DataBase prefix problem in mysql-php

[krselva86]

hi to all

im trying to creating new database using php script the coding is
mysql_query('create database db_name');

but it failed to create when i try to create database with name like test_abc it getting success i can't create database without prefix "test_".. when i try through mysql command prompt it getting create in any name.

the problem im facing only when i try through php script.. i think in php configuration file is there any setting to set database_prefix for creating new database under php script. i gone through php.ini file but there is no setting for that

the above problem in not in my localhost its on remote server..

thanks and regards
selva