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 output of the following PHP code?<?php
function multiply(...$args) {
$result = 1;
foreach ($args as $value) {
$result *= $value;
}
return $result;
}
echo multiply(2, 3, 4);
?
A). 24
B). 9
C). 6
D). 2
Which of the following statements about returning values from PHP functions is true?
A). PHP functions can return multiple values simultaneously
B). PHP functions cannot return values
C). PHP functions must always return a value
D). PHP functions can only return values of type string
What will be the output of the following PHP code?<?php
function factorial($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 $result; }
Which PHP feature allows defining functions with a variable number of arguments?
A). Optional parameters
B). Dynamic functions
C). Variable arguments
D). All of the above
Which PHP feature allows defining functions within other functions?
A). Inner functions
B). Enclosed functions
C). Nested functions
D). All of the above
What will be the output of the following PHP code?<?php
function add($a, $b) {
return $a + $b;
}
$result = add(5, 3);
echo $result;
?
A). 8
B). add(5, 3)
C). function add($a, $b) { return $a + $b; }
D). $a + $b
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
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 PHP function is used to return a value from a function and terminate its execution?
A). return
B). exit
C). break
D). continue