<?php
$database = 'mydb';
$user = 'usr';
$password = 'pass';
$hostname = 'ipaddr';
$port = 9501;

$conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;" . "HOSTNAME=$hostname;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;";
$conn = db2_connect($conn_string, '', '');

if ($conn) {
    echo "Connection succeeded.";
    db2_close($conn);
}
else {
    echo db2_conn_error();
    echo db2_conn_errormsg();
}

extension = / usr/lib64/php/modules/ibm_db2.so
 ibm_db2.instance_name = db2inst1

#for DB2
 . /opt/ibm/db2/V10.5/cfg/db2profile

useradd db2inst1

/opt/ibm/db2/V11.1/instance/db2icrt db2inst1

extension=/usr/lib64/php/modules/ibm_db2.so
ibm_db2.instance_name=db2inst1