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 feature allows defining functions without specifying their names?
A). Anonymous functions
B). Dynamic functions
C). Global functions
D). Static functions
Which PHP keyword is used to check if a function exists before calling it?
A). check_function()
B). function_exists()
C). function_check()
D). exists_function()
How do you define parameters in a PHP function?
A). Parameters are defined within parentheses after the function name
B). Parameters are defined using the keyword 'param'
C). Parameters are defined using curly braces {}
D). Parameters are defined using square brackets []
Which of the following statements about return types in PHP functions is true?
A). PHP functions must always have a return type
B). PHP functions can have a return type specified using the 'returns' keyword
C). PHP functions can have a return type specified using the 'return' keyword
D). PHP functions can have a return type declared using type declarations
What is the output of the following PHP code?<?php
$num = 10;
function testScope() {
global $num;
echo $num;
}
testScope();
?>
A). 10
B). 0
C). Undefined variable: num
D). Variable $num cannot be accessed outside the function
What keyword is used to define a function in PHP?
A). define
B). function
C). declare
D). method
Which PHP keyword is used to declare a variable-length argument list in a function?
A). vararg
B). args
C). params
D). ...$args
Which of the following statements about variable scope in PHP functions is true?
A). Variables defined inside a function have global scope
B). Variables defined outside a function have local scope
C). Variables defined inside a function have local scope
D). Variables defined outside a function have global scope
What is 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!'; }