我最近下载了一个WordPress主题，并尝试运行它，但它给了我一个致命错误，显示了对undefined fatal error（）的调用。为什么会产生此错误？
我是WordPress主题开发的新手。这是我的索引。php和标题。php脚本。如何消除此错误？
文件索引。php
<?php
/**
* The main template file.
*
* This is the most generic template file in a WordPress theme
* and one of the two required files for a theme (the other being style.css).
* It is used to display a page when nothing more specific matches a query.
* E.g., it puts together the home page when no home.php file exists.
*
* @link https://codex.wordpress.org/Template_Hierarchy
*
* @package Astrid
*/
get_header(); ?>
<div id="primary" class="content-area">
<main id="main" class="site-main" role="main">
<?php
if ( have_posts() ) :
if ( is_home() && ! is_front_page() ) : ?>
<header>
<h1 class="page-title screen-reader-text"><?php single_post_title(); ?></h1>
</header>
文件头。php
<?php
/**
* The header for our theme.
*
* This is the template that displays all of the <head> section and everyth ing up until <div id="content">
*
* @link https://developer.wordpress.org/themes/basics/template-files/#template-partials
*
* @package Astrid
*/
?><!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo( \'charset\' ); ?>">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="profile" href="http://gmpg.org/xfn/11">
<link rel="pingback" href="<?php bloginfo( \'pingback_url\' ); ?>">
<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<div class="preloader">
<div class="preloader-inner">
<ul><li></li><li></li><li></li><li></li><li></li><li></li></ul>
</div>
</div>
<div id="page" class="site">
<a class="skip-link screen-reader-text" href="#content"><?php esc_html_e( \'Skip to content\', \'astrid\' ); ?></a>
<header id="masthead" class="site-header <?php echo astrid_has_header(); ?>" role="banner">
<div class="container">
<div class="site-branding col-md-4 col-sm-6 col-xs-12">
<?php astrid_branding(); ?>
</div>
<div class="btn-menu col-md-8 col-sm-6 col-xs-12"><i class="fa fa-navicon"></i></div>
<nav id="mainnav" class="main-navigation col-md-8 col-sm-6 col-xs-12" role="navigation">
<?php wp_nav_menu( array( \'theme_location\' => \'primary\', \'menu_id\' => \'primary-menu\' ) ); ?>
</nav><!-- #site-navigation -->
</div>
</header><!-- #masthead -->
<?php if ( astrid_has_header() == \'has-header\' ) : ?>
<div class="header-image">
<?php astrid_header_text(); ?>
<img class="large-header" src="<?php header_image(); ?>" width="<?php echo esc_attr( get_custom_header()->width ); ?>" alt="<?php bloginfo(\'name\'); ?>">
<?php $mobile_default = get_template_directory_uri() . \'/images/header-mobile.jpg\'; ?>
<?php $mobile = get_theme_mod(\'mobile_header\', $mobile_default); ?>
<?php if ( $mobile ) : ?>
<img class="small-header"
src="<?php echo esc_url($mobile); ?>"
width=" <?php echo esc_attr( get_custom_header()->width ); ?>"
alt="<?php bloginfo(\'name\'); ?>">
<?php else : ?>
<img class="small-header" src="<?php header_image(); ?>" width="1024" alt="<?php bloginfo(\'name\'); ?>">
<?php endif; ?>
</div>
<?php elseif ( astrid_has_header() == \'has-shortcode\' ) : ?>
<div class="shortcode-area">
<?php $shortcode = get_theme_mod(\'astrid_shortcode\'); ?>
<?php echo do_shortcode($shortcode); ?>
</div>
<?php else : ?>
<div class="header-clone"></div>
<?php endif; ?>
<?php if ( !is_page_template(\'page-templates/page_widgetized.php\') ) : ?>
<?php $container = \'container\'; ?>
<?php else : ?>
<?php $container = \'home-wrapper\'; ?>
<?php endif; ?>
<?php do_action(\'astrid_before_content\'); ?>
<div id="content" class="site-content">
<div class="<?php echo $container; ?>">
SO网友:mantis
您的安装出现问题。如@Sumit所评论get_header() 是核心函数，不能未定义。
疑难解答：重新安装WordPress并在WP\\U配置中启用WP\\U调试。php：
define( \'WP_DEBUG\', true );
如果它位于实时站点上，您可能希望改用它：
define( \'WP_DEBUG_LOG\', true );
define( \'WP_DEBUG_DISPLAY\', false );
这将在wp content文件夹的错误日志中列出您的错误。
您的站点应该使用默认主题正常显示，没有错误。
激活主题并检查错误。
