(PHP 5, PHP 7 < 7.4.0)
ibase_service_attach — Connect to the service manager
$host, string $dba_username, string $dba_password): resource|false
hostThe name or ip address of the database host. You can define the port by adding '/' and port number. If no port is specified, port 3050 will be used.
dba_usernameThe name of any valid user.
dba_passwordThe user's password.
   Returns a Interbase / Firebird link identifier on success or false on failure.
  
Example #1 ibase_service_attach() example
<?php
    // Attach to the remote Firebird server by ip address
    if (($service = ibase_service_attach('10.1.1.199', 'sysdba', 'masterkey')) != FALSE) {
        
        // Successfully attached. 
        // Fetch server version (something like 'LI-V3.0.4.33054 Firebird 3.0')
        $server_version  = ibase_server_info($service, IBASE_SVC_SERVER_VERSION);
        // Fetch server implementation (something like 'Firebird/Linux/AMD/Intel/x64')
        $server_implementation = ibase_server_info($service, IBASE_SVC_IMPLEMENTATION);
        // Detach from server (disconnect)
        ibase_service_detach($service);
        // Output the info
        echo "Server version: " . $server_version . "<br/>";
        echo "Server implementation: " . $server_implementation;
    }
    else {
        // Output message on error
        $conn_error = ibase_errmsg();
        die($conn_error);
    }
?>
Example #2 ibase_service_attach() example using hostname/port syntax
<?php
    // Attach to the remote Firebird server by name. Use Port 3050.
    if (($service = ibase_service_attach('FB-SRV-01.contoso.local/3050', 'sysdba', 'masterkey')) != FALSE) {
        
        // Successfully attached. 
        // Fetch server version (something like 'LI-V3.0.4.33054 Firebird 3.0')
        $server_version  = ibase_server_info($service, IBASE_SVC_SERVER_VERSION);
        // Fetch server implementation (something like 'Firebird/Linux/AMD/Intel/x64')
        $server_implementation = ibase_server_info($service, IBASE_SVC_IMPLEMENTATION);
        // Detach from server (disconnect)
        ibase_service_detach($service);
        // Output the info
        echo "Server version: " . $server_version . "<br/>";
        echo "Server implementation: " . $server_implementation;
    }
    else {
        // Output message on error
        $conn_error = ibase_errmsg();
        die($conn_error);
    }
?>