How to use session in wordpress in plugin development

Question

I am new to write a plugin ..I am having a testplugin.php file and a ajax.php file ..

My code in testplugin.php is

global $session;  print_r($abc); //$abc is array of my data ..  $session['arrayImg']=$abc; //saving data in session   echo  $session['arrayImg']; //displayin "Array" 

And my ajax.php consists of following code

global $session;  $abc = $session['arrayImg'];  print_r ("abs== ".$abc); //displayin "abs== Array" 

And if use session_start();

I get following error

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

I just want to send array of data from one file of my plugin to another file ...

Answer 1

Add following on your plugin or themes functions.php file

function wpse16119876_init_session() {     if ( ! session_id() ) {         session_start();     } } // Start session on init hook. add_action( 'init', 'wpse16119876_init_session' ); 

Next, to add data in SESSION -

// If session has started, this data will be stored. $_SESSION['arrayImg'] = $abc; 

To get the data on ajax hooked function -

// handle the ajax request function wpse16119876_handle_ajax_request() {     if ( ! session_id() ) {         session_start();     }      if ( array_key_exists( 'arrayImg', $_SESSION ) ) {         $abc = $_SESSION['arrayImg'];     } else {         $abc = 'NOT IN SESSION DATA';     }      // Do something with $abc }