PHP: Detect Page Refresh

I found this snippet here, and it worked perfectly for me:

$pageWasRefreshed = isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] === 'max-age=0';

if($pageWasRefreshed ) {
   //do something because page was refreshed;
} else {
   //do nothing;
}

Best way to Detect Page Refresh. or Not ?(Ctrl+F5,F5,Ctrl+R, Enter)

$pageRefreshed = isset($_SERVER['HTTP_CACHE_CONTROL']) &&($_SERVER['HTTP_CACHE_CONTROL'] === 'max-age=0' ||  $_SERVER['HTTP_CACHE_CONTROL'] == 'no-cache'); 
if($pageRefreshed == 1){
    echo "Yes page Refreshed";
}else{
    //enter code here
    echo "No";
}

If you just want to run it once for a user, I would set a session cookie and then use an if() statement.

<?php
session_start();

if (!$_SESSION['loaded'])
{
    // insert query here
}

$_SESSION['loaded'] = true;

?>

You can't directly detect a page refresh, but you can use a cookie to simulate what you want:

if (isset($_COOKIE['action'])) {
  // action already done
} else {
  setcookie('action');
  // run query
}

Depending on your requirements, you also need to decide when to remove the cookie and/or perform the action again.