This evening I posted beta-1 of Email Users v4.7.0. This build addresses, or at least recognizes, an issue recently reported in the WordPress Support forum where email was not being sent when a large number of users were being selected.
The crux of this problem is the PHP max_input_vars configuration setting which by default, is set to 1000.
Every user selected on the form plus the other form fields are submitted as “input vars”. If ~990 or more users were selected, the input vars would be exhausted and the form submit would be missing required fields. The result was no email sent and the form being redisplayed for the user.
While I can’t change the setting of PHP’s max_input_vars setting, I can detect when the scenario, I can detect when it might be a problem and warn the user.
The warning shown above will now be displayed whenever the number of users which could be selected approaches or exceeds the current setting of max_input_vars.
Hopefully this will alleviate the confusion around this issue. Please report back on any bugs or odd behavior.Email Users Beta (1021 downloads)