php - Wordpress Ajax setcookie WAMP/LAMP disparities -

in wordpress themed-plugin e-commerce have 2 ajax/php scripts setting cookies (both in same directory) ajax calls set same "cart.js" first script sets/updates anonymous cart cookie when cart either created or updated. second checks if customer/user exists, or creates 1 anew , --in either case -- logs them in if not already, before cart gets passed paypal. such, upon returning paypal customer/user (now logged in) presented overview / review of status of orders (new , old).

on wamp develpment stack, works flawlessly, while on hosted (linux) installation cart_cookie script works expected, while checkout/customer_cookie throws...

[14-may-2013 02:08:50] php warning:  session_start()     [<a href='function.session-start'>function.session-start</a>]:         cannot send session cache limiter - headers sent             (output started @ /home2/alternam/public_html/demo/wp-content/themes/am_wallaby_kids/checkout.php:2)                 in /home2/alternam/public_html/demo/wp-content/plugins/cat-man/catalog-manager.php on line 23 

subsequently, user not logged in, , cart not converted (updated relevant customer data). wish saw way pare down minimum, have no earthly idea why 2 scripts behave differently across platforms i'll apologize in advance lengthy post , include them both in entirety below, , ask if can see obvious reason disparity? patience.

p.s. both wamp , lamp stacks running php 5.2

cart_add.php (works both wamp && lamp)

<?php ob_start(); require_once(preg_replace("/wp-content.*/","wp-load.php",__file__)); ob_end_clean(); $ud_cart = $product_name = $product_url = $reset = ""; $_post  = filter_input_array(input_post, filter_sanitize_string);# sanitize post input foreach ($_post $key => $val) {    if(!is_array($val)) $$key = html_entity_decode($val,ent_quotes);     else $$key = $val; } if($ud_cart) {    $reset =1;     $amt_cart[0] = $cart_id;     if(@$items) foreach($items $key => $item )$amt_cart[] = $item;     $amt_cart = serialize($amt_cart); }  if($reset) {    //    initiated cart (tpl_cart.php on page load) remove out-of-stock items     //    old carts -- items have gone out-of-stock since cart created -- or     //    update/remove cart items upon user request (user clicks update|remove)     if($amt_cart)     {    $amt_cart = stripslashes($amt_cart);         setcookie(amart_cart, $amt_cart, time()+60*60*24*90, cookiepath, cookie_domain);     }     exit; }  // create cart, , add, update, or remove cart-items within catalog gallery && product detail pages $add = array("product_id" => $product_id, "product_name" => $product_name, "product_type" => $product_type,"product_url" => $product_url,"qty" => $qty); $update = ""; if( isset( $_cookie[amart_cart] ) ) {    $amt_cart = stripslashes($_cookie[amart_cart]);     $amt_cart = unserialize($amt_cart);     foreach($amt_cart $key => $item)     {    if($key == 0 ) $amt_cart_id = $item;         else         {    foreach($item $attr => $value)             {    if($product_id != $value) continue;                 else                 {    $update = 1;                     if($qty == 0 )                     {    unset($amt_cart[$key]);                          break;                     } else     $amt_cart[$key]['qty'] = $qty;                 }             }         }     }     if(!$update) $amt_cart[] = $add;     setcookie(amart_cart,  serialize($amt_cart), time()+60*60*24*90, cookiepath, cookie_domain); } else {    unset($_session[store_id]['dest_zip'], $_session[store_id]['dest_ctry']);     $amt_cart[0] = uniqid(amart_cart);     $amt_cart[] = $add;     setcookie(amart_cart, serialize($amt_cart), time()+60*60*24*90, cookiepath, cookie_domain); } ?> 

checkout.php (works on wamp, fails on lamp)

