TCPDF Action

i am using tcpdf action in chronoforms, i need to pre-process data using PHP, i tried using php action

for accessing field value tried this : $this->data("field_name", "default value");
for accessing function/Actions data tried this : $this->get("var_name", "default");

both of these are not working

print_r( $this->data("client_information_us_mail", "default value") );
print_r( $this->get("save_data5", "default") );

these are not working form me

please check once and let me know

try to return the value then use it in TCPDF:

{var:php_name}

i have already tried this, it’s not working for me.