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Here is a more complex validation example that takes advantage of some of these built-in validation rules: Two validation rules are defined for login: it should contain letters and numbers only, and its length should be between 5 and 15.

The password field should be a minimum of 8 characters long.

Defining validation rules makes form handling much, much easier.

There are many different aspects to the validation process.

This provides a mechanism that allows a certain rule to be applied either during the creation of a new record, or during update of a record.

If a rule has defined ‘on’ = The technique outlined above gives us much more flexibility than simple rules assignment, but there’s an extra step we can take in order to gain more fine-grained control of data validation.

For the login field, only letters and numbers will be accepted, the email should be valid, and born should be a valid date.

Defining validation rules enables Cake PHP’s automagic showing of error messages in forms if the data submitted does not follow the defined rules.

If you would like to assign multiple validation rules to a single field, this is basically how it should look: As you can see, this is quite similar to what we did in the previous section.

Where, ‘field Name’ is the name of the field the rule is defined for, and ‘rule Name’ is a pre-defined rule name, such as ‘alpha Numeric’, ‘email’ or ‘is Unique’.

For example, to ensure that the user is giving a well formatted email address, you could use this rule: true, the form validation will not function correctly. As you can see here, each field (only one field shown above) is associated with an array that contains five keys: ‘rule’, ‘required’, ‘allow Empty’, ‘on’ and ‘message’. The ‘rule’ key defines the validation method and takes either a single value or an array.

The email should be a valid email address, and born should be a valid date.

Also, notice how you can define specific error messages that Cake PHP will use when these validation rules fail.