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How do you implement custom validation logic in Yii? - Code Stap
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How do you implement custom validation logic in Yii?

How do you implement custom validation logic in Yii?

Answer: In Yii, you can implement custom validation logic by creating a custom validator class or by overriding the `rules()` method in your model. Here’s a short overview of both methods:

1. Custom Validator Class:
– Create a new class that extends `yiivalidatorsValidator`.
– Implement the `validateAttribute()` method to define your custom validation logic.
– Use this custom validator in your model’s `rules()` method.

“`php
class MyCustomValidator extends yiivalidatorsValidator {
protected function validateAttribute($model, $attribute) {
// Custom validation logic
if ($model->$attribute < 0) { $this->addError($model, $attribute, ‘Value must be non-negative.’);
}
}
}
“`

2. Overriding `rules()` Method:
– In your model, add a custom validation method.
– Reference this method in the `rules()` method.

“`php
public function rules() {
return [
[‘attribute_name’, ‘validateMyCustomRule’],
];
}

public function validateMyCustomRule($attribute, $params) {
if ($this->$attribute < 0) { $this->addError($attribute, ‘Value must be non-negative.’);
}
}
“`

This allows you to create flexible and reusable validation rules tailored to your application’s needs.

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