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php,php notice,php Notice: A session had already been starte解决办法 

Notice: A session had already been started – ignoring session_start() in .. on line ..

This happens when you try to start session more than once.

The solution for above problem is

1) in php.ini file set session.autostart to 0

session.auto_start = 0

2) In your code use this line

if (!session_id()) session_start();

代替

session_start();