# Calculate Age from Date of Birth in PHP: Step-by-Step Guide

To calculate age from a date of birth in PHP, you can use the `DateTime` class along with some basic arithmetic. Here’s a step-by-step guide on how to achieve this:

Step 1: Get the Date of Birth (DOB) from the user or any other data source.

``\$date_of_birth = '1990-06-15';``

Step 2: Create a `DateTime` object for the date of birth.

``\$DOB = new DateTime(\$date_of_birth);``

Step 3: Get the current date as a `DateTime` object.

``\$current_date = new DateTime();``

Step 4: Calculate the difference between the current date and the date of birth.

``\$age_interval = \$current_date->diff(\$DOB);``

Step 5: Extract the calculated age from the `\$age_interval` object.

``\$age = \$age_interval->y;``

The variable `\$age` now contains the calculated age based on the date of birth. You can use it for further processing or display.

Here’s the complete code in one block:

``````<?php
\$date_of_birth = '1990-06-15';
\$DOB = new DateTime(\$date_of_birth);
\$current_date = new DateTime();
\$age_interval = \$current_date->diff(\$DOB);
\$age = \$age_interval->y;

echo "Age: " . \$age . " years";
?>``````

The output will be something like:

``Age: 31 years``

In this example, we use the `DateTime` class to handle dates and calculate the difference (interval) between the current date and the date of birth. The `diff()` method of `DateTime` calculates the difference and returns a `DateInterval` object, from which we extract the number of years using the `y` property.

This method accounts for leap years and handles the edge cases correctly, ensuring accurate age calculation.