Is this anything to be concerned about? I tried to research the error messages but didn’t find much of an explanation.
The site seems to be working perfectly fine. It is a WooCommerce site, btw, which makes me more concerned that I’ll put this into production this way and find out the errors in fact are cause for concern.
Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home2/my-site-name/public_html/wp-includes/functions.php on line 7288
Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /home2/my-site-name/public_html/wp-includes/functions.php on line 2187
Warning: Cannot modify header information – headers already sent by (output started at /home2/my-site-name/public_html/wp-includes/functions.php:7288) in /home2/my-site-name/public_html/wp-admin/includes/misc.php on line 1439
Warning: Cannot modify header information – headers already sent by (output started at /home2/my-site-name/public_html/wp-includes/functions.php:7288) in /home2/my-site-name/public_html/wp-includes/functions.php on line 7096
Warning: Cannot modify header information – headers already sent by (output started at /home2/my-site-name/public_html/wp-includes/functions.php:7288) in /home2/my-site-name/public_html/wp-admin/admin-header.php on line 9
I **think** the first 2 are nothing to worry about, but the last 3 “Warning: Cannot modify header information” seem more mysterious and not good.
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The first 2 warnings being output cause the other 3. Simply disable WP_DEBUG or at least WP_DEBUG_DISPLAY.