php - Beginner trouble updating records PDO -

i have read lot of articles/blogs cannot find wrong. trying update records using pdo when press send nothing happens, no error, , not work.

php:

$stmt = $conn->prepare('update products set name = :name id = :id'); $stmt->bindvalue(':id', $_post['id'], pdo::param_int); $stmt->bindvalue(':name', $_post['name'], pdo::param_str); $stmt->execute(); 

html:

<form name="prodform" class="pure-form pure-form-aligned" method="post">   <input name="name" type="text" value="<?php echo $data['nome']; ?>">   <input name="id" type="hidden" value="<?php echo $data['id']; ?>">   <input name="send" type="submit" value="send"> </form> 

it seems found way make work don't know why works this. changed input name different 1 , worked magic, don't know why if use:
value="<?php echo $data['name'];?>" name="name" doesn't work if this:
value="<?php echo $data['name'];?>" name="anyname" works.