php session_start() error cause analysis and solution_PHP tutorial

Error message: Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent

Cause: If there is output content before session_start(), an error will occur,

Solution: Add ob_start() before session_start();

index.php

Copy code The code is as follows:

error_reporting(-1);
ob_start();//If you don’t add it, an error will occur and the session cannot be written.
register_shutdown_function('close');


echo 1;
session_start();

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

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

index2.Php

Copy code The code is as follows:

error_reporting(-1) ;
ob_start();//If you don’t add it, an error will occur and the session cannot be read.
?
echo 1;
session_start();

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

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