How to calculate the day of the year (ordinal date) for a given date using DateTime in PHP?

To calculate the day of the year for a given date using DateTime in PHP, you can use the following steps:

1. Create a new instance of the DateTime class, passing the given date as a parameter in the format "YYYY-MM-DD".

   $date = new DateTime('2022-07-15');

2. Use the format() method of the DateTime object with the 'z' format specifier to get the day of the year (ordinal date).

   $dayOfYear = $date->format('z') + 1;

   The 'z' format specifier returns the day of the year starting from 0, so you need to add 1 to get the ordinal date.

3. You can then echo or use the $dayOfYear variable as per your requirement.

   echo "The day of the year is: " . $dayOfYear;

Here is the complete code:

This code will output: "The day of the year is: 196" for the given date "2022-07-15".