PHP程式中使用session錯誤調試問題_PHP教程

開發需要接觸PHP,感覺上手也挺快,在調試PHP中的SESSION時總是出錯,

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at XXX:2) in .php on line 3

類似錯,對照源碼好像自己沒有哪裡寫錯.

php開始符號

session在開始前不能有任何字元輸出,

header()是一樣的

將代碼提前,去除前面的空格,就可以了.

-------------------正確

session_start();
$username;
$username = "test";
session_register("username");
echo $_SESSION[username];
?>

-------------------錯誤

session_start();
$username;
$username = "test";
session_register("username");
echo $_SESSION[username];
?>

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