WordPress提示define()不区分大小写常量声明弃用，疑版本兼容问题求解决

Hey Paul, let's work through this issue you're hitting step by step.

First, let's break down what those error messages mean:

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /storage/.../public_html/wp-content/plugins/themehunk-customizer/featuredlite/inc/constant.php on line 3
Deprecated: define(): Declaration of case-insensitive constants is deprecated in /storage/.../public_html/wp-content/plugins/themehunk-customizer/featuredlite/inc/constant.php on line 4

This warning is triggered because PHP 7.3 and later versions phased out support for case-insensitive constants created using the third true parameter in the define() function. WordPress has aligned with modern PHP standards in recent versions, so if your site runs a newer WP release on a host with PHP 7.3+, this outdated plugin code will throw these deprecation warnings.

Here's how you can fix this: #

• Verify your server's PHP version: Jump into your WordPress dashboard > Tools > Site Health > Info tab, then look for the "PHP version" entry. If it's 7.3 or higher, that's exactly why you're seeing these messages.
• Update the plugin's code: Navigate to the constant.php file referenced in the error, and find lines 3 and 4. They’ll likely look like this:

  define('THEMEHUNK_FEATUREDLITE_CONST1', 'sample_value', true);
  define('THEMEHUNK_FEATUREDLITE_CONST2', 'another_value', true);
  

  Remove the third true parameter (or replace it with false—since that’s the default behavior) so the lines become:

  define('THEMEHUNK_FEATUREDLITE_CONST1', 'sample_value');
  define('THEMEHUNK_FEATUREDLITE_CONST2', 'another_value');
  

  This switches the constants to be case-sensitive, which is the modern, recommended approach for PHP.
• Notify the plugin developer: Reach out to the ThemeHunk team and let them know their code needs updating to support newer PHP versions. They might release a patch that fixes this without you having to edit code manually.
• Temporary workaround: If the plugin isn’t critical to your site’s functionality, you can disable it temporarily until an official update is available.

To answer your core question: Yes, this is absolutely a compatibility issue. Newer WordPress versions expect adherence to modern PHP standards, and this plugin hasn’t been updated to match those requirements—leading to the deprecation warnings when running on a host with a recent PHP version.

内容的提问来源于stack exchange，提问作者Paul