If the attributes objects is an HTML/DOM/j Query element Even though none of the built in validators are async it is sometimes useful to have async validations.One example would be to check if a username is already used by asking the server.
One solution is to use filter_var for your initial validation and then perform additional validation checks if the original filter_var validation passes.
Validating URLs is important to form handling and PHP data processing.
The validation constraints can be declared in JSON and shared between clients and the server. One thing that is a bit unorthodox is that most validators will consider undefined values (,) valid values.
So for example adding a constraint of at least 6 characters will be like saying If the attribute is given it must be at least 6 characters.
Sometimes it's nice to be able validate field differently depending on the input itself.
allows the validators object and validator options to be a function that should return the constraints/options: Validates the attributes object against the constraints.
One core value of this library is that nothing should be private or inaccessable.
If you want to modify which values are considered empty for example you can simply overwrite You can find some basic examples included in the project.
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.
If you are running a PHP version older than 5.2 you are out of luck.