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<!DOCTYPE html> <html lang="en"> <head> <title>Validate a URL for Query String in PHP</title> </head> <body> <?php // Sample website url $url = "http://www.example.com?topic=filters"; // Validate website url for query string if(filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED)){ echo "The <b>$url</b> contains query string"; } else{ echo "The <b>$url</b> does not contain query string"; } ?> </body> </html>
