PHP7升级致WordPress Taxonomy Order插件失效，求解决方案

Hey there, let's get that PHP warning sorted out. The issue here is that PHP 7.2 and later enforces stricter rules for the count() function — it only accepts arrays or objects that implement the Countable interface. The old Taxonomy Order plugin's code on line 280 is passing a non-countable value (like null or a scalar) into count(), which triggers the warning.

Here's how to fix it step by step:

• First, locate the taxonomy-order.php file in your plugins directory, then jump to line 280. You'll likely see a line that looks something like this:

  $term_count = count($some_variable);
  

  (The variable name might be different, like $terms or $items — focus on the count() call here.)

• Replace that line with a conditional check to ensure we only call count() on countable values. If your server runs PHP 7.3 or newer, use the is_countable() function for cleaner code:

  $term_count = is_countable($some_variable) ? count($some_variable) : 0;
  

• If you're stuck on an older PHP version (pre-7.3), use this more compatible check that verifies the value is either an array or a Countable object:

  $term_count = (is_array($some_variable) || $some_variable instanceof Countable) ? count($some_variable) : 0;
  

• Save the file, then refresh your site to confirm the warning is gone.

A quick note: Always make a backup of the plugin file before modifying it — just in case you need to revert changes later. Since the plugin is discontinued, you don't have to worry about updates overwriting your fix.

内容的提问来源于stack exchange，提问作者lukehillonline