Description:
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PDO_MySQL does not respect type of binded params that are used more than once in query. 

Test script:
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<?php
$DB = new PDO("mysql:host=localhost", "root", "");
$statement = $DB->prepare("SELECT SLEEP(50), :bind, :bind");
$bind = 1;
$statement->bindParam(":bind", $bind, PDO::PARAM_INT);
$statement->execute();

Expected result:
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SELECT SLEEP(50), 1, 1

Actual result:
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If you review SHOW PROCESSLIST while test script is waiting for response, you'll see SELECT SLEEP(50), 1, '1' instead of expected result.