PHP validation class: Email, password, and field validation

Last update on May 29 2025 13:07:54 (UTC/GMT +8 hours)

19. Validation Class with Static Methods

Write a class called 'Validation' with static methods to validate email addresses, passwords, and other common input fields.

Sample Solution:

PHP Code :

<?php
class Validation {
    public static function validateEmail($email) {
        // Check if the email is valid using a regular expression
        return filter_var($email, FILTER_VALIDATE_EMAIL) !== false;
    }

    public static function validatePassword($password) {
        // Here's an example that checks if the password is at least 8 characters long
        return strlen($password) >= 8;
    }

    public static function validateField($field) {
        // Here's an example that checks if the field is not empty
        return !empty($field);
    }
}

$email = "[email protected]";
$password = "password123";
$field = "";

if (Validation::validateEmail($email)) {
    echo "Email is valid.</br>";
} else {
    echo "Email is invalid.</br>";
}

if (Validation::validatePassword($password)) {
    echo "Password is valid.</br>";
} else {
    echo "Password is invalid.v";
}

if (Validation::validateField($field)) {
    echo "Field is valid.</br>";
} else {
    echo "Field is invalid.</br>";
}
?>

Sample Output:

Email is valid.
Password is valid.
Field is invalid.

Explanation:

In the above exercise -

The "Validation" class has three static methods: validateEmail(), validatePassword(), and validateField(), which validate email addresses, passwords, and other common input fields, respectively.
The "validateEmail($email)" method uses the FILTER_VALIDATE_EMAIL filter to check if the email is valid according to the provided regular expression. It returns true if the email is valid, and false otherwise.
The "validatePassword($password)" method checks if the password meets your specified requirements. In this example, it checks if the password is at least 8 characters long. It returns true if the password is valid, and false otherwise.
The "validateField($field)" method validates other common input fields. In this example, it checks if the field is not empty. It returns true if the field is valid, and false otherwise.

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP class Validation with static methods to validate email addresses and passwords, and then test these methods with various input cases.
Write a PHP script to implement a static method for validating phone numbers and another for checking URL formats in a Validation class.
Write a PHP function to validate multiple input fields using static methods and return a summary of validation statuses.
Write a PHP program to extend the Validation class with additional static methods for common data formats and test them against a sample dataset.

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