Countable Error in meta.php

[mattgates]

Warning: count(): Parameter must be an array or an object that implements Countable in wp-includes/meta.php on line 210

This error prevents any posts from being updated. It seems it is erroring because $old_value may not always be an array.

This is the original line that causes errors:

if ( count( $old_value ) == 1 ) {

The fix checks to see if $old_value is an object or array:

if ( (is_array($old_value) || is_object($old_value)) && count( $old_value ) == 1 ) {

After fix is implemented, everything seems to work fine.

[dkarfa]

Patch

[SergeyBiryukov]

We could use the is_countable() polyfill added in #43583.

[dkarfa]

I think is_countable() function added in PHP 7.3

[dkarfa]

Code refactoring

[mattgates]

is_countable works best and takes care of the two codes. Appreciate the update! Hopefully see it in the core! Every time WordPress gets an update, i have to add this code in there for PHP 7.3.

[mukesh27]

Added is_countable function for PHP 7.3

[mukesh27]

Added is_countable function for PHP 7.3

[ocean90]

Duplicate of #46660.

[dkarfa]

Hey @mattgates
is_countable is available in WP core from 4.9.6 ​https://developer.wordpress.org/reference/since/4.9.6/ but my point was that if you using any PHP lower version i.e. 7.2 or 5.6 then you will get Fatal error