PHP Notice: Only variables should be passed by reference

[mikeyarce]

Expected/Desired Behavior

No PHP Notices.

Actual Behavior

PHP Notice:

[07-Jun-2021 18:36:16 UTC] PHP Notice:  Only variables should be passed by reference in wp-content/plugins/Edit-Flow/common/php/screen-options.php on line 169

component: "Plugin: Edit-Flow"
file: "wp-content/plugins/Edit-Flow/common/php/screen-options.php"
key: "b70f237b117c737f6e624ed611138805"
line: 169
message: "Only variables should be passed by reference"
stack: Array(2)
0: "wsScreenOptions10->ajax_save_callback()"
1: "do_action('wp_ajax_save_settings-ef_story_budget_screen_columns')"
length: 2
__proto__: Array(0)
type: "notice"
__proto__: Object

How does the plugin/feature/module currently work.

Steps to Reproduce the Problem

1. Go to Dashboard > Story Budget
2. From the top click Screen
3. Change "Number of Columns" to something else

(Optional) Additional notes

The problem comes from: https://github.com/Automattic/Edit-Flow/blob/master/common/php/screen-options.php#L169

I think this:
$id = end(explode('-', $_POST['action'], 2));

Should be split into two lines:

$ids = explode('-', $_POST['action'], 2);
$id = end($ids);