function debug ($data) { 
    echo "<script>\r\n//<![CDATA[\r\nif(!console){var console={log:function(){}}}"; 
    $output    =    explode("\n", print_r($data, true)); 
    foreach ($output as $line) { 
        if (trim($line)) { 
            $line    =    addslashes($line); 
            echo "console.log(\"{$line}\");"; 
        } 
    } 
    echo "\r\n//]]>\r\n</script>"; 
} 

출처: http://kr1.php.net/print_r#96859

ps. tbClass에 포함하여 사용 중인데 쓸만하네요 ㅎㅎㅎ