PHP script

file-upload.php

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = $_POST["name"];
  $image = $_FILES["image"];

  // Validate name format with regular expression
  if (!preg_match("/^[A-Z][a-z]+\s[A-Z][a-z]+$/", $name)) {
    die("Invalid name format");
  }

  // Check if file is a GIF image
  $allowed_types = array("image/gif");
  if (!in_array($image["type"], $allowed_types)) {
    die("File is not a GIF image");
  }

  // Rename uploaded file to "number.gif"
  $directory = "uploads/";
  $filename = count(glob($directory . "*.gif")) + 1 . ".gif";
  $destination = $directory . $filename;
  if (!move_uploaded_file($image["tmp_name"], $destination)) {
    die("Failed to upload file");
  }

  // Append valid record to data.txt
  $record = "$name $filename";
  if (preg_match("/^[A-Z][a-z]+\s[A-Z][a-z]+\s\d+\.gif$/", $record)) {
    file_put_contents("data.txt", $record . PHP_EOL, FILE_APPEND);
  }

  echo "Upload successful";
}
?>

index.html

<form action="upload.php" method="post" enctype="multipart/form-data">
  <label for="name">Name:</label>
  <input type="text" id="name" name="name" required><br><br>
  
  <label for="surname">Surname:</label>
  <input type="text" id="surname" name="surname" required><br><br>

  <label for="image">Image (GIF format only):</label>
  <input type="file" id="image" name="image" accept=".gif" required><br><br>

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

upload.php

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = $_POST["name"];
  $image = $_FILES["image"];
  
  // Validate name format with regular expression
  if (!preg_match("/^[A-Z][a-z]+\s[A-Z][a-z]+$/", $name)) {
    die("Invalid name format");
  }
  
  // Check if file is a GIF image
  $allowed_types = array("image/gif");
  if (!in_array($image["type"], $allowed_types)) {
    die("File is not a GIF image");
  }
  
  // Rename uploaded file to "number.gif"
  $directory = "uploads/";
  $filename = count(glob($directory . "*.gif")) + 1 . ".gif";
  $destination = $directory . $filename;
  if (!move_uploaded_file($image["tmp_name"], $destination)) {
    die("Failed to upload file");
  }
  
  // Write name and filename to data.txt
  $data_file = "data.txt";
  $data_line = "$name $filename\n";
  file_put_contents($data_file, $data_line, FILE_APPEND);
  
  echo "Upload successful";
}
?>