Why eval() wp-config?

I’m in difficult using this plugin because the “WP_DB_Connect” use the function “eval()” for evaluate the content of “wp-config.php” as a string . My “wp-config.php” contains a conditional switch. In this “switch” there is the definition of the constants. Using function “eval()” returns to me an unespected database connection!
There is a particular motivation of using “eval()” function?
Do you have any contraindications to change the “__construct” of WP_DB_Connect in this manner?:

function __construct($type=1,$filePath=’./wp-config.php’){

require( $filePath );//new line

$this->filePath=$filePath;
$this->getFile();
//$this->serverBasedCondition();

/**
* eval the WP contants into PHP
*/
/*foreach ($this->paramA as $p) {
$this->evalParam(‘define(\”.$p.’\”,’\’);’);
}*/

$this->createConstant(‘$table_prefix=\”,”‘;”);

switch ($type) {
default:
case 1:
$this->conMySQL_Connect();
break;
case 2:
$this->conPDO();
break;
case 3:
$this->conMySQLi();
break;
}
}

Thanks,
Marina.

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