The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable | Changelog | 
|---|---|---|---|
| ibm_db2.binmode | "1" | PHP_INI_ALL | |
| ibm_db2.i5_all_pconnect | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.6.5. | 
| ibm_db2.i5_allow_commit | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.4.9. | 
| ibm_db2.i5_dbcs_alloc | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.5.0. | 
| ibm_db2.instance_name | NULL | PHP_INI_SYSTEM | Available since ibm_db2 1.0.2. | 
| ibm_db2.i5_ignore_userid | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.8.0. | 
Here's a short explanation of the configuration directives.
ibm_db2.binmode
     integer
    This option controls the mode used for converting to and from binary data in the PHP application.
1 (DB2_BINARY)
2 (DB2_CONVERT)
3 (DB2_PASSTHRU)
ibm_db2.i5_all_pconnect
     integer
    
      This option overrides i5 db2_connect() full open and close in the PHP 
      application. When ibm_db2.i5_all_pconnect = 1, all db2 connections 
      become persistent (db2_pconnect()). On i5/OS, db2_pconnect() performs 
      dramatically better with lower machine stress over db2_connect(). This 
      is a convenience override of db2_connect() to evoke db2_pconnect() without 
      PHP source code changes. 
      
0 db2_connect() default full open and close
1 db2_connect() override to db2_pconnect() for persistent connection only
ibm_db2.i5_allow_commit
     integer
    This option controls the commit mode used for i5 schema collections in the PHP application.
         0 no commit (see i5_commit for override)
        
         1 allow commit (see i5_commit for override)
        
ibm_db2.i5_dbcs_alloc
     integer
    This option controls the internal ibm_db2 allocation scheme for large DBCS column buffers.
         0 no expanded allocations (see i5_dbcs_alloc for override)
        
         1 use expanded allocations (see i5_dbcs_alloc for override)
        
ibm_db2.instance_name
     string
    On Linux and UNIX operating systems, this option defines the name of the instance to use for cataloged database connections. If this option is set, its value overrides the DB2INSTANCE environment variable setting.
This option is ignored on Windows operating systems.
ibm_db2.i5_ignore_userid
     integer
    
      This option overrides i5 db2_(p)connect userid and password in the PHP 
      application. When  ibm_db2.i5_ignore_userid = 1, 
      all db2 (p)connections become null userid and null password. Therefore 
      Apache jobs connect with the current profile (NOBODY). Use of this override 
      is only for simple DB2 based websites that never require profile switching 
      and therefore can avoid all overhead of server mode additional QSQSRVR jobs. 
      This is a convenience override of db2_(p)connect to set the userid and password 
      values to null without PHP source code changes. This override can be used in 
      combination with ibm_db2.i5_all_pconnect = 1.
      
0 db2_(p)connect with specified userid and password
1 db2_(p)connect override connect with null userid and null password