Mysql variables are not shown for a php application

Issue

• We have a php application and added a mysql cartridge, when we try to print the environment variables using var_dump($_ENV); or phpinfo();, mysql related variables are not printed :

OPENSHIFT_MYSQL_DB_HOST 
OPENSHIFT_MYSQL_DB_PORT 
OPENSHIFT_MYSQL_DB_USERNAME 
OPENSHIFT_MYSQL_DB_PASSWORD 
OPENSHIFT_MYSQL_DB_SOCKET
OPENSHIFT_MYSQL_DB_URL

However when we ssh to application and run env command those variables are present.
- Environmental variables for mysql database not working in application.
- getenv('OPENSHIFT_MYSQL_DB_HOST') empty from php code.
- MySql env variables are returned empty values in Openshift.