PHP fake average rating generator - php

Question

Let's imagine that the material has a rating of 2.7 with 7 votes.
I want to create a script that would generate my desired rating that would look real and not fake.
For example, I want the rating to change from 2.7 to 4.6, but the number of votes should also change proportionally.
I can't figure out how to implement it correctly.
My script will make the rating 6.0 as I want, but as a result the number of votes will be as high as 500+. I want to refine the script so that it is more realistic and changes the rating with minimal votes
My code:
My script will make the rating 6.0 as I want for example, but the number of votes will be as high as 500+. I want to generate the average values of the rating based on the previous values, while the deviation in the votes should not look fake.
<?php
class RatingFaker
{
private $totalRating = 10; // Maximum rating threshold (5 or 10)
private $maxRatingGenerate = 10; // We generate maximum rating values during the passage
private $minRatingGenerarate = 5; // Minimally generates a rating value during a pass
private $minRatingCheck = 3.5; // The minimum acceptable threshold from which we start to act
public function __construct($minRatingCheck)
{
$this->minRatingCheck = $minRatingCheck;
}
private function calcAverageRating($ratings = [])
{
$totalWeight = 0;
$totalReviews = 0;
foreach ($ratings as $weight => $numberofReviews) {
$WeightMultipliedByNumber = $weight * $numberofReviews;
$totalWeight += $WeightMultipliedByNumber;
$totalReviews += $numberofReviews;
}
//divide the total weight by total number of reviews
$averageRating = $totalWeight / $totalReviews;
return [
'rating' => $averageRating,
'vote_num' => $totalReviews
];
}
private function getRandVoters()
{
$randRating = rand($this->minRatingGenerarate, $this->maxRatingGenerate);
$randVoters = rand(1, 99);
return [
$randRating => $randVoters
];
}
private function ratingLoop($valueList)
{
$valueList = array_merge($valueList, $this->getRandVoters());
$newRating = $this->calcAverageRating($valueList);
if($newRating['rating'] < $this->minRatingCheck) {
$valueList = array_merge($valueList, $this->getRandVoters());
return $this->ratingLoop($valueList);
}
if($newRating['rating'] > 10) {
$newRating['rating'] = 10;
}
return [
'rating' => round($newRating['rating'], 1),
'sum' => round($newRating['vote_num'] * round($newRating['rating'], 1)),
'voters' => $newRating['vote_num']
];
}
public function check($currentRate, $currentVoteNum)
{
if($currentRate < $this->minRatingCheck) {
$rating = $this->ratingLoop([
$currentRate => $currentVoteNum,
]);
}
return $rating ?? [];
}
}
$currentRate = 2.4;
$voteNum = 88;
$oldRating = [
'rating' => $currentRate,
'sum' => round($voteNum * $currentRate),
'voters' => $voteNum
];
$rating = [];
$ratingFaker = new RatingFaker(6.0);
$rating = $ratingFaker->check($currentRate, $voteNum);
echo '<pre>';
echo 'Was:';
print_r($oldRating);
echo "<br>";
echo "<br>";
echo "<br>";
echo 'Now:';
print_r($rating);
echo '</pre>';

Answer 1

When the current rating is 2.5 based on 9 votes, and you want to get a rating of 6.0 with a minimal number of votes, you need to make sure the total value of 10 votes is 60 ( 60/10 = 6.0 ).
The current rating is : ( 2.5*9 / 9 ) = 2.5
With you extra vote it is: ( (2.5*9+x) / 10 ) = 6.0
Now you only have to find the correct value for x, which is 37.5