How can PHP developers efficiently integrate weekday names into their code for calendar functionality?

To efficiently integrate weekday names into PHP code for calendar functionality, developers can use the date() function along with the 'l' parameter to retrieve the full name of the weekday based on a given date. This allows for easy display or manipulation of weekday names in calendar-related applications.

$date = "2023-09-15";
$weekday = date('l', strtotime($date));
echo $weekday; // Outputs 'Friday'