How can PHP developers ensure that their code handles different types of URLs (e.g., PHP vs. HTML) without causing unexpected behavior or errors?

PHP developers can ensure their code handles different types of URLs by checking the file extension of the requested URL and routing the request accordingly. By using a combination of PHP's `$_SERVER['REQUEST_URI']` and `pathinfo()` functions, developers can extract the file extension and determine how to handle the request based on whether it is a PHP or HTML file. 

$url = $_SERVER['REQUEST_URI'];
$extension = pathinfo($url, PATHINFO_EXTENSION);

if ($extension == 'php') {
    // Handle PHP file
    include($url);
} elseif ($extension == 'html') {
    // Handle HTML file
    echo file_get_contents($url);
} else {
    // Handle other file types or invalid URLs
    echo 'Invalid URL';
}

Keywords

URL parsing PHP functions error handling HTML vs. PHP validation

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