How do i get if a boolean is set to true in a config? [closed]

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I am making a maintenance page and you can set maintenance to true in PHP like this:

$maintenance = false;

And I want a function to include on every page, like this

include 'example.php';
maintenance_mode();

And the function should re-direct the user to the maintenance page.

Answer 1

   function isMaintenance($maintenance)
   {
     if(isset($maintenance) && $maintenance){
        header("location:maintenace_page.php");
        exit();
     }          
   }

In config.php add $maintenance variable,

  $maintenance =true;

and include isMaintenance($maintenance) function page and config page in respective page or if you already included any common file all the pages then use that file and add mentioned stuff into that page.