php - Using isset to display page content -

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i having issue using isset display content on page.

my php file called messages.php

i directing users links url: messages.php?inbox using if(isset($_get['inbox'])) { } display users inbox. same principle other users options such compose message is: messages.php?compose again using isset

the problem have cannot stop people manually typing stuff domain.com/messages.php or domain.com/messages.php?somethingrandom.

is there way direct users messages.php?inbox when type in address bar isnt assigned isset?

i did try use switch couldnt seem work how ive laid out html.

an example of whole file here http://pastebin.com/sfqn2l7g

i new php , think may have gone down complicated route.

any advice appreciated.

thanks

the answer added work, having array of valid options maybe check against later on.

$validpages = array('inbox', 'compose'); $pagefound = false;  foreach ($validpages $validpage) {     if (isset($_get[$validpage])) {         $pagefound = true;         break;     } }  if (! $pagefound) {     header('location: /messages.php?inbox'); }

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