Php 在不违反用户输入的情况下记录时间戳

我试图在网站上得到一个时间戳是有原因的，但根据我现在编码的方式，时间戳打印在用户输入区域内，当前代码如下

$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)))."\n";

输出如下

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\";} 

有谁能帮我得到一个时间戳出现的输出，如下图所示

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 \";} 

试一试

这不是正确的序列化字符串

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

上面的代码首先生成数组，然后将其序列化，使其看起来像：

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\"}}

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我已经试过了，这没什么区别。。它仍然在花括号内（或用户输入）

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

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\"}}