Download file on page load php

WP file download, the WordPress file manager changelog. All the updates and version details

Hiya guys. This maybe a very stupid question, but, I've searched everywhere for a possible solution. Sometimes when I log out or try to access the index.php page, the browser tries to download it as opposed to opening it. i.e. sometimes a dialog box appears saying "downloading file" and it downloads index.php, asks if I want to open/close or cancel.
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In my page user can download a file. Now what i want is user can will click on a button and then site will be redirect to another page and after loading the page download should start automatically. i tried like this Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load DownloadFile(filepath) End Sub

If PHP and PHP/MapScript were installed properly, several tables should be displayed on your page, and ‘MapScript’ should be listed in the ‘Extensions’ table.

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