Here's an example of the code for implementing a Review Snippet in Google:

<div itemscope itemtype="http://schema.org/Review">
  <div itemprop="itemReviewed" itemscope itemtype="http://schema.org/Product">
    <h1 >Product Name</h1>
    <img  src="/product-image.jpg" alt="Product Image">
  </div>
  <div itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
    <span >4.5</span> out of
    <span >5</span>
  </div>
  <div  >
    <span >Reviewer Name</span>
  </div>
  <div itemprop="reviewBody">
    This product is great. I've been using it for a month and it has exceeded my expectations.
  </div>
  <div >2022-03-01</div>
</div>

In this example, we have a Review for a Product with a name and an image, a rating value (4.5) and the author's name, review body and date published. Note that the itemscope and itemtype attributes are used to define the type of schema being used, and the itemprop attribute is used to specify which property each element represents.

<div itemscope itemtype="http://schema.org/LocalBusiness">
  <h1 >Business Name</h1>
  <img  src="/business-image.jpg" alt="Business Image">
  <div  >
    <span >4.5</span> out of
    <span >5</span> based on
    <span itemprop="ratingCount">100</span> reviews.
  </div>
</div>

In this example, we have a Local Business with a name and an image, and an Aggregate Rating section that includes the rating value (4.5), the best possible rating value (5), and the number of reviews (100). Note that the itemscope and itemtype attributes are used to define the type of schema being used, and the itemprop attribute is used to specify which property each element represents.

Here's an example of the code for implementing the Business Review Aggregate Rating Schema in Google:

<div itemscope itemtype="http://schema.org/LocalBusiness">
  <h1 >Business Name</h1>
  <img  src="/business-image.jpg" alt="Business Image">
  <div itemprop="review" itemscope itemtype="http://schema.org/Review">
    <div itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
      <span >4.5</span> out of
      <span >5</span> based on
      <span itemprop="ratingCount">100</span> reviews.
    </div>
  </div>
</div>

In this example, we have a Local Business with a name and an image, and a Review Aggregate Rating section that includes the rating value (4.5), the best possible rating value (5), and the number of reviews (100). Note that the itemscope and itemtype attributes are used to define the type of schema being used, and the itemprop attribute is used to specify which property each element represents.

<div itemscope itemtype="http://schema.org/Product">
  <h1 >Product Name</h1>
  <img  src="/product-image.jpg" alt="Product Image">
  <div  >
    <span >4.5</span> out of
    <span >5</span> based on
    <span itemprop="ratingCount">25</span> ratings.
  </div>
</div>

In this example, we have a Product with a name and an image, and an Aggregate Rating section that includes the rating value (4.5), the best possible rating value (5), and the number of ratings (25). Note that the itemscope and itemtype attributes are used to define the type of schema being used, and the itemprop attribute is used to specify which property each element represents.

Here's an example of the code for implementing the Review Aggregate Rating Schema in Google:

<div itemscope itemtype="http://schema.org/Product">
  <h1 >Product Name</h1>
  <img  src="/product-image.jpg" alt="Product Image">
  <div itemprop="review" itemscope itemtype="http://schema.org/Review">
    <div itemprop="reviewRating" itemscope itemtype="http://schema.org/Rating">
      <span >4.5</span> out of
      <span >5</span> based on
      <span itemprop="ratingCount">25</span> reviews.
    </div>
  </div>
</div>

In this example, we have a Product with a name and an image, and a Review Aggregate Rating section that includes the rating value (4.5), the best possible rating value (5), and the number of reviews (25). Note that the itemscope and itemtype attributes are used to define the type of schema being used, and the itemprop attribute is used to specify which property each element represents.

PHP code that creates a form to capture review data and outputs it in the structured data format required by Google for reviews:

<?php
// Set up variables to store form data
$name = $rating = $review = '';

// Check if form is submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  // Sanitize input data
  $organname = htmlspecialchars($_POST['organname']);
  $subjectname = htmlspecialchars($_POST['subjectname']);
  $name = htmlspecialchars($_POST['name']);
  $reviewpost = htmlspecialchars($_POST['reviewpost']);

  // Output structured data for review
$review_data = array(
  '@context' => 'http://schema.org/',
  '@type' => 'Review',
  'itemReviewed'  => array(
    '@type' => 'Organization',
    'name'=> $organname,
  ),
  'reviewRating' => array(
    '@type'=> 'Rating',
    'ratingValue' => '5',
    'bestRating' => '5'
  ),
  'name'=> $subjectname,
  'author'=> array(
    '@type'=> 'Person',
    'name'=> $name,
  ),
  'reviewBody'=> $reviewpost,
);

  $json_ld = json_encode($review_data);
  $newreview = '<script type="application/ld+json">'.$json_ld.'</script>';

  // Save form data to file
  $file = fopen('reviews.txt', 'a');
  fwrite($file, "$newreview\n\n");
  fclose($file);

  // Clear form data
  $name = $rating = $review = '';
}
?>

<!-- HTML form for review data -->
<form method="post">
    
  <label for="organname">Organization Name:</label>
  <input type="text" name="organname" value="<?php echo $organname; ?>"><br>

  <label for="subjectname">Subject Name:</label>
  <input type="text" name="subjectname" value="<?php echo $subjectname; ?>"><br>

  <label for="name">Name:</label>
  <input type="text" name="name" value="<?php echo $name; ?>"><br>

  <label for="reviewpost">Review Post:</label>
  <textarea name="reviewpost"><?php echo $reviewpost; ?></textarea><br>

  <input type="submit" value="Submit">
</form>

This code creates a form with three input fields for the name, rating, and review text. When the form is submitted, the input data is sanitized and used to create a JSON-LD object with the structured data for the review. The JSON-LD object is then output in the script tag, which Google can read and use to display the review in the search results.