Php 面临函数mysqli_init致命错误，而mysqli驱动程序已安装

在更新

database.php

文件后，我面临这个问题，只更新数据库用户和密码

在那之后，我已经通过下面的答案来解决问题

我知道这是同一问题的重复问题。但之后 我检查了

phpinfo（）

文件，发现在我的服务器上 已经安装了

mysqli

驱动程序。我仍然面临这个问题

database.php文件代码：

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/*
| -------------------------------------------------------------------
| DATABASE CONNECTIVITY SETTINGS
| -------------------------------------------------------------------
| This file will contain the settings needed to access your database.
|
| For complete instructions please consult the 'Database Connection'
| page of the User Guide.
|
| -------------------------------------------------------------------
| EXPLANATION OF VARIABLES
| -------------------------------------------------------------------
|
|   ['dsn']      The full DSN string describe a connection to the database.
|   ['hostname'] The hostname of your database server.
|   ['username'] The username used to connect to the database
|   ['password'] The password used to connect to the database
|   ['database'] The name of the database you want to connect to
|   ['dbdriver'] The database driver. e.g.: mysqli.
|           Currently supported:
|                cubrid, ibase, mssql, mysql, mysqli, oci8,
|                odbc, pdo, postgre, sqlite, sqlite3, sqlsrv
|   ['dbprefix'] You can add an optional prefix, which will be added
|                to the table name when using the  Query Builder class
|   ['pconnect'] TRUE/FALSE - Whether to use a persistent connection
|   ['db_debug'] TRUE/FALSE - Whether database errors should be displayed.
|   ['cache_on'] TRUE/FALSE - Enables/disables query caching
|   ['cachedir'] The path to the folder where cache files should be stored
|   ['char_set'] The character set used in communicating with the database
|   ['dbcollat'] The character collation used in communicating with the database
|                NOTE: For MySQL and MySQLi databases, this setting is only used
|                as a backup if your server is running PHP < 5.2.3 or MySQL < 5.0.7
|                (and in table creation queries made with DB Forge).
|                There is an incompatibility in PHP with mysql_real_escape_string() which
|                can make your site vulnerable to SQL injection if you are using a
|                multi-byte character set and are running versions lower than these.
|                Sites using Latin-1 or UTF-8 database character set and collation are unaffected.
|   ['swap_pre'] A default table prefix that should be swapped with the dbprefix
|   ['encrypt']  Whether or not to use an encrypted connection.
|
|           'mysql' (deprecated), 'sqlsrv' and 'pdo/sqlsrv' drivers accept TRUE/FALSE
|           'mysqli' and 'pdo/mysql' drivers accept an array with the following options:
|
|               'ssl_key'    - Path to the private key file
|               'ssl_cert'   - Path to the public key certificate file
|               'ssl_ca'     - Path to the certificate authority file
|               'ssl_capath' - Path to a directory containing trusted CA certificats in PEM format
|               'ssl_cipher' - List of *allowed* ciphers to be used for the encryption, separated by colons (':')
|               'ssl_verify' - TRUE/FALSE; Whether verify the server certificate or not ('mysqli' only)
|
|   ['compress'] Whether or not to use client compression (MySQL only)
|   ['stricton'] TRUE/FALSE - forces 'Strict Mode' connections
|                           - good for ensuring strict SQL while developing
|   ['ssl_options'] Used to set various SSL options that can be used when making SSL connections.
|   ['failover'] array - A array with 0 or more data for connections if the main should fail.
|   ['save_queries'] TRUE/FALSE - Whether to "save" all executed queries.
|               NOTE: Disabling this will also effectively disable both
|               $this->db->last_query() and profiling of DB queries.
|               When you run a query, with this setting set to TRUE (default),
|               CodeIgniter will store the SQL statement for debugging purposes.
|               However, this may cause high memory usage, especially if you run
|               a lot of SQL queries ... disable this to avoid that problem.
|
| The $active_group variable lets you choose which connection group to
| make active.  By default there is only one group (the 'default' group).
|
| The $query_builder variables lets you determine whether or not to load
| the query builder class.
*/
$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'username',
    'password' => 'password',
    'database' => 'DBname',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/*
|--------------------------------------------------------------------------
| Base Site URL
|--------------------------------------------------------------------------
|
| URL to your CodeIgniter root. Typically this will be your base URL,
| WITH a trailing slash:
|
|   http://example.com/
|
| WARNING: You MUST set this value!
|
| If it is not set, then CodeIgniter will try guess the protocol and path
| your installation, but due to security concerns the hostname will be set
| to $_SERVER['SERVER_ADDR'] if available, or localhost otherwise.
| The auto-detection mechanism exists only for convenience during
| development and MUST NOT be used in production!
|
| If you need to allow multiple domains, remember that this file is still
| a PHP script and you can easily do that on your own.
|
*/
//$config['base_url'] = 'http://www.veranolight.com/quiz/';
$config['base_url'] = '/quiz/';

