Problem integrating the OpenAI API with my website using XAMPP and PHP - php

Question

I am creating a local website that makes use of the OpenAI API using XAMPP and HTML/CSS and PHP. I have implemented a page to enter a question and display the answer from the API, but the result has no relation to the question asked. I am looking for help to solve this problem. Here is my php code (it works with another file calling it).
Thanks in advance for your help.
PS: I voluntarily removed the api key when I posted the request on stack overflow
Translated with www.DeepL.com/Translator (free version)
<?php
$apiKey = 'sk-';
$modelId = 'text-davinci-002';
$prompt = "";
$temperature = 0.5;
$maxTokens = 256;
$topP = 1;
$frequencyPenalty = 0;
$presencePenalty = 0;
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => "https://api.openai.com/v1/completions",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 0,
CURLOPT_FOLLOWLOCATION => false,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS =>"{\"model\": \"".$modelId."\",
\"prompt\": \"".$prompt."\",
\"temperature\": ".$temperature.",
\"max_tokens\": ".$maxTokens.",
\"top_p\": ".$topP.",
\"frequency_penalty\": ".$frequencyPenalty.",
\"presence_penalty\": ".$presencePenalty."}",
CURLOPT_HTTPHEADER => array(
"Authorization: Bearer ".$apiKey,
"Content-Type: application/json"
),
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
$result = json_decode($response);
echo $result->choices[0]->text;
}
?>
I tried several solutions such as changing the API model and rewriting the code, but I could not solve the problem. I am looking for help to solve this problem.