Validation

Lemon has tool that simplifies validating. Let's start by validating request.

To validate request, there is method validate().

$validation = $request->validate([
    'name' => 'max:16'
]);

if (!$validation) {
    return template('foo', error: 'Bad data');
}

In this method we provide validating rules. Theese rules are in format request-key => rule. If some rule doesn't pass, this method returns false. If the key does not exist, it also returns false.

So if we send request with data name=foo, it will pass, however, if we send name=foobarbazfoobarbazfoobarbaz or foo=barr, it won't.

All the rules are separated by | and arguments for the rules are provided using :.

Let's see all the rules.

Rule	Description
numeric	Value is number
notNumeric	Value is not number (but it can contain numbers)
email	Value is email
url	Value is url
color	Value is hexadecimal color
max:number	Value is smaller than given number
min:number	Value is bigger than given number
regex	Value matches regex
notRegex	Value doesn't match regex
contains	Value contains regex
doesntContain	Value doesn't contain regex

Custom rules

To create custom rule, we first have to access the rules, to do that simply use \Lemon\Validator::rules() method. and then add the rule using rule() method.

\Lemon\Validator::rules()->rule('upperCase', function(string $target) {
    return ctype_upper($target);
});