function 4You() { }

function _4You() { }

function object() { }

$1 = "Hello";

$_1 = "Hello World";

$_SERVER

$_ENV

$_POST

$_FILES

$_GET

There is no difference.

Print has a return value, echo does not

Echo has a return value, print does not

Print buffers the output, while echo does not

None of the above

1

3

5

20

7

1

3

2

4

-1