blocking-io.php

<?php

// Connect to mySQL (*blocking*)
$link = mysqli_connect("localhost", "user", "password", "test");

// Run a query and store result object (*blocking*)
if($result = mysqli_query($link, "SELECT * FROM Person")) {
  
  // Fetch data from phps internal buffer into $data
  $data = mysqli_fetch_all($result);

  // Output the data to the browser
  print_r($data);
}