PHP（2）__error notes

1、If you want to display user's IP address:

?php
print "Hi! Your IP address is: $_SERVER['REMOTE_ADDR']";
?>
will be error tips like this:
parse error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_STRING.
You should delete ''change your code like this:
?php
print "Hi! Your IP address is: $_SERVER[REMOTE_ADDR]";
?>

Note: PHP的超级全局变量有：$_SERVER, $_GET, $$_POST, $_COOKIE, $_FILES, $_ENV, $_REQUEST, $_SESSION, $GLOBALS。
其中$GLOBALS是超级全局变量的超级，可以用如下代码查看$GLOBALS中的所有变量：

?php
print '';
print_r($GLOBALS);
PRINT '';
?>