/*
|--------------------------------------------------------------------------
| Index File
|--------------------------------------------------------------------------
|
| Typically this will be your index.php file, unless you've renamed it to
| something else. If you are using mod_rewrite to remove the page set this
| variable so that it is blank.
|
*/
$config['index_page'] = 'index.php';

/*
|--------------------------------------------------------------------------
| URI PROTOCOL
|--------------------------------------------------------------------------
|
| This item determines which server global should be used to retrieve the
| URI string.  The default setting of 'REQUEST_URI' works for most servers.
| If your links do not seem to work, try one of the other delicious flavors:
|
| 'REQUEST_URI'    Uses $_SERVER['REQUEST_URI']
| 'QUERY_STRING'   Uses $_SERVER['QUERY_STRING']
| 'PATH_INFO'      Uses $_SERVER['PATH_INFO']
|
| WARNING: If you set this to 'PATH_INFO', URIs will always be URL-decoded!
*/
$config['uri_protocol'] = 'AUTO';

/*
|--------------------------------------------------------------------------
| URL suffix
|--------------------------------------------------------------------------
|
| This option allows you to add a suffix to all URLs generated by CodeIgniter.
| For more information please see the user guide:
|
| http://codeigniter.com/user_guide/general/urls.html
*/
$config['url_suffix'] = '';

/*
|--------------------------------------------------------------------------
| Default Language
|--------------------------------------------------------------------------
|
| This determines which set of language files should be used. Make sure
| there is an available translation if you intend to use something other
| than english.
|
*/
$config['language'] = 'english';

/*
|--------------------------------------------------------------------------
| Default Character Set
|--------------------------------------------------------------------------
|
| This determines which character set is used by default in various methods
| that require a character set to be provided.
|
| See http://php.net/htmlspecialchars for a list of supported charsets.
|
*/
$config['charset'] = 'UTF-8';

/*
|--------------------------------------------------------------------------
| Enable/Disable System Hooks
|--------------------------------------------------------------------------
|
| If you would like to use the 'hooks' feature you must enable it by
| setting this variable to TRUE (boolean).  See the user guide for details.
|
*/
$config['enable_hooks'] = FALSE;

/*
|--------------------------------------------------------------------------
| Class Extension Prefix
|--------------------------------------------------------------------------
|
| This item allows you to set the filename/classname prefix when extending
| native libraries.  For more information please see the user guide:
|
| http://codeigniter.com/user_guide/general/core_classes.html
| http://codeigniter.com/user_guide/general/creating_libraries.html
|
*/
$config['subclass_prefix'] = 'MY_';

/*
|--------------------------------------------------------------------------
| Composer auto-loading
|--------------------------------------------------------------------------
|
| Enabling this setting will tell CodeIgniter to look for a Composer
| package auto-loader script in application/vendor/autoload.php.
|
|   $config['composer_autoload'] = TRUE;
|
| Or if you have your vendor/ directory located somewhere else, you
| can opt to set a specific path as well:
|
|   $config['composer_autoload'] = '/path/to/vendor/autoload.php';
|
| For more information about Composer, please visit http://getcomposer.org/
|
| Note: This will NOT disable or override the CodeIgniter-specific
|   autoloading (application/config/autoload.php)
*/
$config['composer_autoload'] = FALSE;

/*
|--------------------------------------------------------------------------
| Allowed URL Characters
|--------------------------------------------------------------------------
|
| This lets you specify which characters are permitted within your URLs.
| When someone tries to submit a URL with disallowed characters they will
| get a warning message.
|
| As a security measure you are STRONGLY encouraged to restrict URLs to
| as few characters as possible.  By default only these are allowed: a-z 0-9~%.:_-
|
| Leave blank to allow all characters -- but only if you are insane.
|
| The configured value is actually a regular expression character group
| and it will be executed as: ! preg_match('/^[<permitted_uri_chars>]+$/i
|
| DO NOT CHANGE THIS UNLESS YOU FULLY UNDERSTAND THE REPERCUSSIONS!!
|
*/
$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';

