Include a PHP filename after extracting the id from Database - php

Question

So when I add a product, an id is assigned and a file is created with the product id, eg 1000.php. I don't know how to call it in the product.php file to be included:
I know what I did in the code pasted below is wrong but I don't know how to make it call the 1000.php file by extracting the id from sql first and then include it in the same file. Any advice?
<?php
function between($start, $end, $string) {
$string = ' ' . $string;
$ini = strpos($string, $start);
if ($ini == 0) return '';
$ini += strlen($start);
$len = strpos($string, $end, $ini) - $ini;
return substr($string, $ini, $len);
}
$pid = $_GET['id'];
$pid = trim($pid);
include('php/config.php');
$sql = "SELECT * FROM products WHERE pid='".$pid."'";
$result = $config->query($sql);
$num_row = mysqli_num_rows($result);
if($num_row == 1 ) {
$row = mysqli_fetch_array($result);
extract($row);
$display = 1; } else { $display = 0; }
include('".$pid.".php');

Answer 1

If I'm understanding well what you are asking help for, before this line:
include('".$pid.".php');
you should create the file and write in it all the data you need in it; something like this could work:
<?php
function between($start, $end, $string) {
$string = ' ' . $string;
$ini = strpos($string, $start);
if ($ini == 0) return '';
$ini += strlen($start);
$len = strpos($string, $end, $ini) - $ini;
return substr($string, $ini, $len);
}
$pid = $_GET['id'];
$pid = trim($pid);
include('php/config.php');
$sql = "SELECT * FROM products WHERE pid='".$pid."'";
$result = $config->query($sql);
$num_row = mysqli_num_rows($result);
if($num_row == 1 ) {
$row = mysqli_fetch_array($result);
extract($row);
$display = 1; } else { $display = 0; }
try {
$handle = fopen($dir.$filename, 'x');//look at https://www.php.net/manual/en/function.fopen.php on why to use 'x'
fwrite($fp, $allTheDataYouWantToWrite);
fclose($handle);
}catch(\Exception $e){
//do something if exception happens
}
After that you have the file created in that directory and its ready for using it
Take in account that include is used to read php code and maybe is not that what you want...