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PHP: Detect Page Refresh

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余生分开走
余生分开走 2020-11-28 13:54

I have a page action.php on which I run an SQL query through the code, so that whenever the page is viewed the query runs like its like counting page vi

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  • 醉梦人生
    2020-11-28 13:54

    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;

?>
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  • 被撕碎了的回忆
    2020-11-28 13:57

    This can work in your scenario:

    if(isset($_GET["token"])) {
    $view_token = $_GET["token"];
} else {
    $new_views = $views + 1;
    // UPDATE VIEWS
    $view_token = substr(str_shuffle(str_repeat("0123456789abcdefghijklmnopqrstuvwxyz", 5)), 0, 5);
    header("Location: ?token=$view_token");
}

    If the user has a token in the URL, the view count will not update. Therefore, if the user tries to refresh, it will not update the view count. When the user does not have a token in the URL, the view count updates and refreshes the page WITH a token. It is thinking outside of the box but it works!

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  • [愿得一人]
    2020-11-28 14:02

    i have solved the problem ... HURRAHHH with no session & no cookies

    the solution is a combination of PHP : AJAX : JavaScript

    the query that you want to run on Page Load & not on page Refresh run it as via AJAX call lets say my function for doing that is 

    function runQUERY()
{
    xmlhttp=new XMLHttpRequest();
    xmlhttp.open("POST","doIT.php",false);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    xmlhttp.send();
}

    and i can simply check with Javascript that the page is a fresh load or its a refresh by doing the following

    <head>
<script type="text/javascript">
function checkRefresh()
{
    if( document.refreshForm.visited.value == "" )
    {           
        // This is a fresh page load
            alert ( 'Fresh Load' );
        document.refreshForm.visited.value = "1";
            ..call you AJAX function here
    }
    else
    {
        // This is a page refresh
        alert ( 'Page has been Refreshed, The AJAX call was not made');

    }
}
</script>    
</head>

<body onLoad="checkRefresh()">

<form name="refreshForm">
<input type="hidden" name="visited" value="" />
</form>

</body>
</html>

    and in your doIT.php simple add your PHP code which you were going to put in the normal page

    <?php
mysql_query("UPDATE---------");
//put any code here, i won't run on any page refresh
?>
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  • 猫巷女王i
    2020-11-28 14:03 
        //here you get the url behind the domain.
    $currentPage = $_SERVER['REQUEST_URI']; 

    //if the session current page is not set.
    if(!isset($_SESSION['currentPage'])){ 

      //set the session to the current page.
      $_SESSION['currentPage'] = $currentPage;     
    }

    //check if the session is not equal to the current page
    if($_SESSION['currentPage'] != $currentPage){

       // if it's not equal you set the session again to the current page.
       $_SESSION['currentPage'] = $currentPage;

       //set the query you want to use
    }
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  • 终归单人心
    2020-11-28 14:05

    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.

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  • 野趣味
    2020-11-28 14:07

    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";
}
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