Does PDO::PARAM_STR filters the input from user?

Dear experts,

The I was using the PDO function from php with prepare statements.

I have an input string like this: 'UPDATE tbl_1 Set city = :city and id = :id';

$city = 'Mongo';
$id = 3;
I've also have my bindParam() like this: bindParam(':city', $city, PDO::PARAM_STR);
and bindParam(':id', $id, PDO::PARAM_INT);

somehow I changed the PDO::PARAM_STR into PDO::PARAM_INT for bindParam(':city', $city, PDO::PARAM_STR) and the result from $city still works. I am wondering what does the PDO::PARAM_STR or the PDO::PARAM_INT do because it is not filtering out the input for me.  Thanks.
Kinderly WadeprogrammerAsked:
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GaryCommented:
If you pass it a string and tell it it's a number then it will know it's string and quote it anyway.
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Ray PaseurCommented:
Quoted numbers do no harm.  Unquoted strings are not so good.  But PDO does not really do "quoting" like we do when we use other MySQL extensions.  And PDO does nothing to filter input - that is the programmer's responsibility.  Accept Only Known Good Values.  All PDO does is prevent bad query strings from causing the MySQL engine to bark or belch out the wrong data.

The general way to handle PDO parameterization is given in this article.  See PDO - Prepare a Query
http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html
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Kinderly WadeprogrammerAuthor Commented:
Thanks Ray. You nailed the question right on the spot.
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Ray PaseurCommented:
Thanks for the points -- it's a very worthwhile question, ~Ray
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