configure client ibm_db2 for php I am installing a RHEL server with nginx and php that can connect to a db2 database, download and install the "IBM Data Server Client" package, also install the pecl library through: 


  pecl install ibm_db2


however when I do a connectivity test me responds with the following error: 


  [IBM] [CLI Driver] SQL10007N Message "0" could not be retrieved.
  Reason code: "3". SQLCODE = -1390


the code that I'm testing is: 

&lt;?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();
}


am I missing something?

Edit:

searching in the web I found in phpe-ditors this:


  If you created a DB2 instance named db2inst1 in /home/db2inst1/, for
  example, you can add the following line to php.ini:
  
  ibm_db2.instance_name=db2inst1
  
  If you do not set this option in php.ini, you must issue the following
  command to modify your environment variables to enable access to DB2:
  
  bash$ source /home/db2inst1/sqllib/db2profile
  
  To enable your PHP-enabled Web server to access these functions, you
  must either set the ibm_db2.instance_name configuration option in
  php.ini, or source the DB2 instance environment in your Web server
  start script (typically /etc/init.d/httpd or /etc/init.d/apache).


The problem is that I don't know whats the value for ibm_db2.instance_name 

Any idea ?
With the help of @mustaccio achieved do as follows: 

First I added the user db2inst1:      


  db2inst1 useradd


Then, I generated the instance (whatever it means) 
              


  /opt/ibm/db2/V10.5/instance/db2icrt db2inst1


Edit the php configuration file (/etc/php.ini) for add the instance: 
     

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


Edit the initialization file of the php-fpm service (/etc/init.d/php-fpm), which in my case is the one who runs php, to do the source of the db2profile script under the user running this service each time it starts. 

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


And finally restart the service: 


  php-fpm restart service 


Thank you very much for the comments.