/*
|--------------------------------------------------------------------------
| Enable Query Strings
|--------------------------------------------------------------------------
|
| By default CodeIgniter uses search-engine friendly segment based URLs:
| example.com/who/what/where/
|
| By default CodeIgniter enables access to the $_GET array.  If for some
| reason you would like to disable it, set 'allow_get_array' to FALSE.
|
| You can optionally enable standard query string based URLs:
| example.com?who=me&what=something&where=here
|
| Options are: TRUE or FALSE (boolean)
|
| The other items let you set the query string 'words' that will
| invoke your controllers and its functions:
| example.com/index.php?c=controller&m=function
|
| Please note that some of the helpers won't work as expected when
| this feature is enabled, since CodeIgniter is designed primarily to
| use segment based URLs.
|
*/
$config['allow_get_array'] = TRUE;
$config['enable_query_strings'] = FALSE;
$config['controller_trigger'] = 'c';
$config['function_trigger'] = 'm';
$config['directory_trigger'] = 'd';

/*
|--------------------------------------------------------------------------
| Error Logging Threshold
|--------------------------------------------------------------------------
|
| You can enable error logging by setting a threshold over zero. The
| threshold determines what gets logged. Threshold options are:
|
|   0 = Disables logging, Error logging TURNED OFF
|   1 = Error Messages (including PHP errors)
|   2 = Debug Messages
|   3 = Informational Messages
|   4 = All Messages
|
| You can also pass an array with threshold levels to show individual error types
|
|   array(2) = Debug Messages, without Error Messages
|
| For a live site you'll usually only enable Errors (1) to be logged otherwise
| your log files will fill up very fast.
|
*/
$config['log_threshold'] = 0;

/*
|--------------------------------------------------------------------------
| Error Logging Directory Path
|--------------------------------------------------------------------------
|
| Leave this BLANK unless you would like to set something other than the default
| application/logs/ directory. Use a full server path with trailing slash.
|
*/
$config['log_path'] = '';

/*
|--------------------------------------------------------------------------
| Log File Extension
|--------------------------------------------------------------------------
|
| The default filename extension for log files. The default 'php' allows for
| protecting the log files via basic scripting, when they are to be stored
| under a publicly accessible directory.
|
| Note: Leaving it blank will default to 'php'.
|
*/
$config['log_file_extension'] = '';

/*
|--------------------------------------------------------------------------
| Log File Permissions
|--------------------------------------------------------------------------
|
| The file system permissions to be applied on newly created log files.
|
| IMPORTANT: This MUST be an integer (no quotes) and you MUST use octal
|            integer notation (i.e. 0700, 0644, etc.)
*/
$config['log_file_permissions'] = 0644;

/*
|--------------------------------------------------------------------------
| Date Format for Logs
|--------------------------------------------------------------------------
|
| Each item that is logged has an associated date. You can use PHP date
| codes to set your own date formatting
|
*/
$config['log_date_format'] = 'Y-m-d H:i:s';

/*
|--------------------------------------------------------------------------
| Error Views Directory Path
|--------------------------------------------------------------------------
|
| Leave this BLANK unless you would like to set something other than the default
| application/views/errors/ directory.  Use a full server path with trailing slash.
|
*/
$config['error_views_path'] = '';

/*
|--------------------------------------------------------------------------
| Cache Directory Path
|--------------------------------------------------------------------------
|
| Leave this BLANK unless you would like to set something other than the default
| application/cache/ directory.  Use a full server path with trailing slash.
|
*/
$config['cache_path'] = '';

/*
|--------------------------------------------------------------------------
| Cache Include Query String
|--------------------------------------------------------------------------
|
| Whether to take the URL query string into consideration when generating
| output cache files. Valid options are:
|
|   FALSE      = Disabled
|   TRUE       = Enabled, take all query parameters into account.
|                Please be aware that this may result in numerous cache
|                files generated for the same page over and over again.
|   array('q') = Enabled, but only take into account the specified list
|                of query parameters.
|
*/
$config['cache_query_string'] = FALSE;

