Rules in yii2 Detailed explanation of custom validation rules rules card yii rules techrules

One of the powerful features of yii2 is its Form component, which is both convenient and safe. Some friends feel that after using Yii for a while, it seems to be nothing but "difficult to understand" than TP.

The leader arranged for a registration function, but this guy used Baidu’s various good form styles, and Baidu’s validate verification. I really feel sorry for this guy.

Of course, without further ado, our focus is to use ActiveForm and then how to implement custom validation rules.

Let’s talk about the scenario first:

Conditions: ①. There are two fields, A and B. ②. A has two values, 1 and 2.

The requirement is: when the user selects the value of A When it is equal to 1, the value of B must be filled in. When the value of A is equal to 2, it doesn't matter if the value of B is not written. Among them, A is required.

Let’s see how to implement it using the rules that come with Yii2

First add the following rule to its associated model

/**
* @inheritdoc
*/
public function rules()
{
return [
[['B'], 'requiredByASpecial'],
];
} 

Then implement the requiredByASpecial method in the model

/**
* 自定义验证B
*/
public function requiredByASpecial($attribute, $params)
{
if ($this->A== 1) 
{
if ($this->B=== '')
$this->addError($attribute, "B的值不可以为空.");
}
}

The above means that when A is equal to 1 and the value of B is empty, the error message "The value of B cannot be empty" is returned.

The above is just a simple example, which can be applied according to specific needs.

The above is the entire content of the yii2 rules verification rules introduced by the editor. I hope it will be helpful to everyone!

The above introduces the detailed explanation of rules custom verification rules in yii2, including rules content. I hope it will be helpful to friends who are interested in PHP tutorials.