blank page when trying to change upload directory - php

Question

Working with wordpress 4.2.2, when I use this code in child theme function.php to change the attachments upload directory according to each post type :
function wpse_16722_type_upload_dir( $args ) {
// Get the current post_id
$id = ( isset( $_REQUEST['post_id'] ) ? $_REQUEST['post_id'] : '' );
if( $id ) {
// Set the new path depends on current post_type
$newdir = '/' . get_post_type( $id );
$args['path'] = str_replace( $args['subdir'], '', $args['path'] ); //remove default subdir
$args['url'] = str_replace( $args['subdir'], '', $args['url'] );
$args['subdir'] = $newdir;
$args['path'] .= $newdir;
$args['url'] .= $newdir;
return $args;
}
}
add_filter( 'upload_dir', 'wpse_16722_type_upload_dir' );
I get a blank page!!
there is no empty rows in the function.php and the problem appears only after adding this code. I really need it to organize my upload folder, but without a blank page.
is there any solution?

Answer 1

As pointed out above, you need to see the error reporting. Add to the top of wp-config.php:
php error_reporting(E_ALL); ini_set('display_errors', 1);
If that's not working, find define('WP_DEBUG', false); and set the value to true
This might also help, add to the top of wp-config to pipe errors to err.log at your document root:
#ini_set( 'log_errors', 'On' );
#ini_set( 'display_errors', 'Off' );
#ini_set( 'error_log', $_SERVER['DOCUMENT_ROOT'] . '/err.log' );