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I have the following code from Codeigniter index.php My understanding is that, If / of string position in $system_folder (in this case CIcore_1_7_1) is false , and if realpath function exists AND (?) is not false , $system_folder is assigned to (?) /$system_folder . else $system_folder is assigned to $system_folder with replacing \\ with / . Q1. What does realpath function means? Q2. What does this mean? @realpath(dirname(__FILE__)) Q3. Am I right? Do I have any misunderstanding? Q4. What kind of situation do you need the following? str_replace("\\", "/", $system_folder) $system_folder = "CIcore_1_7_1"; /* |--------------------------------------------------------------- | SET THE SERVER PATH |--------------------------------------------------------------- | | Let's attempt to determine the full-server path to the "system" | folder in order to reduce the possibility of path problems. | Note: We only attempt this if the user hasn't specified a | full server path. | */ if (strpos($system_folder, '/') === FALSE) { if (function_exists('realpath') AND @realpath(dirname(__FILE__)) !== FALSE) { $system_folder = realpath(dirname(__FILE__)).'/'.$system_folder; } } else { // Swap directory separators to Unix style for consistency $system_folder = str_replace("\\", "/", $system_folder); }

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