How to Enable PHP Error Logging via htaccess

By Jeff Starr on Monday, December 17, 2007 — 12 Responses metadata

Post #462 categorized as Function, last updated on May 27, 2009
Tagged with apache, error, htaccess, log, php, tips, tricks

In this brief tutorial, I will show Apache users how to suppress PHP errors from visitors and enable PHP error logging via htaccess.

Tracking your site’s PHP errors is an excellent way to manage and troubleshoot unexpected issues related to plugins and themes. Even better, monitoring PHP errors behind the scenes via private log is far better than trying to catch them as they appear at random visits. Thanks to the magical powers of htaccess, there is an easy way to implement this effective strategy.

Hide PHP errors from visitors

In our article, , we discuss a technique whereby PHP errors are suppressed via htaccess. This is done by including the following htaccess directives to your domain’s httpd.conf or to your site’s root (or other target directory) htaccess file:

# supress php errors
php_flag display_startup_errors off
php_flag display_errors off
php_flag html_errors off

With that in place, PHP errors will no longer be displayed publicly on your site. This eliminates a potential security risk, and keeps those ugly, unintelligible PHP errors from breaking your site layout and disorienting your visitors. No editing required for this code.

Enable private PHP error logging

Now that we have hidden PHP errors from public view, let’s enable the logging of PHP errors so that we can privately keep track of them. This is done by including the following htaccess directives to your domain’s httpd.conf or to your site’s root (or other target directory) htaccess file:

# enable PHP error logging
php_flag  log_errors on
php_value error_log  /home/path/public_html/domain/PHP_errors.log

For this to work, you will need to edit the path in the last line to reflect the actual location of your PHP_errors.log file. Of course, you will need to create this file and subsequently set the file permissions to 755 or, if necessary, 777. Finally, you need to secure the log file itself by adding this final line of code to your htaccess file:

# prevent access to PHP error log
<Files PHP_errors.log>
 Order allow,deny
 Deny from all
 Satisfy All
</Files>

Then, after everything is in place, check that everything is working by triggering a few PHP errors. You may also want to verify protection of your error log by trying to access it via a browser.

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