CodeIgniter项目部署到服务器后网站无法正常渲染怎么解决？

访问站点直接返回PHP源码的核心原因是生产环境Web服务器未正确配置PHP解析，配合CodeIgniter项目的专属配置调整即可解决，具体操作如下：

1. 优先排查Web服务器PHP解析配置 #

• 若使用Apache服务器：
  • 确认已安装对应版本的PHP模块，且Apache配置文件中已开启php_module，未被注释
  • 确认Apache配置中添加了PHP文件类型解析规则：AddType application/x-httpd-php .php
  • 确认站点根目录的执行权限配置正确，允许PHP文件执行
• 若使用Nginx服务器：
  • 确认站点配置文件中已正确配置PHP-FPM转发规则，所有.php后缀的请求都会转发到PHP处理进程
  • 确认PHP-FPM服务处于正常运行状态
• 验证方式：在站点根目录新建info.php文件，写入以下代码，访问该文件若能正常显示PHP信息页面则解析配置正常，完成后删除该测试文件

<?php phpinfo(); ?>

2. 修正CodeIgniter入口文件缺失配置 #

你当前的index.php入口文件删除冗余代码后缺失了$application_folder、BASEPATH的核心定义代码，需要补全缺失部分，路径按照你实际的项目文件夹结构调整即可：

/*
 *---------------------------------------------------------------
 * APPLICATION DIRECTORY NAME
 *---------------------------------------------------------------
 *
 * If you want this front controller to use a different "application"
 * directory than the default one you can set its name here. The directory
 * can also be renamed or relocated anywhere on your server. If you do,
 * use an absolute (full) server path.
 *
 * NO TRAILING SLASH!
 */
$application_folder = 'application';

/*
 *---------------------------------------------------------------
 * VIEW DIRECTORY NAME
 *---------------------------------------------------------------
 *
 * If you want to move the view directory out of the application
 * directory, set the path to it here. The directory can be renamed
 * and relocated anywhere on your server. If blank, it will default
 * to the standard location inside your application directory.
 * If you do move this, use an absolute (full) server path.
 *
 * NO TRAILING SLASH!
 */
$view_folder = '';

/*
 * ---------------------------------------------------------------
 *  Resolve the system path for increased reliability
 * ---------------------------------------------------------------
 */

// Set the current directory correctly for CLI requests
if (defined('STDIN'))
{
	chdir(dirname(__FILE__));
}

if (($_temp = realpath($system_path)) !== FALSE)
{
	$system_path = $_temp.DIRECTORY_SEPARATOR;
}
else
{
	// Ensure there's a trailing slash
	$system_path = strtr(
		rtrim($system_path, '/\\'),
		'/\\',
		DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
	).DIRECTORY_SEPARATOR;
}

// Is the system path correct?
if ( ! is_dir($system_path))
{
	header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
	echo 'Your system folder path does not appear to be set correctly. Please open the following file and correct this: '.pathinfo(__FILE__, PATHINFO_BASENAME);
	exit(3); // EXIT_CONFIG
}

/*
 * -------------------------------------------------------------------
 *  Now that we know the path, set the main path constants
 * -------------------------------------------------------------------
 */
// The name of THIS file
define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));

// Path to the system directory
define('BASEPATH', $system_path);

// Path to the front controller (this file) directory
define('FCPATH', dirname(__FILE__).DIRECTORY_SEPARATOR);

// Name of the "system" directory
define('SYSDIR', basename(BASEPATH));

/*
 * ---------------------------------------------------------------
 *  Resolve the application path for increased reliability
 * ---------------------------------------------------------------
 */
if (is_dir($application_folder))
{
	if (($_temp = realpath($application_folder)) !== FALSE)
	{
		$application_folder = $_temp;
	}
	else
	{
		$application_folder = strtr(
			rtrim($application_folder, '/\\'),
			'/\\',
			DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
		);
	}
}
elseif (is_dir(BASEPATH.$application_folder.DIRECTORY_SEPARATOR))
{
	$application_folder = BASEPATH.strtr(
		trim($application_folder, '/\\'),
		'/\\',
		DIRECTORY_SEPARATOR.DIRECTORY_SEPARATOR
	);
}
else
{
	header('HTTP/1.1 503 Service Unavailable.', TRUE, 503);
	echo 'Your application folder path does not appear to be set correctly. Please open the following file and correct this: '.SELF;
	exit(3); // EXIT_CONFIG
}

3. 调整.htaccess适配生产环境 #

你当前的.htaccess规则可正常使用，若后续出现路径404问题可将重写规则调整为：

RewriteEngine On
RewriteBase /
DirectoryIndex index.php
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

4. 生产环境参数调整 #

调试完成后将index.php中的环境变量设置调整为生产环境，避免泄露敏感信息：

define('ENVIRONMENT', isset($_SERVER['CI_ENV']) ? $_SERVER['CI_ENV'] : 'production');

内容的提问来源于stack exchange，提问作者Sagar