How can regular expressions be used in PHP to create dynamic URL redirections?

Regular expressions can be used in PHP to create dynamic URL redirections by matching patterns in the requested URL and redirecting to a different URL based on those patterns. This can be useful for creating clean and user-friendly URLs or handling URL parameters dynamically. By using regular expressions to match specific patterns in the requested URL, we can easily redirect users to the appropriate page or resource. 

// Example of using regular expressions for dynamic URL redirection in PHP

// Get the requested URL
$request_url = $_SERVER['REQUEST_URI'];

// Define a regular expression pattern to match specific URLs
$pattern = '/^\/blog\/([0-9]+)\/([a-z0-9-]+)$/';

// Check if the requested URL matches the pattern
if (preg_match($pattern, $request_url, $matches)) {
    // Extract the matched parameters
    $post_id = $matches[1];
    $post_slug = $matches[2];
    
    // Redirect to the dynamic URL based on the matched parameters
    header("Location: /blog-post.php?id=$post_id&slug=$post_slug");
    exit();
}

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