How can the checkdate function in PHP help with validating dates?

The checkdate function in PHP can help with validating dates by checking if a given date is valid or not. It takes three parameters (month, day, year) and returns true if the date is valid, and false if it is not. This can be useful when working with user input or date manipulation to ensure that the date being used is a valid one.

// Example of using the checkdate function to validate a date
$month = 12;
$day = 31;
$year = 2022;

if (checkdate($month, $day, $year)) {
    echo "Valid date";
} else {
    echo "Invalid date";
}