Change filename for Wordpress uploads

wp-change-uploads-filename.php

<?php

/**
 * Change filename for uploads
 *
 * @param  string $file
 */
add_filter( 'wp_handle_upload_prefilter', function($file){
    $hash1 = sha1(mt_rand(10000000,99999999));
    $hash2 = substr(md5(rand()), 0, 7);
    $time = time();
    $sanitized_filename = md5( $hash1 . $hash2 . $time );

    $info = pathinfo($file['name']);
    $ext  = empty($info['extension']) ? '' : '.' . $info['extension'];

    $file['name'] = $sanitized_filename . $ext;

    return $file;
}, 999, 1 );