Return False Blocking Multiple Messages

On my upload function I have a if in_array in my multiple upload. And sets multiple error messages.

My problem now if I put return FALSE; It will stop the multiple messages from showing and only set one message.

How can I solve this? Any ideas with examples thank you.

PHP Code:

public function upload($field = 'userfile') {

    $allowed_extension = explode('|', $this->allowed_types);

    if (empty($this->upload_path)) {
        $this->set_error('upload_path_not_set', 'upload_path_check');
         return FALSE;
    } 

    if (!realpath(FCPATH . $this->upload_path)) {
        $this->set_error('upload_path_in_correct', 'location_check');
        return FALSE;
    } 

    if (!empty($this->files[$field]['name'][0])) {

        foreach ($this->files[$field]['name'] as $key => $value) {

            $this->file_name = $this->files[$field]['name'][$key];

            $get_file_extension = explode('.', $this->files[$field]['name'][$key]);
            $this->get_file_extension_end = strtolower(end($get_file_extension));
                
            $array_1 = array(
                $allowed_extension,
            );

            $array_2 = array(
                $get_file_extension[1],
            );
                
            if (!in_array($array_2, $array_1)) {
                    
                $this->set_error('file_extension_not_allowed', 'extension_check');

                return FALSE;
            }

        }

    }

} 


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