问与MS SQL的PHP连接。可在工作站上运行，但不能在2台服务器上运行

EN

<?php

$serverName = "Agency"; //serverName\instanceName
$connectionInfo = array( "Database"=>"Dashboard_DB", "UID"=>"uname", "PWD"=>"pword");
$conn = sqlsrv_connect( $serverName, $connectionInfo);

if( $conn ) {
     echo "Connection established.<br />";
}else{
     echo "Connection could not be established.<br />";
     die( print_r( sqlsrv_errors(), true));
}
?>

?>

Connection could not be established.
Array ( [0] => Array ( [0] => IMSSP [SQLSTATE] => IMSSP [1] => -49 [code] => -49 [2] => This extension requires the Microsoft ODBC Driver for SQL Server. Access the following URL to download the ODBC Driver for SQL Server for x86: https://go.microsoft.com/fwlink/?LinkId=163712 [message] => This extension requires the Microsoft ODBC Driver for SQL Server. Access the following URL to download the ODBC Driver for SQL Server for x86: https://go.microsoft.com/fwlink/?LinkId=163712 ) [1] => Array ( [0] => IM002 [SQLSTATE] => IM002 [1] => 0 [code] => 0 [2] => [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified [message] => [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified ) ) 

extension=bz2
extension=curl
extension=fileinfo
extension=gd2
extension=gettext
;extension=gmp
;extension=intl
;extension=imap
;extension=interbase
;extension=ldap
;extension=mbstring
;extension=exif      ; Must be after mbstring as it depends on it
;extension=mysqli
;extension=oci8_12c  ; Use with Oracle Database 12c Instant Client
;extension=odbc
;extension=openssl
;extension=pdo_firebird
extension=php_pdo_sqlsrv_72_ts_x64
extension=php_sqlsrv_72_ts_x64
;extension=php_pdo_mysql
;extension=pdo_oci
;extension=pdo_odbc
;extension=pdo_pgsql
;extension=pdo_sqlite
;extension=pgsql
;extension=shmop