Headers already sent

Hello,

I was pretty sure I had ruled out all other possible causes but having same issue with another plugin I wanted to be on the safe side. Here’s what I’ve done :

1. Install a fresh WordPress 5.2.3
2. Install CBX Poll

By the way I have open the same thread for Contact Form 7 Multi-step forms: https://wordpress.org/support/topic/hea/

As I’ve previously managed to narrow it down to the WordPress schedule task system and their wp-cron.php file, I’ve quickly created a dummy plugin to register minutely task:

<?php
/**
 * Plugin Name: Cron Test
 */
function my_add_minutely( $schedules ) {
    // add a 'minutely' schedule to the existing set
    $schedules['minutely'] = array(
        'interval' => 60,
        'display' => __('Once Minutely')
    );
    return $schedules;
}
add_filter( 'cron_schedules', 'my_add_minutely' );

register_activation_hook(__FILE__, 'my_activation');

function my_activation() {
    if (! wp_next_scheduled ( 'my_minutely_event' )) {
        wp_schedule_event(time(), 'minutely', 'my_minutely_event');
    }
}

add_action('my_minutely_event', 'do_this_minutely');

function do_this_minutely() {
    // do something every minute
    error_log( 'My minutely event.' );
}

register_deactivation_hook(__FILE__, 'my_deactivation');

function my_deactivation() {
        wp_clear_scheduled_hook('my_minutely_event');
}

And now I do have the PHP warning repeatedly:
https://mega.nz/#!cvZEwChI!FPrpr9XTdrhMerRZ6KYKPYKEeYihyZQwWaghH8kJnCg

Regards,

Thank you for that and may the Force be with You.

Hi there,

Thank you for this new version.

It seems to fix the “header already sent” warning indeed.

Regards,