Check if PHP session has already started -


i have php file called page has started session , page doesn't have session started. therefore when have session_start() on script error message "session started". i've put these lines:

if(!isset($_cookie["phpsessid"])) {   session_start(); }

but time got warning message:

notice: undefined variable: _session

is there better way check if session has started?

if use @session_start make things work , shut warnings?

recommended way versions of php >= 5.4.0

if (session_status() == php_session_none) {     session_start(); }

source: http://www.php.net/manual/en/function.session-status.php

for versions of php < 5.4.0

if(session_id() == '') {     session_start(); }

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