Which PHP function is used to check if a function exists before calling it?

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 keyword is used to define default parameter values in PHP functions?

A). default

B). var

C). const

D). None of the above

Which PHP feature allows defining functions within other functions?

A). Inner functions

B). Enclosed functions

C). Nested functions

D). All of the above

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 keyword is used to define functions without specifying their names?

A). Dynamic functions

B). Anonymous functions

C). Inner functions

D). Nested functions

What will be the output of the following PHP code?
<?php
function sum($a, $b = 5) {
return $a + $b;
}
echo sum(3);
?

A). 3

B). 8

C). 5

D). Function call will result in an error

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 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 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; }