<?php
function factorial($n) {
$result = 1;
for ($i = 1; $i <= $n; $i++) {
$result *= $i;
}
return $result;
}
echo factorial(5);
?
What is the purpose of the return statement in PHP functions?
A). To output a value from the function and terminate its execution
B). To specify the return type of the function
C). To declare a variable within the function
D). To terminate the function execution
Which PHP feature allows defining functions with a variable number of arguments?
A). Optional parameters
B). Dynamic functions
C). Variable arguments
D). All of the above
Which PHP keyword is used to pass a function as an argument to another function?
A). Dynamic functions
B). Anonymous functions
C). Callbacks
D). All of the above
Which PHP feature allows defining functions with variable-length argument lists?
A). Dynamic functions
B). Variable arguments
C). Varargs
D). All of the above
What is the output of the following PHP code?<?php
function outer() {
function inner() {
echo 'Inner function';
}
}
inner();
?
A). Inner function
B). Function does not exist: inner
C). Undefined function: inner
D). Function inner() { echo 'Inner function'; }
Which PHP feature allows specifying default values for function arguments?
A). Default arguments
B). Optional parameters
C). Variable-length argument lists
D). All of the above
What is the significance of passing functions as arguments in PHP?
A). It allows functions to be called multiple times
B). It simplifies the function definition process
C). It enables dynamic function invocation and behavior
D). It prevents code duplication
Which keyword is used to define default parameter values in PHP functions?
A). default
B). var
C). const
D). None of the above
Which of the following statements about returning values from PHP functions is true?
A). PHP functions can return multiple values simultaneously
B). PHP functions cannot return values
C). PHP functions must always return a value
D). PHP functions can only return values of type string
Which PHP function is used to check if a function exists before calling it?
A). function_exists()
B). is_function()
C). function_defined()
D). None of the above