convert to timestamp php

<?php 
echo date('m/d/Y H:i:s', 1541843467); 
?> $s = '06/10/2011 19:00:02';
$date = strtotime($s);
echo date('d/M/Y H:i:s', $date);
The above one is the one of the example of converting a string to date.
echo $s ->format('Y-m-d');
The above one is another method <?php

echo time();

?>$date = '25/05/2010';
$date = str_replace('/', '-', $date);
echo date('Y-m-d', strtotime($date));
$s = '08/11/2010 19:37:02';
$date = strtotime($s);
echo date('Y-m-d H:i:s', $date);