PHP redirection goes wrong - php

Question

I submit all forms of my website to a specific page page form_submition.php, after processing the form data I redirect to another page index.php?page=some page using header function
but in one of my forms that named main_form I get a wrong redirection
if(isset($_POST['form1']))
{
// process form data
header('Location: ../index.php?page=some page')
}
if(isset($_POST['form2']))
{
// process form data
header('Location: ../index.php?page=some page')
}
$to=$_GET['to']
if (isset($_POST['main_form']) ) {
// process form data
}
header("Location: ../index.php?page={$to}&error_loc_{$error_loc}=1&err_msj=" . $err_msj, true, 302);
exit();
but it redirects me to mywebsite.com/folders/form_submitions.php?to=all_p
instead of mywebsite.com/index.php?page=all_p
any ideas?
UPDATE 1
I checked my code a lot, it seems that the header is not redirecting the page at all. the strange thing is that the page at mywebsite.com/index.php?page=all_p gets loaded but the url won't change and the css+js files not loaded because the relative path becomes invalid.
UPDATE 2
Further Checking my code, before submitting the main_form to form_submission.php I open a new window with javascript to print some data. the following is the form:
<form enctype='multipart/form-data' action='./forms/form_submitions.php?to=all_p' onsubmit="return checkfiles('attachfiles')">
.
.
.
<button id="main_form" name="main_form" class="btn btn-primary">Save Changes</button>
</form>
I call the following function when #main_form is clicked:
$("#main_form").on('click', function(event) {
newWin = window.open('printingpage.php?data='+ data);
setTimeout(function () { newWin.print(); }, 500);
});
Here the printing function won't return unless the print preview is closed. I think this creates the problem, because when I remove the newWin.print() function, everything works just fine.
is there any ways to make this printing asynchronous?

Answer 1

remove .. parts in your paths & try.
So the code will be :
if(isset($_POST['form1']))
{
// process form data
header('Location: /index.php?page=some page')
}
if(isset($_POST['form2']))
{
// process form data
header('Location: /index.php?page=some page')
}
$to=$_GET['to']
if (isset($_POST['main_form']) ) {
// process form data
}
header("Location: /index.php?page={$to}&error_loc_{$error_loc}=1&err_msj=" . $err_msj, true, 302);
exit();

Answer 2

Try this. Put your web link in your redirection link.
$data = array(
'page' => $to,
'error_loc_'.$error_loc => 1,
'err_msj' => $err_msj
);
header("Location: http://www.mywebsite.com/index.php?".http_build_query($data), true, 302);
Hope this helps.