php - CMS and Displaying custom 404 page -

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This is just a random question. I have heard of some CMS which can be easily managed where the root site 404 pages can display if the administrator asks them to display it instead of the website, then the user just wants to put the site down for maintenance. I was just trying to see, so I could understand how this work was completed. 

  if ($ Down_flag === true) {header ('http / 1.0 404 not met'); ('404.php'); Go out; }

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