<?php
function multiply(...$args) {
$result = 1;
foreach ($args as $value) {
$result *= $value;
}
return $result;
}
echo multiply(2, 3, 4);
?
Which PHP feature allows specifying default values for function arguments?
A). Default arguments
B). Optional parameters
C). Variable-length argument lists
D). All of the above
What will be the output of the following PHP code?<?php
function factorial($n) {
$result = 1;
for ($i = 1; $i <= $n; $i++) {
$result *= $i;
}
return $result;
}
echo factorial(5);
?
A). 120
B). 5
C). Undefined function: factorial
D). Function factorial($n) { $result = 1; for ($i = 1; $i <= $n; $i++) { $result *= $i; } return $result; }
Which of the following statements about returning values from PHP functions is true?
A). PHP functions can return multiple values simultaneously
B). PHP functions cannot return values
C). PHP functions must always return a value
D). PHP functions can only return values of type string
What is the purpose of passing arguments to a function in PHP?
A). To specify the return value of the function
B). To allow the function to accept input data
C). To define the function name
D). To terminate the execution of the function
Which PHP function is used to check if a function exists before calling it?
A). function_exists()
B). is_function()
C). function_defined()
D). None of the above
What is the purpose of the return statement in PHP functions?
A). To output a value from the function and terminate its execution
B). To specify the return type of the function
C). To declare a variable within the function
D). To terminate the function execution
What will be the output of the following PHP code?<?php
function greet($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
What will be the output of the following PHP code?<?php
function greet() {
echo 'Hello, World!';
}
if (function_exists('greet')) {
greet();
} else {
echo 'Function does not exist';
}
?
A). Hello, World!
B). Function does not exist
C). Undefined function: greet
D). Function greet() { echo 'Hello, World!'; }
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'; }