PHP Warning: Cannot modify header information – headers already sent

[AITpro Admin]

Email Question:

i’m getting these constant php errors. how do i fix them.

[02-Feb-2022 02:09:55 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-admin/admin-header.php on line 9
[02-Feb-2022 02:57:22 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/pluggable.php on line 1355
[02-Feb-2022 02:57:22 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/pluggable.php on line 1358
[02-Feb-2022 04:02:40 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/pluggable.php on line 1355
[02-Feb-2022 04:02:40 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/pluggable.php on line 1358
[02-Feb-2022 04:03:09 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-login.php on line 462
[02-Feb-2022 04:03:09 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-login.php on line 478
[02-Feb-2022 04:03:09 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/functions.php on line 6821
[02-Feb-2022 04:03:09 UTC] PHP Warning:  Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/thelair/wp-includes/functions.php:5212) in /home/xxxxx/public_html/thelair/wp-includes/pluggable.php on line 1046

[AITpro Admin]

Answer:

These PHP errors were being caused by this code in the wp-config.php file:  define( 'ALTERNATE_WP_CRON', true );

This code is known to be problematic.  If you are running into problems with standard WP Crons then setup a Direct Cron job in your web host control panel.  The correct cron interval is 1 minute.  Any other cron interval time interval is incorrect and will cause problems for Plugins and Themes that run Cron jobs.  After setting up a Direct Cron job add this code in your wp-config.php file: define( 'DISABLE_WP_CRON', true );

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