如何使用session/function或javascript将变量从插件PHP传递到wordpress中的另一个PHP - how to pass variable from plugin php to another php file in wordpress using session/function or javascript?

how to pass variable from plugin php to another php file in wordpress using session/function or javascript?

我有一个插件文件testplugin.php.它包含变量$abc;

主要plugin.php

if(!is_admin()){
new Funtion_Button();
}
class Function_Button
{
if(is_single() || is_page() || is_home() ){  
      global $post; 
      global $wpdb; 
 $query_images_args = array(
     'post_type' => 'attachment' , 'post_mime_type' =>'image','post_status' => 'published', 'posts_per_page' => -1,'numberposts' => 1
$query_images = new WP_Query( $query_images_args );
         $images = array();
         foreach ( $query_images->posts as $image) {
         $images[]= wp_get_attachment_url( $image->ID );
         }
                 $abc[]=0;
         $abc= $abc.http_build_query($images);
                 $_SESSION['arrayImg']=$abc;
 );
}

///

收到文件

include ('testplugin.php'); 
session_start();
$array1[]=$abc;

现在这个$abc来自主插件页

但是我得到这个错误

致命错误:调用未定义函数is_admin()在C:'wamp'www'wordpress'wp-content'plugins'testplugin.php第98行

在第98行我有 if(!is_admin()){

Using session:

在testplugin.php

session_start();
$_SESSION['varname'] = $var_value;

//在另一个文件

session_start();
$var_value = $_SESSION['varname'];

使用cookies:

在testplugin.php

$_COOKIE['varname'] = $var_value;

//第2页

$var_value = $_COOKIE['varname'];