wp_mkdir_p() returning false for is_dir( dirname( $target ) )

[Haro G]

this condition should return true.

When calling wp_upload_dir() it returns an error if the dir already exists.

[duck_]

is_dir( dirname( $target ) ) returns false because the function was unable to create the $target directory even though the parent directory already exists. This is the correct behaviour.

True is returned when the $target already exists and is a directory:

if ( file_exists( $target ) )
    return @is_dir( $target );

Closing as invalid. Please re-open if I misunderstood.