php - How to return a ajax error? -

i want show ajax error after submitting form. ends 'die' best way handle this? write in php file in 'script' tags?

if($_post['postform'] == 'newsletter'){      $newslettersubscriber = new newslettersubscriber();     $newslettersubscriber->set('cms_newsletters_id', 2);     $newslettersubscriber->set('created', date('y-m-d h:i:s'));     $newslettersubscriber->set('firstname', $_post['voornaam']);     $newslettersubscriber->set('lastname', $_post['achternaam']);     $newslettersubscriber->set('companyname', $_post['beddrijfsnaam']);     $newslettersubscriber->set('emailaddress', $_post['email']);     $newslettersubscriber->set('subscribed', 1);     $saved = $newslettersubscriber->save();      die('subscriber added'); } 

i tried several solutions found can't work.

thanks!

all need create array , place parameters want pass array, use json_encode() turn json string can processed javascript

if($_post['postform'] == 'newsletter'){      $newslettersubscriber = new newslettersubscriber();     $newslettersubscriber->set('cms_newsletters_id', 2);     $newslettersubscriber->set('created', date('y-m-d h:i:s'));     $newslettersubscriber->set('firstname', $_post['voornaam']);     $newslettersubscriber->set('lastname', $_post['achternaam']);     $newslettersubscriber->set('companyname', $_post['beddrijfsnaam']);     $newslettersubscriber->set('emailaddress', $_post['email']);     $newslettersubscriber->set('subscribed', 1);     $saved = $newslettersubscriber->save();      $response = array('error_code'=>0,                        'message'=>'subscriber added'                      );     echo json_encode($response);     exit; } 

the javascript woudl like

$.ajax({     type: "post",     url: "connection.php",     data: {param1: 'aaa'},     datatype: json }) .done( function(data){     if(data.error_code == 0) {        alert(data.message);     } }); 

note when use datatype:json browser automatically converts json string returned javascript object can address data.error_code , data.message in simple javascript object notation