Title: Warning: Cannot modify header
Last modified: June 22, 2018

---

# Warning: Cannot modify header

 *  [northof52](https://wordpress.org/support/users/northof52/)
 * (@northof52)
 * [7 years, 10 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-7/)
 * I’m getting multiple errors on the top of each website page that start with:
   
   Warning: Cannot modify header information – headers already sent by (output started
   at… I phoned Siteground, my host company, and they had the PHP set to version
   7.0 (which is optimal). The only way they were able to remove the errors was 
   to change it to PHP 5.6. I’ve done this as a temporary fix, but they said Cerber
   7.0 wasn’t compatible with the optimal PHP. I am running Cerber Version 7.0 and
   it’s up to date. The insight in a similar question from months ago did not help.
   Thanks.

The topic ‘Warning: Cannot modify header’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/wp-cerber_77a9bf.svg)
 * [WP Cerber Security, Anti-spam & Malware Scan](https://wordpress.org/plugins/wp-cerber/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-cerber/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-cerber/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-cerber/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-cerber/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-cerber/reviews/)

## Tags

 * [cannot modify header](https://wordpress.org/support/topic-tag/cannot-modify-header/)

 * 0 replies
 * 1 participant
 * Last reply from: [northof52](https://wordpress.org/support/users/northof52/)
 * Last activity: [7 years, 10 months ago](https://wordpress.org/support/topic/warning-cannot-modify-header-7/)
 * Status: not resolved