    <?php // tpl cart posts via ajax call in cart.js ob_start(); require_once(preg_replace("/wp-content.*/","wp-load.php",__file__)); ob_end_clean();  $_post  = filter_input_array(input_post, filter_sanitize_string); global $current_user, $wpfx; $buyer_address1 = $buyer_address2 = $buyer_city = $buyer_region = $buyer_postal_code = $buyer_country = $buyer_ctry_code ="";  foreach ($_post $key => $val) $$key = $val; foreach($buyer $key => $val) $$key = $val;  $user_is_admin = current_user_can('manage_options'); if(!is_user_logged_in() || $user_is_admin ) {    if($userid = email_exists($email))     {    $user_info = $user_info = get_userdata($userid);         $user_login = $user_info->user_login;         $display_name = $user_info->display_name;         $welcome = "welcome $display_name!";     }     if(@$welcome)     {    if(!$user_is_admin )         {    if(!$user_cnfm) die($welcome);             $auth = get_object_vars(wp_authenticate($user_login, $user_pass));             if(array_key_exists('errors',$auth)) die("password error");             wp_set_auth_cookie( $userid, true);             wp_set_current_user($userid, $user_login);         }         update_user_meta( $userid, 'customer', 1);     }     else     {    $buyer_name = "$buyer_first $buyer_last";         $ship_to_name = "$first_name $last_name";         if($ship_to_self)         {    foreach ( $ctry_opts $key=>$value ) if (strcasecmp($country, $value) == 0) $buyer_country = $key;             $buyer_address1 = $address1;             $buyer_address2 = $address2;             $buyer_city = $city;             $buyer_region = $state;             $buyer_postal_code = $zip;             $buyer_ctry_code =strtolower($country);         }    else foreach ( $ctry_opts $key=>$value ) if ($buyer_ctry_code == $value) $buyer_country = $key;         $userdata = $user_cookie = array(             'user_login' => $email,             'user_email'=> $email,             'user_pass'=>$user_pass,             'first_name'=>$buyer_first,             'last_name'=>$buyer_last,             'display_name' =>$buyer_name,             'address1' => $buyer_address1,//null if not ship self             'address2' => $buyer_address2,//null if not ship self             'city' => $buyer_city,//google guess if not ship self             'region' => $buyer_region,//google guess if not ship self             'postal_code' => $buyer_postal_code,//null if not ship self             'country' => $buyer_country,//google guess if not ship self             'ctry_code' => $buyer_ctry_code,//google guess if not ship self             'customer' => '1'         );         $userid = wp_insert_user( $userdata );         if(!$user_is_admin)         {    wp_set_auth_cookie( $userid, true);             wp_set_current_user($userid, $email);         }         unset($user_cookie['user_login'],$user_cookie['user_pass'],$user_cookie['display_name']);         setcookie('amart_customer', serialize($user_cookie), time()+60*60*24*180, cookiepath, cookie_domain);     } } if(is_user_logged_in()) {    if(!$user_is_admin) $userid = $current_user->id;     $cart_id = $item_name;     $cart = $wpdb->get_row("select * {$wpfx}amt_carts cart_id = '$cart_id'", array_a);     if( $cart['host_checkout'] && isset($store_options->paypal_live) && $store_options->paypal_live !=='false')         $host_checkout = true;     $ship_to = serialize( array('first_name' => $first_name,'last_name' => $last_name,'address1' => $address1,'address2' => $address2,'city' => $city,    'state' => $state,'postal_code' => $zip,'country' =>$country));     $attributes = array('ship_to' => $ship_to, 'customer_id'=>$userid, 'checkout_date'=>$now);     $where = array('cart_id' => $cart_id);     $wpdb->update("{$wpfx}amt_carts", $attributes,$where); } ?> 

this is, believe, due difference in php configuration. cannot tell more without knowing full list of post variables, besides broad guidelines.

this assume causing issue:

1. you're assigning $_post[key] $key. fine
2. you're looping through $buyers. if $_post["buyers"] not set or not array, throw notice.
3. a notice echo. not in output buffering context, therefore causes headers sent. if headers sent , later send cookie or other header info, warning getting.

one of dev environments has error_reporting set e_none. check in php information. if set e_none, code work. if not, message. consider always checking existence , correct type of functions. way concisely follows:

foreach (((array)$buyers) $v) { 

if $buyers undefined, empty array. if buyers had 1 element have array 1 element. otherwise, array had.