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 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
Which PHP function is used to return a value from a function and terminate its execution?
A). return
B). exit
C). break
D). continue
What will be the output of the following PHP code?<?php
$greet = function($name) {
return 'Hello, $name!';
};
echo $greet('John');
?
A). Hello, John!
B). Hello, $name!
C). function($name) { return 'Hello, $name!'; }
D). John
What will be the output of the following PHP code?<?php
function greet() {
echo 'Hello, World!';
}
if (function_exists('greet')) {
greet();
} else {
echo 'Function does not exist';
}
?
A). Hello, World!
B). Function does not exist
C). Undefined function: greet
D). Function greet() { echo 'Hello, World!'; }
What is the output of the following PHP code?<?php
function uppercase($str) {
return strtoupper($str);
}
echo uppercase('hello');
?
A). HELLO
B). hello
C). Uppercase
D). Undefined function: uppercase
Which PHP feature allows defining functions with variable-length argument lists?
A). Dynamic functions
B). Variable arguments
C). Varargs
D). All of the above
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