8. Error Handling

Activity 8.1: Improving the User Experience through the Handling System and User-Level Errors

Solution

1. Create a file called factorial.php.
2. First, add the exception handler that, in order to log the exceptions to the log file, will create a data stream resource using the fopen() function, which is assigned to the static variable, $fh:

   $exceptionHandler = function (Throwable $e) {
       static $fh;
       if (is_null($fh)) {
           $fh = fopen(__DIR__ . '/app.log', 'a');
           if (!$fh) {
               echo 'Unable to access the log file.', PHP_EOL;
               exit(1);
           }
       }

3. Format the log message and write to the log...