Snippet to enable WP_DEBUG but log the errors rather than display them on the page.

example.php

<?php //Do not include the opening PHP tag

//This code enabled WP Debug but disables display_errors so they are not shown on the page.
//Any errors thrown on your site will be stored within a debug.log file within /wp-content/ 
define('WP_DEBUG', true);

if ( WP_DEBUG ) {
        @error_reporting( E_ALL );
        @ini_set( 'log_errors', true );
        @ini_set( 'log_errors_max_len', '0' );
        define( 'WP_DEBUG_LOG', true );
        define( 'WP_DEBUG_DISPLAY', false);
        //define( 'CONCATENATE_SCRIPTS', false );
        //define( 'SAVEQUERIES', true );
}