在不违反用户输入的情况下记录时间戳

Question

Im trying get a timestamp for a reason in website, but according to the way i have coded right now the timestamp prints inside the user inputs area, the current code is as follows

$message['HTTP_USER_AGENT'] = $_SERVER['HTTP_USER_AGENT'].' Timestamp : ' . $orgtimestamp;
$sql = 'INSERT INTO imp_table (message) VALUES("'.mysql_real_escape_string(serialize($message)).'");';
echo(mysql_real_escape_string(serialize($message)))."
";

the output is like this

a:1:{s:15:\"HTTP_USER_AGENT\";s:106:\"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 Timestamp : 2014-09-15 09:37:58am\";} 

So can anybody help me to get a output where timestamp appears like i have shown below

a:1: Timestamp : 2014-09-15 09:37:58am :{s:15:\"HTTP_USER_AGENT\";s:106:\"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 \";} 

Answer 1

a:1: Timestamp : 2014-09-15 09:37:58am :{s:15:\"HTTP_USER_AGENT\";s:106:\"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0 \";}

That is not proper serialized string.

$message['HTTP_USER_AGENT'] = $_SERVER['HTTP_USER_AGENT'];
$message['Timestamp'] = $orgtimestamp;
echo(mysql_real_escape_string(serialize($message)))."
";

Code above first make array and then serialize it so it should look like:

a:2{a:1{s:15:\"HTTP_USER_AGENT\";s:106:\"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0"},{a:1{s:9:\"Timestamp\";s:21:\"2014-09-15 09:37:58am\"}}