En mi PHP.INI tengo lo siguiente..... ojala te ayude pero siempre funcionara si tienes las DLLs, ojo que php_mssql.dll es de MS-SQL o sea de SQL SERVER y no tiene nada que ver
Has instalado MySQL ?
extension=php_mysql.dll
; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
;
http://php.net/pdo_mysql.default-socket
pdo_mysql.default_socket = "MySQL"
MySQL]
; Allow accessing, from PHP's perspective, local files with LOAD DATA statements
;
http://php.net/mysql.allow_local_infile
mysql.allow_local_infile = On
; Allow or prevent persistent links.
;
http://php.net/mysql.allow-persistent
mysql.allow_persistent = On
; If mysqlnd is used: Number of cache slots for the internal result set cache
;
http://php.net/mysql.cache_size
mysql.cache_size = 2000
; Maximum number of persistent links. -1 means no limit.
;
http://php.net/mysql.max-persistent
mysql.max_persistent = -1
; Maximum number of links (persistent + non-persistent). -1 means no limit.
;
http://php.net/mysql.max-links
mysql.max_links = -1
; Default port number for mysql_connect(). If unset, mysql_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/mysql.default-port
mysql.default_port = 3306
; Default socket name for local MySQL connects. If empty, uses the built-in
; MySQL defaults.
;
http://php.net/mysql.default-socket
mysql.default_socket = "MySQL"
; Default host for mysql_connect() (doesn't apply in safe mode).
;
http://php.net/mysql.default-host
mysql.default_host =
; Default user for mysql_connect() (doesn't apply in safe mode).
;
http://php.net/mysql.default-user
mysql.default_user =
; Default password for mysql_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("mysql.default_password")
; 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/mysql.default-password
mysql.default_password =
; Maximum time (in seconds) for connect timeout. -1 means no limit
;
http://php.net/mysql.connect-timeout
mysql.connect_timeout = 3
; Trace mode. When trace_mode is active (=On), warnings for table/index scans and
; SQL-Errors will be displayed.
;
http://php.net/mysql.trace-mode
mysql.trace_mode = Off