Validating the url

To instruct the validator to ignore the user's ID, we'll use the The field under validation must be a valid URL.In some situations, you may wish to run validation checks against a field only if that field is present in the input array.If you are running a PHP version older than 5.2 you are out of luck.There is also a bug in PHP 5.2.13 and PHP 5.3.2 that will not allow URLs with dashes in them to validate.Validating the format of an URI is one of those problems that periodically arises when you are validating model attributes in Rails.There are tons of solutions available on the web, but the 90% of them are usually based on complex regular expressions and they often made custom (and perhaps too restrictive) assumptions.First, create a Let's assume our web application is for game collectors.If a game collector registers with our application and they own more than 100 games, we want them to explain why they own so many games.

The PHP filter_var function has only been available since PHP 5.2.

If you are unsure of your PHP version you can run php -v from the command line if you have command line PHP installed, or create a PHP file with the following contents and navigate to it using your web browser: There is a lot of debate about whether using a regular expression is a good idea when doing URL validation.

If you are uncertain and looking for a guide then this may help: If you are using a version of PHP that is older than PHP 5.2: - Use the regular expression approach If you are using PHP 5.2.13 or PHP 5.3.2 and need URLs with dashes to validate: - Use the regular expression approach If you don't fall into one of the above categories: - Use the filter_var() approach Note: Some have complained that using the PHP filter_var() function is too permissive and allows URLs that should not validate.

First, let's assume we have the following routes defined in our object.

If the validation rules pass, your code will keep executing normally; however, if validation fails, an exception will be thrown and the proper error response will automatically be sent back to the user.

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Sometimes you may wish to stop running validation rules on an attribute after the first validation failure.

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