Error code

Question

I have a code that is actually two fields and after entering the information, a person will create a file in PHP format in which the information entered by the person will be and the information of each person will be stored in a separate backup file. So I created a variable that randomly selects the number But an error occurs. The file created on the host with the variable name $ randomname goes to the name of the created file.
I think the error in this part of my code is:
$response['GETs'] = $GETs;
$randomnumber = rand(0,100000000);
$randomname = "results".$randomnumber.".php";

Answer 1

What error occured?