/*
|--------------------------------------------------------------------------
| Encryption Key
|--------------------------------------------------------------------------
|
| If you use the Encryption class, you must set an encryption key.
| See the user guide for more info.
|
| http://codeigniter.com/user_guide/libraries/encryption.html
|
*/
$config['encryption_key'] = 'kiAhT6s4psRT4INIHJ7P7PqIU2IVyaw9';

/*
|--------------------------------------------------------------------------
| Session Variables
|--------------------------------------------------------------------------
|
| 'sess_driver'
|
|   The storage driver to use: files, database, redis, memcached
|
| 'sess_cookie_name'
|
|   The session cookie name, must contain only [0-9a-z_-] characters
|
| 'sess_expiration'
|
|   The number of SECONDS you want the session to last.
|   Setting to 0 (zero) means expire when the browser is closed.
|
| 'sess_save_path'
|
|   The location to save sessions to, driver dependent.
|
|   For the 'files' driver, it's a path to a writable directory.
|   WARNING: Only absolute paths are supported!
|
|   For the 'database' driver, it's a table name.
|   Please read up the manual for the format with other session drivers.
|
|   IMPORTANT: You are REQUIRED to set a valid save path!
|
| 'sess_match_ip'
|
|   Whether to match the user's IP address when reading the session data.
|
|   WARNING: If you're using the database driver, don't forget to update
|            your session table's PRIMARY KEY when changing this setting.
|
| 'sess_time_to_update'
|
|   How many seconds between CI regenerating the session ID.
|
| 'sess_regenerate_destroy'
|
|   Whether to destroy session data associated with the old session ID
|   when auto-regenerating the session ID. When set to FALSE, the data
|   will be later deleted by the garbage collector.
|
| Other session cookie settings are shared with the rest of the application,
| except for 'cookie_prefix' and 'cookie_httponly', which are ignored here.
|
*/
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

// added by kcj
$config['sess_use_database'] = TRUE;
$config['sess_match_ip'] = TRUE;
$config['sess_match_useragent'] = TRUE;

/*
|--------------------------------------------------------------------------
| Cookie Related Variables
|--------------------------------------------------------------------------
|
| 'cookie_prefix'   = Set a cookie name prefix if you need to avoid collisions
| 'cookie_domain'   = Set to .your-domain.com for site-wide cookies
| 'cookie_path'     = Typically will be a forward slash
| 'cookie_secure'   = Cookie will only be set if a secure HTTPS connection exists.
| 'cookie_httponly' = Cookie will only be accessible via HTTP(S) (no javascript)
|
| Note: These settings (with the exception of 'cookie_prefix' and
|       'cookie_httponly') will also affect sessions.
|
*/
$config['cookie_prefix']    = '';
$config['cookie_domain']    = '';
$config['cookie_path']      = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']  = FALSE;

/*
|--------------------------------------------------------------------------
| Standardize newlines
|--------------------------------------------------------------------------
|
| Determines whether to standardize newline characters in input data,
| meaning to replace \r\n, \r, \n occurrences with the PHP_EOL value.
|
| This is particularly useful for portability between UNIX-based OSes,
| (usually \n) and Windows (\r\n).
|
*/
$config['standardize_newlines'] = FALSE;

/*
|--------------------------------------------------------------------------
| Global XSS Filtering
|--------------------------------------------------------------------------
|
| Determines whether the XSS filter is always active when GET, POST or
| COOKIE data is encountered
|
| WARNING: This feature is DEPRECATED and currently available only
|          for backwards compatibility purposes!
|
*/
$config['global_xss_filtering'] = FALSE;

/*
|--------------------------------------------------------------------------
| Cross Site Request Forgery
|--------------------------------------------------------------------------
| Enables a CSRF cookie token to be set. When set to TRUE, token will be
| checked on a submitted form. If you are accepting user data, it is strongly
| recommended CSRF protection be enabled.
|
| 'csrf_token_name' = The token name
| 'csrf_cookie_name' = The cookie name
| 'csrf_expire' = The number in seconds the token should expire.
| 'csrf_regenerate' = Regenerate token on every submission
| 'csrf_exclude_uris' = Array of URIs which ignore CSRF checks
*/
$config['csrf_protection'] = FALSE;
$config['csrf_token_name'] = 'csrf_test_name';
$config['csrf_cookie_name'] = 'csrf_cookie_name';
$config['csrf_expire'] = 7200;
$config['csrf_regenerate'] = TRUE;
$config['csrf_exclude_uris'] = array();

