本教程操作环境：windows7系统、PHP8.1版、Dell G3电脑。
php无法连接mysqli怎么办？
PHP连接MySql,解决 ”Uncaught Error: Class ‘mysqli‘ not found“问题
我的PHP是7.4的，但是mysql扩展好像是5以前的，我就只能用mysqli扩展来操作数据库
我看了几十篇回答，我的错误是phpinfo()页面只有一个mysqlnd，没有mysqli，所以网页会报错 ”Uncaught Error: Class ‘mysqli’ not found“
在php.ini里
extension_dir = “ext” 也改成绝对路径了，;extension=php_mysqli.dll前面的 ; 也去掉了，还是不行
最后发现下面这段
[MySQLi]
; Maximum number of persistent links. -1 means no limit.
; http://php.net/mysqli.max-persistent
mysqli.max_persistent = -1
; Allow accessing, from PHP’s perspective, local files with LOAD DATA statements
; http://php.net/mysqli.allow_local_infile
;mysqli.allow_local_infile = On
; Allow or prevent persistent links.
; http://php.net/mysqli.allow-persistent
mysqli.allow_persistent = On
; Maximum number of links. -1 means no limit.
; http://php.net/mysqli.max-links
mysqli.max_links = -1
; Default port number for mysqli_connect(). If unset, mysqli_connect() will use
; the $MYSQL_TCP_PORT or the mysql-tcp entry in /etc/services or the
; compile-time value defined MYSQL_PORT (in that order). Win32 will only look
; at MYSQL_PORT.
; http://php.net/mysqli.default-port
mysqli.default_port = 3306
; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
; http://php.net/mysqli.default-socket
mysqli.default_socket =
; Default host for mysqli_connect() (doesn’t apply in safe mode).
; http://php.net/mysqli.default-host
mysqli.default_host =
; Default user for mysqli_connect() (doesn’t apply in safe mode).
; http://php.net/mysqli.default-user
mysqli.default_user =
; Default password for mysqli_connect() (doesn’t apply in safe mode).
; Note that this is generally a bad idea to store passwords in this file.
; Any user with PHP access can run 'echo get_cfg_var(“mysqli.default_pw”)
; and reveal this password! And of course, any users with read access to this
; file will be able to reveal the password as well.
; http://php.net/mysqli.default-pw
mysqli.default_pw =
; Allow or prevent reconnect
mysqli.reconnect = OFF
登录后复制将mysqli.reconnect = OFF改成mysqli.reconnect = on就行了，就很无语，有跟我情况一样的可以改改这个
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