// Check if form is submitted
if(isset($_POST['submit'])) {
  // Get URL and search string from form
  $url = $_POST['url'];
  $searchString = $_POST['searchString'];

  // Get all files in parent URL and child folders
  $files = glob($url . '/**/*.*', GLOB_BRACE);

  // Initialize array to store matching files
  $matchingFiles = array();

  // Loop through files and search for search string
  foreach($files as $file) {
    // Check if file is a directory
    if(is_dir($file)) {
      continue;
    }

    // Read file contents
    $fileContents = file_get_contents($file);

    // Check if file contents contain search string
    if(strpos($fileContents, $searchString) !== false) {
      // Add file to matching files array
      $matchingFiles[] = $file;
    }
  }

  // Display matching files in table
  if(count($matchingFiles) > 0) {
    echo '<table>';
    echo '<tr><th>Matching Files</th></tr>';
    foreach($matchingFiles as $matchingFile) {
      echo '<tr><td>' . $matchingFile . '</td></tr>';
    }
    echo '</table>';
  } else {
    echo 'No matching files found.';
  }
}

// Check if download button is clicked
if(isset($_POST['download'])) {
  // Get selected files from form
  $selectedFiles = $_POST['selectedFiles'];

  // Loop through selected files and download them
  foreach($selectedFiles as $selectedFile) {
    // Get file name
    $fileName = basename($selectedFile);

    // Set headers for download
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . $fileName . '"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($selectedFile));

    // Read file and output to browser
    readfile($selectedFile);
  }
}
?>

<form method="post">
  <label for="url">URL:</label>
  <input type="text" name="url" id="url"><br>

  <label for="searchString">Search String:</label>
  <input type="text" name="searchString" id="searchString"><br>

  <input type="submit" name="submit" value="Search">
</form>