php session_start()出錯原因分析及解決方案_PHP教程

錯誤提示： Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

原因：在session_start()之前如果有輸出內容，會出錯，

解決辦法：在session_start()之前加上ob_start();

index.php
複製代碼 代碼如下:
error_reporting(-1);
ob_start();//不加會出錯，無法寫入session
register_shutdown_function('close');


echo 1;
session_start();

$_SESSION['password']='mima2ddddddddddddddda2';

function close()
{
if(session_id()!=='')
@session_write_close();
}
?>
index2

index2.Php
複製代碼 代碼如下:
error_reporting(-1);
ob_start();//不加會出錯，無法讀取session
?
echo 1;
session_start();

echo $_SESSION['password'];
var_dump($_SESSION);
?>
index

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