What does __FILE__ mean?
问题 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