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Validation Constraints Reference
The Validator is designed to validate objects against constraints.
In real life, a constraint could be: "The cake must not be burned". In
Symfony2, constraints are similar: They are assertions that a condition is
true.
Supported Constraints
The following constraints are natively available in Symfony2:
Basic Constraints
These are the basic constraints: use them to assert very basic things about the value of properties or the return value of methods on your object.