Question

everything in my code is working great for creating a thumbnail image of an uploaded picture.

now all i need to do is crop the $thumb from the center of the image into a square shape (50×50)

heres my function so far

    $ext = end(explode('.', $_FILES['profile_photo']['name']));

    if ($ext == 'jpg' || $ext == 'jpeg' || $ext == 'png' || $ext == 'gif')
    {
        $tmp = $_FILES['profile_photo']['tmp_name'];

        if ($ext=='jpg' || $ext=='jpeg')
            $src = imagecreatefromjpeg($tmp);
        else if ($ext=='png')
            $src = imagecreatefrompng($tmp);
        else 
            $src = imagecreatefromgif($tmp);

        list($width,$height) = getimagesize($tmp);

        $thumb_width = 50;
        $thumb_height = ($height/$width) * $thumb_width;
        $thumb_tmp = imagecreatetruecolor($thumb_width, $thumb_height);

        $full_width = 200;
        $full_height = ($height/$width) * $full_width;
        $full_tmp = imagecreatetruecolor($full_width, $full_height);

        imagecopyresampled($thumb_tmp, $src, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height);         
        imagecopyresampled($full_tmp, $src, 0, 0, 0, 0, $full_width, $full_height, $width, $height);        

        imagejpeg($thumb_tmp, 'images/profile/'.$user['id'].'_'.time().'_thumb.'.$ext, 100);
        imagejpeg($full_tmp, 'images/profile/'.$user['id'].'_'.time().'_full.'.$ext, 100);

        imagedestroy($src);
        imagedestroy($thumb_tmp);
        imagedestroy($full_tmp);

        // delete old image from server if it is not none.png
    }

any help would be greatly appreciated! i know that it has something to do with imagecopyresampled but i can’t figure out the math for the cropping from the center of the image. i want this to be my own function so please dont recommend me using other peoples classes.

Answer 1

Right after $full_tmp = imagecreatetruecolor($full_width, $full_height);, add…

if ($thumb_width > $thumb_height) {
    $thumb_offset = array('x' => ($thumb_width/2 - 25), 'y' => 0);
} else {
    $thumb_offset = array('x' => 0, 'y' => ($thumb_height/2 - 25));
}

$square_tmp = imagecreatetruecolor($thumb_width, $thumb_height);

imagecopyresampled($square_tmp, $src, 0, 0, $thumb_offset['x'], $thumb_offset['y'], 50, 50, $width, $height);

Then save and destroy the temp like the other two images.