如何解决Sparkling 主题与 PHP-8 不兼容
升级到 PHP 8.0 后，网站无法运行 - 显示白页 - 并导致此错误：
Got error 'PHP message: Fatal error: Uncaught Error: Undefined constant "HEADER" in
C:\xampp\htdocs\portfolio\wp-content\themes\sparkling\inc\custom-header.php:56
Stack trace:
#0 C:\xampp\htdocs\portfolio\wp-includes\class-wp-hook.php(292): sparkling_header_style('')
#1 C:\xampp\htdocs\portfolio\wp-includes\class-wp-hook.php(316): WP_Hook->apply_filters(NULL,Array)
#2 C:\xampp\htdocs\portfolio\wp-includes\plugin.php(484): WP_Hook->do_action(Array)
#3 C:\xampp\htdocs\portfolio\wp-includes\general-template.php(3009): do_action('wp_head')
#4 C:\xampp\htdocs\portfolio\wp-content\themes\sparkling\header.php(30): wp_head()
#5 C:\xampp\htdocs\portfolio\wp-includes\template.php(730): require_once('C:\\xampp\\htdocs...')
#6 C:\xampp\htdocs\portfolio\wp-includes\template.php(676): load_template('C:\\xampp\\htdocs...',true,Array)
#7 C:\xampp\htdocs\portfolio\wp-includes\general-template.php(48): locate_template(Array,Array)
#8 C:\xampp\htdocs\portfolio\wp-content\themes\sparkling\index.php(11): get_header()
#9 C:\xampp\htdocs\portfolio\wp-includes\template-loader.php(106): include('C:\\xampp\\htdocs...')
#10 C:\xampp\htdocs\portfolio\wp-blog-header.php(19): require_once('C:\\xampp\\htdocs...')
#11 C:\xampp\htdocs\portfolio\index.php(17): require('C:\\xampp\\htdocs...')
#12 {main} thrown in C:\xampp\htdocs\portfolio\wp-content\themes\sparkling\inc\custom-header.php on line 56
解决方法
据我了解 wp-content/themes/sparkling/inc/custom-header.php 中的代码，这必须更改：
@$a = HEADER; // @codingStandardsIgnoreLine
@$b = TEXTCOLOR; // @codingStandardsIgnoreLine
到
@$a = 'HEADER'; // @codingStandardsIgnoreLine
@$b = 'TEXTCOLOR'; // @codingStandardsIgnoreLine
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