how to refresh page in a specific time - php

Question

i tried this code in my wp page but its not work
<?php
$page = $_SERVER['PHP_SELF'];
$sec = "10";
date("d-m-Y H:i:s");
$time= date("H:i:s");
if($time == "03:40:00")
{
echo "The new page loading in 10 seconds!";
header("Refresh: $sec; url=$page");
}
?>

Answer 1

You can't do this in PHP, what you can do for such a task is to calculate a time difference and make it in seconds and set the header for the page to be refreshed after the time diff in seconds, something like this:
<?php
$page = $_SERVER['PHP_SELF'];
$datetime1 = new DateTime('2020-05-23 18:20:10');
$datetime2 = new DateTime('2020-05-23 18:20:30');
$interval = $datetime2->diff($datetime2);
$diff = $datetime2->getTimestamp() - $datetime1->getTimestamp(); // diff in seconds
// you can just have `redirect` queryString params passed like this.
if(empty($_GET['redirect'])) {
header("Refresh: $diff; url=$page" . "?redirect=1");
}
Something to point out here, is to use tag to do the refresh in your page instead of using header(), it feels cleaner to me as implementation, specially if you already have a template engine:
<meta http-equiv="refresh" content="20">

Answer 2

You can place the below code in your header and test. I hope this helps.
if ($time == "03:40:00") {
echo "The new page loading in 10 seconds!";
echo "<meta http-equiv='refresh' content='3'>";
}
Note: The above used meta tag is used to define time intervals to refresh the document itself. Modify the values in "content" attribute of meta tag as you wish to refresh the page

Answer 3

Thank you everyone, problem solved, i used javascript, function auto-run
<script>
(function myFunction() {
var time = new Date().getHours()
if( time == "02" ) {
setTimeout(function(){
window.location = 'your url';
}, 5000);
}
})();
</script>

Answer 4

this code better i think, thank you Andrew Moore !
<script>
function refreshAt(hours, minutes, seconds) {
var now = new Date();
var then = new Date();
if(now.getHours() > hours ||
(now.getHours() == hours && now.getMinutes() > minutes) ||
now.getHours() == hours && now.getMinutes() == minutes && now.getSeconds() >= seconds) {
then.setDate(now.getDate() + 1);
}
then.setHours(hours);
then.setMinutes(minutes);
then.setSeconds(seconds);
var timeout = (then.getTime() - now.getTime());
setTimeout(function() { window.location.reload(true); }, timeout);
}
refreshAt(16,30,0); //Will refresh the page at 4:30pm
</script>