DELAYS the program executions by a given number of µs, (microseconds) .
<?php
void usleep ( int $microseconds )
where,
$microseconds = Number of microseconds to delay the program execution
?>
EXERCISE
<?php
$lang = 'en';
$str_tzg = date_default_timezone_get();
$pt = 'Fuso horário atual:<br>';
$en = 'Current Time Zone:<br>';
$jp = 'タイムゾーンセット：<br>';
echo '<br>' . $$lang . ' ' . $str_tzg . '<br><br>';
echo date("l F d Y H:i:s");
echo '<br><br>';
$microtime2sleep = 3000000;
// 3 seconds
usleep($microtime2sleep);
echo date("l F d Y H:i:s");
?>