Why is the file not being created with CURLOPT_COOKIEJAR?

Question

PHP

index.php:

<?php

$ch=curl_init("http://home.local/curlTest/cookieTest.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_COOKIE, 'curl_normal_cookie=1; curl_session_cookie=1');
curl_setopt($ch, CURLOPT_COOKIEJAR, "file.txt");
$html=curl_exec($ch);
curl_close($ch);
echo $html;

cookieTest.php:

<?php
$cook=false;
if(isset($_COOKIE['curl_session_cookie']))
{
  $cook=true;
  echo "Сессионная кука есть\r\n";
}
if(isset($_COOKIE['curl_normal_cookie']))
{
  $cook=true;
  echo "Нормальная кука есть\r\n";
}

@setcookie('curl_session_cookie', 1);
@setcookie('curl_normal_cookie', 1);

if($cook)
{
  echo "Есть куки";
}
else echo "Нет куки";

file.txt in the project folder is not created.

Answer 1

Immediately there can be 2 options:
1) the rights to write are not set on the current folder;
and
2) the current folder for saving cookies is not at all the one you expect)) I myself have repeatedly encountered this.
Try replacing with
So that the cookie file will probably end up in the same folder as the script. Don't forget to check write permissions on this folder, of course)

Answer 2

SELECT SUM(inner.`red`) FROM (
    SELECT `red` FROM abtest ORDER BY id DESC LIMIT 5
) as `inner`