12. Choose the appropriate function declaration for the user-defined function is_leap(). Assume that, if not otherwise defined, the is_leap function uses the year 2000 as a default value:

<?php
/* Function declaration here */
{
$is_leap = (!($year %4) && (($year % 100) ||
!($year % 400)));
return $is_leap;
}
var_dump(is_leap(1987)); /* Displays false */
var_dump(is_leap()); /* Displays true */
?>

Вариант ответа 1 - A) function is_leap($year = 2000)

Вариант ответа 2 - B) is_leap($year default 2000)

Вариант ответа 3 - C) function is_leap($year default 2000)

Вариант ответа 4 - D) function is_leap($year)

Вариант ответа 5 - E) function is_leap(2000 = $year)


Комментарий: Of the five options, only two are valid PHP function declarations (A and D). Of these two declarations, only one will provide a default parameter if none is passed—Answer A.