Title: FunctionsPHP error
Last modified: March 7, 2024

---

# FunctionsPHP error

 *  [angelinaarabella](https://wordpress.org/support/users/angelinaarabella/)
 * (@angelinaarabella)
 * [2 years, 3 months ago](https://wordpress.org/support/topic/functionsphp-error-16/)
 *     ```wp-block-code
       Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 7241
   
       Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 2187
   
       Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 7241
   
       Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 2187
   
       Deprecated: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 7241
   
       Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /home4/xoxoang/public_html/wp-includes/functions.php on line 2187
   
       Warning: Cannot modify header information - headers already sent by (output started at /home4/xoxoang/public_html/wp-includes/functions.php:7241) in /home4/xoxoang/public_html/wp-admin/includes/misc.php on line 1431
   
       Warning: Cannot modify header information - headers already sent by (output started at /home4/xoxoang/public_html/wp-includes/functions.php:7241) in /home4/xoxoang/public_html/wp-includes/functions.php on line 7049
   
       Deprecated: str_replace(): Passing null to parameter #1 ($search) of type array|string is deprecated in /home4/xoxoang/public_html/wp-content/mu-plugins/endurance-page-cache.php on line 862
   
       Deprecated: str_replace(): Passing null to parameter #1 ($search) of type array|string is deprecated in /home4/xoxoang/public_html/wp-content/mu-plugins/endurance-page-cache.php on line 862
   
       Warning: Cannot modify header information - headers already sent by (output started at /home4/xoxoang/public_html/wp-includes/functions.php:7241) in /home4/xoxoang/public_html/wp-admin/admin-header.php on line 9
   
       Warning: Cannot modify header information - headers already sent by (output started at /home4/xoxoang/public_html/wp-includes/functions.php:7241) in /home4/xoxoang/public_html/wp-includes/option.php on line 1478
   
       Warning: Cannot modify header information - headers already sent by (output started at /home4/xoxoang/public_html/wp-includes/functions.php:7241) in /home4/xoxoang/public_html/wp-includes/option.php on line 1479
       ```
   
 * When I logged into my websites backend, I noticed it said this. I thought maybe
   it had something to do with the theme so I deactivated it and switched it to 
   something else but that didn’t change anything. I am not all that smart with 
   these kinds of things. The only thing I can think of is that I added a line to
   the end of my functionsphp file in order to remove the “additional info” tab 
   on my products which worked perfectly fine for a while now. I decided I would
   go back in and delete what I added, but it was already gone, like it erased itself
   back to its original state. Weird, but maybe that info is relevant to my issue?
   If anyone could help me I am also willing to compensate. Worse case I just redo
   my entire site from scratch and start over, which I don’t want to have to do –
   but I will. Thanks a bunch.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffunctionsphp-error-16%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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

 *  Moderator [t-p](https://wordpress.org/support/users/t-p/)
 * (@t-p)
 * [2 years, 3 months ago](https://wordpress.org/support/topic/functionsphp-error-16/#post-17482915)
 * >  I thought maybe it had something to do with the theme so I deactivated it 
   > and switched it to something else but that didn’t change anything.
 * This may be a plugin or theme conflict. Please attempt to disable all plugins,
   and use one of the default (Twenty*) themes. If the problem goes away, enable
   them one by one to identify the source of your troubles.
 *  [brit77](https://wordpress.org/support/users/brit77/)
 * (@brit77)
 * [2 years, 1 month ago](https://wordpress.org/support/topic/functionsphp-error-16/#post-17680810)
 * [@angelinaarabella](https://wordpress.org/support/users/angelinaarabella/), I
   had the exact same deprecated notices on my site. Turns out it was due to the
   plugin _Related Posts for WordPress_. Once I deactivated the plugin, the notices
   stopped appearing. Hope this helps! I’ll reach out to the plugin support to see
   if they can fix this.

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

The topic ‘FunctionsPHP error’ is closed to new replies.

## Tags

 * [admin.php](https://wordpress.org/support/topic-tag/admin-php/)
 * [mu-plugins](https://wordpress.org/support/topic-tag/mu-plugins/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 2 replies
 * 3 participants
 * Last reply from: [brit77](https://wordpress.org/support/users/brit77/)
 * Last activity: [2 years, 1 month ago](https://wordpress.org/support/topic/functionsphp-error-16/#post-17680810)
 * Status: not resolved

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