Simple debug trace to wp-content/debug.log

log.php

<?php
/**
 * Simple debug trace to wp-content/debug.log
 *
 * @usage _log( $var );
 *
 * @param $log mixed A string|array|object you want to dump into wp-content/debug.log
 */
if ( ! function_exists( '_log' ) ) {

	// Use built-in logging or write to file directly, depending on the WP_DEBUG constant value
	function _log( $log ) {

		// If debug mode is ON, just dump into the log file
		if ( true == WP_DEBUG ) {

			_print_log( $log );

		// If debug mode is OFF (usually, on production), write into file instead
		} else {

			ob_start();

			$timestamp = date('d-M-Y h:i:s T');
			
			echo "[{$timestamp}]\r\n";
			
			_print_log( $log );
			
			echo "\r\n";

			file_put_contents( ABSPATH . 'wp-content/debug.log', ob_get_contents(), FILE_APPEND );

			ob_end_clean();
			
		}

	}

	// Outout the contents of $log var depending on its type
	function _print_log( $log ) {

		if ( is_array( $log ) || is_object( $log ) ) {
			
			print_r( $log );
			
		} else {
			
			echo( $log );
			
		}

	}
	
}