How to debug when error_log not working as expected

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Trying to debug my development and running into a lot of frustrations with lack of output in the debug.log. For example, I have this defined in wp-config.php:

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );
ini_set( 'display_errors', 0 );

I have this in my functions.php

add_filter( 'the_content', 'my_custom_function' );
function my_custom_function( $content ){
  error_log( 'this fired' ); //never works!
  $return $content;
}

What am I missing?

1 Answer
1

After disabling all plugins I was able to narrow down which one was affecting the log output. The client had installed Speed of Light plugin to provide caching and compression which was also effecting wp_debug capabilities.

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