class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
more info about the class
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$handle->jpeg_quality = 100;
Should I email you before and after photos?
$handle->image_ratio_y = true;
$handle->image_x = 1200;
$handle->file_new_name_body = $file_name;
$handle->file_overwrite = true;
$handle->file_auto_rename = false;
$handle->file_max_size = '2000000'; // 2mb
$handle->jpeg_quality = 100;