Generating different dimension images while uploading image file from custom plugin page

Question

There is a file upload provision in my custom plugin page.

On this, I'm saving the image details into post table as an attachment post type and moving the uploaded file manually. Here is my code:

$wp_upload_dir = wp_upload_dir();
$filetype = $_FILES['img_name'];
$filename = $filetype['name'];
$attachment = array(
    'guid'           => $wp_upload_dir['url'] . '/' . basename( $filename ), 
    'post_mime_type' => $filetype['type'],
    'post_title'     => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
    'post_content'   => '',
    'post_status'    => 'inherit'
);
$attach_id = wp_insert_attachment($attachment, $filename);
move_uploaded_file($_FILES['test_upload_pdf']['tmp_name'],$wp_upload_dir['path'].'/'.$_FILES['test_upload_pdf']['name']);

Is there any alternative way for move_uploaded_file() in WordPress to get the different dimension of the given image automatically?

Answer 1

Resized different dimension image sets are generated by using wp_generate_attachment_metadata and wp_update_attachment_metadata method.

$absFilename = $wp_upload_dir['path'].'/'.$filename;
$attach_data = wp_generate_attachment_metadata( $attach_id, $absFilename);
wp_update_attachment_metadata( $attach_id, $attach_data );

This will update the image details in the wp_postmeta table.

Thanks @DaveRomsey