关于一个问题; 在PHP中

Question

exit()

is valid,but

exit()
echo 1;

Will fail.

Why?

Answer 1

分号可以终止一条语句，尽管如果是最后一条语句则不需要。

Answer 2

The first is correct syntax , the later isn't. If more than one command is provided, they have to be separated via ; . echo 1 wouldn't be executed anyway.

Answer 3

This:

exit()

will work only if it is at the end

But

exit()
echo 1;

In this case it is not on the end.