glouton

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,

Hello,

Thank you for getting back to me promptly.

I was pretty sure I had ruled out all other possible causes but to be on the safe side here’s what I’ve done :

1. Install a fresh WordPress 5.2.3
2. Install CF7
3. Install CF7 Multi-Step

On this brand new installation I didn’t have any error.
Then after installing and activating CBX Poll it came back once. By the way I have open the same thread on their side: https://wordpress.org/support/topic/headers-already-sent-39/

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/#!FzwzyYQa!Q_tHIjQJuV5Tdt1m_gXoJE_u9RO1nhKgPD5iBL92_vQ

Regards,