debugging problems with session errors in PHP programs _php tutorial

Development needs to touch PHP, feel very fast, in debugging PHP session is always wrong,

Warning:session_start (): Cannot send session cache Limiter-headers already sent (output started at xxx:2) in. php on Li NE 3

Similar to the wrong, compared with the source code as if they did not write wrong.

PHP start symbol

The session cannot have any character output before it starts,

Header () is the same

Put the code ahead, remove the preceding space, and you're ready.

-------------------correct

Session_Start ();
$username;
$username = "Test";
Session_register ("username");
Echo $_session[username];
?>

-------------------Error

Session_Start ();
$username;
$username = "Test";
Session_register ("username");
Echo $_session[username];
?>

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