Which of the following statement about PHP is incorrect?

What is '?' ?

What is a class in PHP?

Which is incorrect way to take a PHP variable named $name and reassign it to a JavaScript variable var name?

Which options may be a reason for the error - 'Call to undefined function curl_init()'?

What is the output? '; $array1 = array( '1'=>'a', '2'=>'b', '3'=>'c' ); $array = array_flip($array1); print_r($array); echo ''; ?>

what is array_column?

Which is the correct abstract method?

print_r( 2 ) outputs:

Functions can be used to execute a shell command?

Correct usage of the chmod() function?