error with query REPLACE using mysql PDO - replace

Question

I try to execute the following mysql query with pdo
REPLACE INTO session SET id = :id, user_id = :user_id, data = :data, timestamp = :timestamp
and I get the following error:
[18-Sep-2014 11:48:10] Exception Message: Unhandled Exception.
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?, data = ?, timestamp = ?' at line 1.
You can find the error back in the log.:
Query:REPLACE INTO session SET id = :id, user_id = :user_id, data = :data, timestamp = :timestamp
Params:
Array
(
[id] => sv9o264ciicsfd8porp1v0gl46
[user_id] => 0
[data] => version|s:8:"computer";linkedin|a:1:{s:5:"state";s:7:"Q7HXzKo";}github|a:1:{s:5:"state";s:7:"Q7HXzKo";}
[timestamp] => 1411030090
)
My Table session structure is:
CREATE TABLE IF NOT EXISTS `session` (
`id` varchar(255) COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
`user_id` mediumint(10) NOT NULL,
`data` text COLLATE utf8_unicode_ci NOT NULL,
`timestamp` int(40) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
UNIQUE KEY `session` (`id`),
UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
When I use phpmyadmin to execute it is working fine.
Can you help me to understand what is the problem?

Answer 1

well I found it, very silly mistake: I should separate the , from the parameter:
I changed this
:user_id,
to:
:user_id ,

Answer 2

You have forgotten an equal sign.
Change this part of your query:
user_id :user_id
to:
user_id = :user_id
I also think there may be a problem in using a reserved keyword like timestamp for one of your columns, try changing it to something like tstamp. You could also try to quote the name in the query.
REPLACE INTO session SET `id` = :id, `user_id` = :user_id, `data` = :data, `timestamp` = :timestamp