The next logical step after you have opened a file and finished your business with it is to close that file down. You don't want an open file running around on your server taking up resources and causing mischief!
PHP - File Close Description
In PHP it is not system critical to close all your files after using them because the
server will close all files after the PHP code finishes execution. However the programmer
is still free to make mistakes (i.e. editing a file that you accidentally forgot to close). You should close
all files after you have finished with them because it's a good programming practice and because we told you to!
PHP - File Close FunctionIn a previous tutorial, we had a call to the function fclose to close down a file after we
were done with it. Here we will repeat that example and discuss the importance of closing a file.
$ourFileName = "testFile.txt"; $ourFileHandle = fopen($ourFileName, 'w') or die("can't open file"); fclose($ourFileHandle);
we set our variable "$fileHandle" equal to the file handle returned by the fopen function.
After a file has been closed down with fclose it is impossible to read, write or append
to that file unless it is once more opened up with the fopen function.