Call to undefined function str_contains() in wp-includes/load.php:1618

[lernerconsult]

WordPress 6.3 site with PHP 7.4

PHP Fatal error: Uncaught Error: Call to undefined function str_contains() in wp-includes/load.php:1618
It seems to be because of using str_contains, a PHP 8.0 function, on a PHP 7.4 site

https://core.trac.wordpress.org/browser/trunk/src/wp-includes/compat.php#L423 defines str_contains for pre-PHP8 sites.

"If" that PHP8 function is called before the "if ( ! function_exists( 'str_contains' ) ) { " statement is executed, the function is undefined.

​https://www.php.net/manual/en/functions.user-defined.php "Functions need not be defined before they are referenced, except when a function is conditionally defined".

[SergeyBiryukov]

Hi there, welcome to WordPress Trac! Thanks for the report.

The line number in the error message points to the wp_convert_hr_to_bytes() function. In all the scenarios I can think of, by the time this function runs, the polyfills from compat.php should already be loaded.

1. Could you provide the steps to reproduce the issue on a clean install?
2. Could you confirm that your wp-settings.php file has compat.php on line 34​?

[emmaedeh]

Thanks for the response @SergeyBiryukov

I am currently having this same issue, as I try to recover a backup of my WordPress site.
I have added "require ABSPATH . WPINC . '/compat.php';" in line 34 as you advised and it fixed that. But now I have this new error -> (Fatal error: Cannot redeclare _wp_can_use_pcre_u() (previously declared in /home/healqils/splitsecondsermons.com/wp-includes/compat.php:28) in /home/healqils/splitsecondsermons.com/wp-includes/compat.php on line 28)

Any Help?

Replying to SergeyBiryukov:

Hi there, welcome to WordPress Trac! Thanks for the report.

The line number in the error message points to the wp_convert_hr_to_bytes() function. In all the scenarios I can think of, by the time this function runs, the polyfills from compat.php should already be loaded.

1. Could you provide the steps to reproduce the issue on a clean install?
2. Could you confirm that your wp-settings.php file has compat.php on line 34​?

[SergeyBiryukov]

Replying to emmaedeh:

But now I have this new error -> (Fatal error: Cannot redeclare _wp_can_use_pcre_u() (previously declared in /home/healqils/splitsecondsermons.com/wp-includes/compat.php:28) in /home/healqils/splitsecondsermons.com/wp-includes/compat.php on line 28)

I'm sorry to hear you are having issues with your website. It looks like the error is caused by an incomplete upgrade.

It appears that the wp-settings.php file was not updated during the upgrade to 6.3, and the compat.php file is now loaded twice. It should be removed from line 107​ where it was previously included.

Please note that there were other changes to the wp-settings.php file in 6.3 as well, so I would recommend downloading the ​latest version of WordPress and replacing the file with a fresh copy, that should fix the issue.

[emmaedeh]

Thanks @SergeyBiryukov This was helpful.
It fixed the issue.

[ironprogrammer]

As this ticket has been open with unresolved reporter-feedback for over 3 months, I'm closing it for now.

Please feel free to reopen if the details requested in comment:1 can be addressed. Thanks!