The geoip_db_avail() function is an inbuilt function in PHP which is used to check whether a GeoIP database is available or not. The function does not consider the proper existence of a file instead it checks whether it is readable or not.
Syntax:
bool geoip_db_avail( $database )
Parameters: This function accepts a single parameter $database which is integer type and it requires GeoIP database (GeoIP refers to the method of locating a computer terminal’s geographic location by identifying the terminal’s IP address. GeoIP can point a terminal location to a city, it requires the use of a GeoIP database).
Return Values: This function returns True on success (if the database exists) or False on failure (if the database is not found) and returns NULL if an error is encountered.
Below programs illustrate the geoip_db_avail() function in PHP:
Program 1:
<?php // PHP code implementing geoip_db_avail() function   // Checks if the database entered is valid or not if (geoip_db_avail(GEOIP_COUNTRY_EDITION))     echo "True"; ?> |
Output:
True
Program 2:
<?php // PHP code implementing geoip_db_avail() function   // Checks if the database entered is valid or not if (geoip_db_avail(GEOIP_ORG_EDITION))     echo "True"; ?> |
Output:
True
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Reference: http://php.net/manual/en/function.geoip-db-avail.php
