Yii2 validator (Validator) usage analysis

This article mainly introduces the usage of Yii2 Validator (Validator), and analyzes the related functions, formats, usage methods and precautions of Yii2 Validator (Validator) in the form of examples. Friends in need can refer to it

The example in this article describes the usage of Yii2 validator (Validator). Share it with everyone for your reference, the details are as follows:

Let’s first look at the use of the validator.

public function rules()
{
  return [
    [['email', 'password'], 'required'],
    ['password', 'string', 'min'=>6],
  ];
}

As shown above, the validator is mainly used in rules to verify the attribute values ​​​​in the current model to check whether it meets certain requirements.

Verifier usage format:

The writing format is: [attributes that need to be verified, validator name, validator parameters].

If the attributes that need to be verified are multiple available arrays, if one attribute is available, a string can also be represented by an array.

Each attribute can have multiple validators. For example, the password above uses two validators: required and string.

Commonly used validators:

Yii2 has built-in some commonly used validators. All validators inherit from the base class yii\validators\Validator. I can roughly summarize there are several categories.

Number related:

integer - integer
is used to detect whether the attribute value is an integer, as well as maximum and minimum value detection, etc. . (yii\validators\NumberValidator)

double - Floating point
is used to detect whether the attribute value is a floating point number, that is, a decimal. (yii\validators\NumberValidator)

number——Number
This is exactly the same as the double above, except that it uses 2 names. (yii\validators\NumberValidator)

Format related:

date——Date
Check whether the attribute value is in the correct date format . (yii\validators\DateValidator)

email - Email
Detects whether the attribute value is in the correct email format. (yii\validators\EmailValidator)

url——URL
is used to determine whether the attribute value is the correct url address. (yii\validators\UrlValidator)

Perform function processing on values:

filter——Filter
This is for attribute values processed. Such as prefixing attribute values, replacing specific strings, etc. (yii\validators\FilterValidator)

trim——Trimming
This is used to process the attribute value. Just remove the spaces on both sides of the string, or the specified string. (yii\validators\FilterValidator)

Upload file verification:

file——File
This is mainly for uploading Verify the file, such as format, size, etc. (yii\validators\FileValidator)

image——Picture
This is similar to the file validator above, but it is specially used to verify images. (yii\validators\ImageValidator)

Judgment comparison:

compare——Comparison
is used to compare two attribute values. , such as equality, greater than, less than comparison, etc. (yii\validators\CompareValidator)

in - Contains (range)
is used to detect whether the attribute value is included in the specified array. (yii\validators\RangeValidator)

exist——Exist
is used to detect whether this attribute value already exists in the data table. (yii\validators\ExistValidator)

unique——Uniqueness
This is similar to exist, used to detect whether the value is unique. (yii\validators\UniqueValidator)

string——String
Judges the length of attribute values, such as maximum length, minimum length, etc. (yii\validators\StringValidator)

boolean - Boolean type
is used to check whether the value of the attribute is a Boolean value. (yii\validators\BooleanValidator)

default - Default value
This is used to set the default value for the attribute. For example, when the attribute value is null, set it to an empty default value. (yii\validators\DefaultValueValidator)

required——Required
This is used to check whether the attribute value is empty. (yii\validators\RequiredValidator)

captcha——Verification code
This is mainly used to verify the verification code when the interface uses the verification code. (yii\captcha\CaptchaValidator)

match - Regular expression
is more powerful and is used to detect whether the attribute value matches the given regular expression. Basically everything listed above can be implemented using this. (yii\validators\RegularExpressionValidator)

Others:

safe——Safety
This does not perform verification and is only used to specify that the attribute value is safe. (yii\validators\SafeValidator)

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