Can PHP scripts be used to generate custom 404 error pages in cases where .htaccess is not available?

When .htaccess is not available, PHP scripts can be used to generate custom 404 error pages. This can be achieved by using PHP to check the requested URL and then outputting a custom error page if the URL does not match any existing pages on the server. 

<?php
if ($_SERVER['REQUEST_URI'] == '/non-existent-page') {
    header("HTTP/1.0 404 Not Found");
    include('404-error-page.php');
    exit();
}
?>

Keywords

PHP custom 404 error pages .htaccess error handling web development

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