/*
|--------------------------------------------------------------------------
| Output Compression
|--------------------------------------------------------------------------
|
| Enables Gzip output compression for faster page loads.  When enabled,
| the output class will test whether your server supports Gzip.
| Even if it does, however, not all browsers support compression
| so enable only if you are reasonably sure your visitors can handle it.
|
| Only used if zlib.output_compression is turned off in your php.ini.
| Please do not use it together with httpd-level output compression.
|
| VERY IMPORTANT:  If you are getting a blank page when compression is enabled it
| means you are prematurely outputting something to your browser. It could
| even be a line of whitespace at the end of one of your scripts.  For
| compression to work, nothing can be sent before the output buffer is called
| by the output class.  Do not 'echo' any values with compression enabled.
|
*/
$config['compress_output'] = FALSE;

/*
|--------------------------------------------------------------------------
| Master Time Reference
|--------------------------------------------------------------------------
|
| Options are 'local' or any PHP supported timezone. This preference tells
| the system whether to use your server's local time as the master 'now'
| reference, or convert it to the configured one timezone. See the 'date
| helper' page of the user guide for information regarding date handling.
|
*/
$config['time_reference'] = 'local';

/*
|--------------------------------------------------------------------------
| Rewrite PHP Short Tags
|--------------------------------------------------------------------------
|
| If your PHP installation does not have short tag support enabled CI
| can rewrite the tags on-the-fly, enabling you to utilize that syntax
| in your view files.  Options are TRUE or FALSE (boolean)
|
| Note: You need to have eval() enabled for this to work.
|
*/
$config['rewrite_short_tags'] = FALSE;

/*
|--------------------------------------------------------------------------
| Reverse Proxy IPs
|--------------------------------------------------------------------------
|
| If your server is behind a reverse proxy, you must whitelist the proxy
| IP addresses from which CodeIgniter should trust headers such as
| HTTP_X_FORWARDED_FOR and HTTP_CLIENT_IP in order to properly identify
| the visitor's IP address.
|
| You can use both an array or a comma-separated list of proxy addresses,
| as well as specifying whole subnets. Here are a few examples:
|
| Comma-separated:  '10.0.1.200,192.168.5.0/24'
| Array:        array('10.0.1.200', '192.168.5.0/24')
*/
$config['proxy_ips'] = '';
$config['authentication'] = array(
    'username' => 'admin',
    'password' => '11111'
);

$config['post_photo_url'] = $config['base_url'].'assets/images/posts/';
$config['post_video_url'] = $config['base_url'].'assets/videos/';
$config['post_thumb_url'] = $config['base_url'].'assets/images/thumb/';
$config['user_photo_url'] = $config['base_url'].'assets/images/users/';

---

看起来您遇到了另一种错误，而不是database.php上的“configuration”。问题是：“无法修改标题信息-标题已由发送”

有一个解决办法。这是一个已知的错误。请阅读：

如何修复PHP中的“已发送邮件头”错误
答案是“发送头之前没有输出！”
我已经解决了这个问题，在我的配置文件中添加了会话变量。我已经用下面的代码替换了所有会话变量，它正在工作

$r = implode('/', array_slice(explode('/', $_SERVER["SCRIPT_FILENAME"]),0,-1));
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'my_session';
$config['sess_expiration'] = 14400;
$config['sess_save_path'] = $r.'/session/';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 600;
$config['sess_regenerate_destroy'] = FALSE;

我已经检查过了，没有任何空白，或者根据你分享的问题。所以，还有另一种输入。但是我们可以查看database.php文件上的配置。将其粘贴到此处[注意：不要共享生产数据，如果它不在本地主机上，请进行更改]您的基本URL设置错误。看看这个例子：//$config['base_url']=''$配置['base_url']='/quick/'；输入完整的URL。就像上面的评论一样，您的数据库设置似乎正常。您使用的PHP版本是什么？如果PHP版本很旧，则不能使用“mysqli”API。你会使用“mysql”-这里是“dbdriver”=>“mysqli”你也检查过你的数据库凭据吗？非常感谢你的帮助Jonas。现在它工作得很好。
$r = implode('/', array_slice(explode('/', $_SERVER["SCRIPT_FILENAME"]),0,-1));
$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'my_session';
$config['sess_expiration'] = 14400;
$config['sess_save_path'] = $r.'/session/';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 600;
$config['sess_regenerate_destroy'] = FALSE;