An error control operator stores and logs all the errors in an error log making it easier for you to track down the output error the script may give.
The standard PHP code for an error control operator is:
/* Intentional file error */
$my_file = @file ('non_existent_file') or
die ("Failed opening file: error was '$php_errormsg'");
// this works for any expression, not just functions:
$value = @$cache[$key];
// will not issue a notice if the index $key doesn't exist.
-- Source code © PHP.NET
This code needs to be implemented with additional variables so that it tracks and displays the errors as they happen. For more information you can check the official PHP manual available on the homepage of the developer.