how to get timestamp in php code example

Example 1: php datetime object get unix timestamp

$date = new DateTime();
echo $date->getTimestamp();

Example 2: timestamp php

<?php
$date = new DateTime();
echo $date->getTimestamp();
?>

Example 3: php timestamp

<?php

echo time();

?>

Example 4: timestamp php

<?php
$date = date_create();
echo date_timestamp_get($date);
?>