debug.php

<?php

global $_started_time;
if( ! function_exists( '_perf_debug' ) ){
	function _perf_debug( $file, $line, $comment = '' ){
		global $_started_time;

		$file = str_replace( $_SERVER['DOCUMENT_ROOT'], '', $file );

		$time = microtime( true );

		if( ! $_started_time )
			$_started_time = $time;

		$diff = $time - $_started_time;

		if( $comment )
			$comment = $comment . ': ';

		$line = '[' . $time . '] ' . $comment . $file . ' #' . $line . ' (' . $diff . ')';
		echo $line . '<br />' . "\r\n";
		error_log( $line );
	}
}