Which PHP feature allows specifying default values for function arguments?

Which PHP feature allows defining functions within other functions?

A). Inner functions

B). Enclosed functions

C). Nested functions

D). All of the above

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

What will be the output of the following PHP code?
<?php
function greet($name = 'Guest') {
return 'Hello, $name!';
}
echo greet('Alice');
?

A). Hello, Guest!

B). Hello, Alice!

C). Hello, $name!

D). Function call will result in an error

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 keyword is used to define functions without specifying their names?

A). Dynamic functions

B). Anonymous functions

C). Inner functions

D). Nested functions

What is the purpose of passing arguments to a function in PHP?

A). To specify the return value of the function

B). To allow the function to accept input data

C). To define the function name

D). To terminate the execution of the function

What is the output of the following PHP code?
<?php
function multiply(...$args) {
$result = 1;
foreach ($args as $value) {
$result *= $value;
}
return $result;
}
echo multiply(2, 3, 4);
?

A). 24

B). 9

C). 6

D). 2