Debug logs at wordpress not working - wordpress

Question

I would like to enable debug logs of wordpress site, added following setting at wp-config.php
/* WordPress debug mode for developers. */
define('WP_DEBUG', true);
if (WP_DEBUG) {
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);
#ini_set('display_errors', 0);
}
created debug.log file under wp-content folder.
updated 777 on wp-content as well as debug.log..
But still file is blank..
Please let me know how can I fix it...
Just I would like to debug the site, some times home page going in infinite loop..i.e. browser not loading the page.. CPU goes to 100%...
Thanks

Answer 1

You have #ini_set('display_errors', 0); - which will tell PHP (not WordPress) to stop displaying errors. WordPress requires errors to be turned on in order for it to pass them to the appropriate place. define('WP_DEBUG_DISPLAY', false); or define('WP_DEBUG', false); should take care of hiding them on the front end for you.
Also, you should only need to define the constants, the IF statement you've created isn't necessary. What you're essentially saying there is "Turn on error reporting. Now, if error reporting is turned on, do this." - although logically correct, it's verbose. Simply defining the WP_DEBUG constant as true should be enough, as WordPress will do the rest of the work.
Also - if wp_debug.log doesn't exist- WordPress will create it for you (with the correct permissions), assuming it has permission to do so on your server (in most cases this will be true). So - you shouldn't need to change the CHMOD values of wp-content or it's children. I'd advise you to change them to WordPress' recommended values (755 for folders, and 644 for files) - as a CHMOD value of 777 is pretty foolhardy to have.
You should only need the following:
define('WP_DEBUG', true); // Turn on WP Debugging
define('WP_DEBUG_LOG', true); // Log errors to wp_debug.log
define('WP_DEBUG_DISPLAY', false); // Turns off error reporting on the front end

Answer 2

According to Debugging in Wordpress:
You must insert this BEFORE /* That's all, stop editing! Happy
blogging. */ in the wp-config.php file
In your case "this" is:
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

Answer 3

It may also be worth checking the WP_CONTENT_DIR as that is where the debug.log file would be put. The value of WP_CONTENT_DIR may be checked as suggested in this question, or using the Wordfence plugin->Tools->Diagnostics->WordPress Settings.
Normally it is not explicitly set unless there's a non-standard setup. Though it can can be set in wp-config.php e.g. define('WP_CONTENT_DIR', '/var/www/sites/wordpress/wp-content');