What are common errors encountered when using the checkdate function in PHP?

Common errors encountered when using the checkdate function in PHP include passing incorrect parameters or using the function incorrectly. To avoid these errors, ensure that you pass the month, day, and year values in the correct order and format. Additionally, make sure to properly handle any return values or error messages that the function may generate.

// Example of using checkdate function with proper error handling
$month = 12;
$day = 31;
$year = 2021;

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