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# PHP FILTER_VALIDATE_URL Filter * * Complete PHP Filter Reference](#) ## Example Determine if the URL format is correct: The output of the above code is: is a valid URL * * * ## Definition and Usage The FILTER_VALIDATE_URL filter validates a value as a URL. * Name: "validate_url" * ID-number: 273 Possible flags: * FILTER_FLAG_SCHEME_REQUIRED - Requires the URL to be RFC-compatible (e.g., * FILTER_FLAG_HOST_REQUIRED - Requires the URL to contain a hostname (e.g., * FILTER_FLAG_PATH_REQUIRED - Requires the URL to have a path after the domain name (e.g., www..com/example1/test2/) * FILTER_FLAG_QUERY_REQUIRED - Requires the URL to have a query string (e.g., "example.php?name=Peter&age=37") * * * ## Example The following example removes illegal characters from the variable $url, then checks if it is a valid URL: ## Example The output of the code is as follows: is a valid URL The following checks if the URL contains a valid query string: ## Example The output of the code is as follows: is not a valid URL is a valid URL * * Complete PHP Filter Reference](#)