How can the use of separate variables for day, month, and year in PHP impact the accuracy and ease of age calculation from a birthdate?

When using separate variables for day, month, and year in PHP to represent a birthdate, it can make age calculation more complex and error-prone. To accurately calculate age, it's better to use the DateTime class in PHP, which provides built-in methods for date calculations such as finding the difference between two dates. 

// Using the DateTime class to calculate age from a birthdate
$birthdate = '1990-05-15';
$today = new DateTime();
$birthday = new DateTime($birthdate);
$age = $today->diff($birthday)->y;

echo "Age: " . $age;

Keywords

PHP variables age calculation birthdate accuracy

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