Title: Intermittent PHP warnings
Last modified: February 10, 2020

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# Intermittent PHP warnings

 *  [chargeup](https://wordpress.org/support/users/chargeup/)
 * (@chargeup)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/intermittent-php-warnings/)
 * I have been receiving intermittent PHP warning on basically all of my websites
   regardless of where they are hosted, the theme, plugins, PHP version, etc. They
   also all tend to show up around the exact same time on the same days.
 * Here is the error I receive on every website:
 * [02-Feb-2020 08:09:01 UTC] PHP Warning: urldecode() expects parameter 1 to be
   string, array given in /home/…/public_html/wp-includes/class-wp-query.php on 
   line 2203
 * [02-Feb-2020 08:09:01 UTC] PHP Warning: preg_match() expects parameter 2 to be
   string, array given in /home/…/public_html/wp-includes/canonical.php on line 
   231

Viewing 1 replies (of 1 total)

 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [6 years, 3 months ago](https://wordpress.org/support/topic/intermittent-php-warnings/#post-12424138)
 * Intermittent warnings are difficult to resolve unless you can find a reliable
   way to induce the problem. Additionally, knowing where the warning finally occurred
   isn’t that helpful, we need to determine the source of the non-string data. To
   do so requires replacing the default error handler with one that utilizes `debug_backtrace()`
   to log the function calls leading up to the point when PHP finally realized something
   is wrong. One of those functions is likely the actual source of the problem. 
   For examples see
    [https://stackoverflow.com/questions/1159216/how-can-i-get-php-to-produce-a-backtrace-upon-errors](https://stackoverflow.com/questions/1159216/how-can-i-get-php-to-produce-a-backtrace-upon-errors)
 * If you use any of the proffered code, replace any `echo` statements with `error_log()`
   for output to be logged instead of sent to the browser. It’s not a literal search
   and replace. `echo` statement syntax is not the same as `error_log()` function
   syntax. For example:
 *     ```
       echo "Hello world.";
       error_log("Hello world.");
       ```
   
 * Even this will not tell us the source of non-string data, it only narrows down
   where to look.

Viewing 1 replies (of 1 total)

The topic ‘Intermittent PHP warnings’ is closed to new replies.

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 1 reply
 * 2 participants
 * Last reply from: [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * Last activity: [6 years, 3 months ago](https://wordpress.org/support/topic/intermittent-php-warnings/#post-12424138)
 * Status: not resolved

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