<?php

// blocking file I/O
$file_data = file_get_contents('/path/to/file.dat');

// blocking network I/O
$curl = curl_init('http://example.com/example-microservice');
$result = curl_exec($curl);

// some more blocking network I/O
$result = $db->query('SELECT id, data FROM examples ORDER BY id DESC limit 100');

?>