Title: PHP Warning: Cannot modify header information
Last modified: January 4, 2023

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# PHP Warning: Cannot modify header information

 *  Resolved [Darius Ju](https://wordpress.org/support/users/dariusju/)
 * (@dariusju)
 * [3 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-22/)
 * warning flood in logs.
 * [https://prnt.sc/KXpLnAIDchWb](https://prnt.sc/KXpLnAIDchWb)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [Morshed Alam](https://wordpress.org/support/users/sumon1068/)
 * (@sumon1068)
 * [3 years, 4 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-22/#post-16347389)
 * I’m also getting this error:
 * **PHP Warning: Cannot modify header information – headers already sent in …plugins/
   litespeed-cache/src/vary.cls.php on line 735**
 * Please take a look.
 *  [usabe](https://wordpress.org/support/users/usabe/)
 * (@usabe)
 * [3 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-22/#post-16419560)
 * Hi all
 * Due to inactivity of this topic and the continuous lscwp updates, I will mark
   this topic as “resolved”. If you still have such issues, please feel free to 
   open a ticket with further information by emailing to [support@litespeedtech.com](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-22/support@litespeedtech.com?output_format=md).
   Remember to reference this topic and ask to assign your ticket to Abe. I will
   check into this further from there.

Viewing 2 replies - 1 through 2 (of 2 total)

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

 * ![](https://ps.w.org/litespeed-cache/assets/icon-256x256.png?rev=2554181)
 * [LiteSpeed Cache](https://wordpress.org/plugins/litespeed-cache/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/litespeed-cache/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/litespeed-cache/)
 * [Active Topics](https://wordpress.org/support/plugin/litespeed-cache/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/litespeed-cache/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/litespeed-cache/reviews/)

 * 2 replies
 * 3 participants
 * Last reply from: [usabe](https://wordpress.org/support/users/usabe/)
 * Last activity: [3 years, 3 months ago](https://wordpress.org/support/topic/php-warning-cannot-modify-header-information-22/#post-16419560)
 * Status: resolved