Follow these steps to configure PHP to allow errors to be logged to a file:

1. In Terminal, type nano /etc/php.ini and press enter
2. Press Ctrl W (to search), type log_errors and press enter
3. Ensure log_errors = On
4. Press Ctrl O (to save)
5. Press Ctrl W (to exit the nano editor)

Create the following PHP file to test error_log.

<?php
$x = 1;
if ($x != 2) 
  {
    error_log("Example error", 3, "/var/tmp/error.log");
  }
?>

View the error log to ensure the error log contians "Example error":

[root@server1 ]# cat /var/tmp/error.log
Example error