WordPress Debug - function "write_log"

write_log.php

<?php
if ( ! function_exists( 'write_log' ) ) {
	/**
	 * Write Log.
	 *
	 * @param string|array|object $log Log.
	 */
	function write_log( $log ) {
		if ( true === WP_DEBUG ) {
			if ( is_array( $log ) || is_object( $log ) ) {
				@error_log( print_r( $log, true ) );
			} else {
				@error_log( $log );
			}
		}
	}
}