Crop image in wordpress and delete the original image

Question

After the upload of an image in wordpress I would like to make a check if the registered image is larger than the stated limit size, if it is larger I want to delete the original image in the folder upload and keeps only images cropped with thumbnails (media).

I’m using this function on functions.php

add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata )
{
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    $deleted = unlink( $full_image_path );

    return $metadata;
}

Example:

I specified that the maximum image size will be 300x300, when sending a 350x350 image it cuts the image to 300x300 size and excludes the original 350x350 image.

How is it possible to do that?

Answer 1

The PHP has a method called getimagesize() which, as the name says, returns the image size. For example

$filepath = 'https://upload.wikimedia.org/wikipedia/en/c/c2/Peter_Griffin.png';

$size = getimagesize($filepath);

var_dump($size);

returns

array(6) { [0]=> int(247) [1]=> int(359) [2]=> int(3) [3]=> string(24) "width="247" height="359"" ["bits"]=> int(8) ["mime"]=> string(9) "image/png" }

The first two positions of this array represent, respectively, the length and height of your image. With this, just make a comparison before deleting the image. Your code gets

add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata ){
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    $size = getimagesize($full_image_path);

    if(($full_image_path[0] < 300) and ($full_image_path[1] < 300)){
        $deleted = unlink( $full_image_path );
    }

    return $metadata;
}

Answer 2

Apply on file functions.php

add_filter( 'wp_generate_attachment_metadata', 'delete_fullsize_image' );
function delete_fullsize_image( $metadata )
{
    $upload_dir = wp_upload_dir();
    $full_image_path = trailingslashit( $upload_dir['basedir'] ) . $metadata['file'];
    if($metadata['width'] >= '300'){
     $deleted = unlink( $full_image_path );
    }    
    return $metadata;
}

With this function you can reach the width of the image before the upload. In this case the limit value is 300.