Here's the simplest way to implement that.
<?php
$timeout = 3;
$old = ini_set('default_socket_timeout', $timeout);
$file = fopen('http://example.com', 'r');
ini_set('default_socket_timeout', $old);
stream_set_timeout($file, $timeout);
stream_set_blocking($file, 0);
//the rest is standard
?>
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