Passing a page number from one PHP file to another using a JavaScript function

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I'm working on a website with the following URL structure:

I'm trying to pass the current page number from index.php to myphpscript.php using a javascript function:

<script>
function swapContent(filterchoice){
    var PageNum = <?php echo json_encode($_GET["page"]); ?>;
    var url = "myphpscript.php";
    $.post(url, {contentVar: filterchoice, page : PageNum}, function(data){
        $("#myDiv").html(data).show();
    });
}
</script>

On myphpscript.php, when adding the following condition for the http://ift.tt/tv1JJF case to get $page_number=1:

if (isset($_POST['page'])) {
    $page_number = $_POST["page"];
}
else {
    $page_number = 1;
}
echo $page_number;

It doesn't seem to echo anything for the default home page but echo the proper page number for all the other page with page= in the URL. However, the isset condition seems to work properly on index.php even for the default home page with:

if (isset($_GET["page"])) {
    $page_number = $_GET["page"];
}
else {
    $page_number = 1;
}

Could you explain me why it works for the second case and not the first one and how I can set $page_number=1 in myphpscript.php if I'm on the default home page.

asked 1 min ago

LaGuille

161

Passing a page number from one PHP file to another using a JavaScript function