How to hold a process and echo a popup

i have a script to send an email with attachments but i have a trouble, my script defaultly send 5 attachments and i add the "6th" attachment with this code :

$attachments[]=WP_CONTENT_DIR."/uploads/text_img/".$itemID['order_item_id'].".png";

as you guys see the "6th" attachment is :

".$itemID['order_item_id'].".png";

the "6th" attachment created by opening a script named image080515.php i open that script with a popup like this :

 $loc ='http://118.96.90.225/rumahcustom/wp-content/image080515.php';

echo "window.open('$loc', '_blank'); window.focus();";

and the popup is late, the email already sent right before the image has created.
this is the email & attachments code :

function trigger( $order_id ) {
    global $wpdb;
    if ( $order_id ) {
        $this->object       = wc_get_order( $order_id );

        $this->find['order-date']      = '{order_date}';
        $this->find['order-number']    = '{order_number}';

        $this->replace['order-date']   = date_i18n( wc_date_format(), strtotime( $this->object->order_date ) );
        $this->replace['order-number'] = $this->object->get_order_number();
    }

    if ( ! $this->is_enabled() || ! $this->get_recipient() ) {
        return;
    }

    $attachments=array();
    $getItemID = $wpdb->get_results("SELECT * FROM `wp_woocommerce_order_items` where order_id='".$order_id."' and order_item_type='line_item'",ARRAY_A);
    foreach ( $getItemID as $itemID ) {
        $getImage = $wpdb->get_results("SELECT * FROM `wp_woocommerce_order_itemmeta` where order_item_id='".$itemID['order_item_id']."' and meta_key='fpd_data'",ARRAY_A);
        foreach ( $getImage as $imageID ) {
            $unser = unserialize($imageID['meta_value']);
            $asd=json_decode($unser['fpd_product'],true);
            foreach($asd as $dsa){
                foreach($dsa['elements'] as $gfd){
                    $pathImage=str_replace('http://118.96.90.225/rumahcustom/wp-content','',$gfd['source']);
                    $attachments[]= WP_CONTENT_DIR.$pathImage;
                }
            }
        }
        $attachments[]=WP_CONTENT_DIR."/uploads/text_img/".$itemID['order_item_id'].".png";         
    }
    $this->send( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $attachments);
}

i wonder can i hold this:

$this->send( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $attachments);

with something like while or any looping function

all i want is : before this code runs :

$loc ='http://118.96.90.225/rumahcustom/wp-content/image080515.php';

echo "window.open('$loc', '_blank'); window.focus();";

this code will hold (or stop maybe ?)

$this->send( $this->get_recipient(), $this->get_subject(), $this->get_content(), $this->get_headers(), $attachments);

Please help and sorry for my bad english