How to determine whether the thinkphp5 template is a positive number

In the ThinkPHP5 framework, judging whether a number is a positive number can be judged by using the built-in validator of TP. Validators can be implemented through classes or through built-in function verification.

This article will introduce how to use the TP built-in function verification method to verify whether the numerical value is positive.

1. How to define verification rules?

TP5 provides built-in function verification methods to verify data, including integers, floating point numbers, dates, etc., which can all be verified through built-in functions. When defining validation rules, you need to use the rule() method in the validator class. Our code for defining validation rules is similar to the following:

$validate = new \think\Validate([
    'num'  => 'require|number|gt:0',
]);

In the code, we define the validation rules for the num field. This field needs to meet the following three restrictions:

• Required (require)
• Number type (number)
• is greater than 0 (gt:0)

This example demonstrates how to define validation rules to ensure that the values ​​we enter is a positive number.

2. How to verify whether the value is positive?

The way to verify whether the value is positive is to use the validate() function. Passing in the value to be verified and the verification rules in this function can complete the verification. The validate function will return a Boolean value to indicate whether the verification is passed.

The rules have been defined before, now let’s verify whether the value is a positive number:

$result = $validate->check([
    'num' => 10.2
]);

The verification function returns true. When the return value of the verification function is true, it means the verification is passed, otherwise it means the verification is passed. Fail.

Use the validate() function to verify whether the value of the num field in the specified form is a positive number.

3. How to encapsulate this function so that it can be used multiple times?

Through function encapsulation, we can more conveniently use a common verification rule and avoid repeatedly writing the same verification code in different places. Now we encapsulate a function named "isPositiveNumber" to verify whether the input value is a positive number.

/**
 * 验证数值是否为正数
 * @param float $value 需要验证的值
 * @return bool 验证结果
 */
function isPositiveNumber($value): bool{
    //定义验证规则
    $validate = new \think\Validate([
        'num'  => 'require|number|gt:0',
    ]);
    //执行验证
    return $validate->check([
        'num' => $value
    ]);
}

In this code we define the function isPositiveNumber, which receives a value as a parameter, passes the value as the num field to the validator for verification, and finally returns the verification result.

Through this encapsulated code, we can reference this function where positive numbers need to be verified to determine whether the input value is a positive number.

Conclusion

Through the above introduction, we have learned how to use the function verification method of the built-in validator in ThinkPHP5 to verify whether the input value is a positive number. If you need to use the function of verifying positive numbers multiple times in your project, you can implement it through function encapsulation to improve code reusability and maintainability.

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