->Filename);
            $im_out = imagecreatetruecolor($size[0] * $scale, $size[1] * $scale);
            imagealphablending($im_in, true); // setting alpha blending on
            imagesavealpha($im_in, true); // save alphablending setting (important)
            imagecopyresampled($im_out, $im_in, 0, 0, 0, 0, $size[0] * $scale, $size[1] * $scale, $size[0], $size[1]);
            imagepng($im_out, $filename_out, 9);
        break;
    }
    imagedestroy($im_out);
    imagedestroy($im_in);
}

Now you can use this function like so to resize images and copy it to the required directory.

Resize_image($width, $height, $quality=90, $filename_in, $filename_out)
Example..
Resize_image(150, 150, 90, "Directory".$image, "Directory".$image_without_extension."_thumb.".$image_ext); //makes file_thumb.ext