Correctly trim characters via str_replace?

Question

PHP

there is a function that displays profile images, etc., there are symbols in the database in the form
%w , how can I insert the replacement of %w with 200 (size path) into this function

function Wo_GetMedia($media) {
    global $wo;


    if (empty($media)) {
        return '';
    }
    if ($wo['config']['amazone_s3'] == 1) {
        if (empty($wo['config']['amazone_s3_key']) || empty($wo['config']['amazone_s3_s_key']) || empty($wo['config']['region']) || empty($wo['config']['bucket_name'])) {
            return $wo['config']['site_url'] . '/' . $media;
        }
        return $wo['config']['s3_site_url'] . '/' . $media;
    }
    return  $wo['config']['site_url'] . '/' . $media;
}