How to show a notice to plugin update

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I would like to show an admin notice (https://codex.wordpress.org/Plugin_API/Action_Reference/admin_notices) when my plugin has a update.

Like this:

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How to do this?

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  1. Assuming that your plugin is in the WordPress repository, then you can do this by hooking into the WordPress update functionality. Note that get_site_transient() is always used by falls back to the get_option() when it is not a multisite install..

    // Your plugin file
$plugin = 'plugin-dir/plugin-file.php';

// Check for Plugin updates, if you want to (not recommended for all pages)
// wp_update_plugins();

// Results of the update check
$update_plugins = get_site_transient( 'update_plugins' );
if ( isset( $update_plugins->response[ $plugin ] ) ) {
    // Your plugin needs an update
}

    In the result of update_plugins the $update_plugins->response is an array() that will be something like this:

    'response' => 
  array (
    'plugin-dir/plugin-file.php' => 
    stdClass::__set_state(array(
       'id' => '12345',
       'slug' => 'plugin-file',
       'plugin' => 'plugin-dir/plugin-file.php',
       'new_version' => '1.2.3',
       'url' => 'https://wordpress.org/plugins/plugin-dir/',
       'package' => 'https://downloads.wordpress.org/plugin/plugin-dir.1.2.3.zip',
    )),
),