Answer & Solution
Hello, World! because the function_exists() function checks if the function greet() exists before calling it. Since the function does exist, it is called and echoes 'Hello, World!'.
}
if (function_exists('greet')) {
greet();
} else {
echo "Function does not exist";
}
?> | PHP | MYTAT">
}
if (function_exists('greet')) {
greet();
} else {
echo "Function does not exist";
}
?> | PHP | MYTAT">
<?php
function greet() {
echo 'Hello, World!';
}
if (function_exists('greet')) {
greet();
} else {
echo 'Function does not exist';
}
?>
Hello, World! because the function_exists() function checks if the function greet() exists before calling it. Since the function does exist, it is called and echoes 'Hello, World!'.
Which PHP keyword is used to declare a variable-length argument list in a function?
A). vararg
B). args
C). params
D). ...$args
Which PHP feature allows passing a function as an argument to another function?
A). Dynamic functions
B). Global functions
C). Static functions
D). Callbacks
Which PHP feature allows defining functions without specifying their names?
A). Anonymous functions
B). Dynamic functions
C). Global functions
D). Static functions
What keyword is used to define a function in PHP?
A). define
B). function
C). declare
D). method
What will be the output of the following PHP code?<?php
function add($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 + $b
What is the significance of passing functions as arguments in PHP?
A). It allows functions to be called multiple times
B). It simplifies the function definition process
C). It enables dynamic function invocation and behavior
D). It prevents code duplication
Which PHP keyword is used to check if a function exists before calling it?
A). check_function()
B). function_exists()
C). function_check()
D). exists_function()
What will be the output of the following PHP code?<?php
function uppercase($str) {
return strtoupper($str);
}
echo uppercase('hello');
?>
A). HELLO
B). hello
C). Uppercase
D). Undefined function: uppercase
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, $name!';
}
D). John
Which of the following statements is true about function names in PHP?
A). Function names are case-sensitive
B). Function names must start with a dollar sign ($)
C). Function names cannot contain numbers
D). Function names can contain spaces