wp_dropdown_users() memory exhausted for large user tables

[trek7k]

wp_dropdown_users() is used in many places throughout the admin, like /wp-admin/users.php where it's called for reassigning a deleted user's posts.

This function quickly exhausts memory (not to mention, browsers have trouble rendering such a large menu, and usability is impossible) for big user tables (400,000+ users, tested).

PHP Fatal error:  Allowed memory size of 536870912 bytes exhausted (tried to allocate 19398624 bytes) in /var/app/current/wp-includes/user.php on line 1202

Instead of using an html select menu, a typeahead text box that queries the user database could be much more efficient and would solve the problem.

I'm classifying this as a bug and not an enhancement because for large sites, it is currently impossible to delete users as the script will often run out of memory at "Attribute all content to:".

[SergeyBiryukov]

Hi there, welcome to WordPress Trac!

Thanks for the report, we're already tracking this issue in #19867.

[trek7k]

Thanks Sergey, glad to hear it!