Description:
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When binding to a named placeholder in a prepared-statement using mysql-5.0.24-r1 causes unpredictable behaviour.
With PHP 5.1.4 the query goes correct.

Reproduce code:
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<?php

$dbh = new PDO('mysql:host=localhost;dbname=mysql', 'root', 'pwd');

$query1 = "SELECT * FROM user WHERE User=:user AND Host IN (SELECT Host FROM user WHERE User=:user)";
$query2 = "SELECT * FROM user WHERE Host IN (SELECT Host FROM user WHERE User=:user) AND User=:user";

$stm1 = $dbh->prepare($query1);
$stm1->bindValue(':user', 'root');
$stm1->execute();
print count($stm1->fetchAll()).'<br>';

$stm2 = $dbh->prepare($query2);
$stm2->bindValue(':user', 'root');
$stm2->execute();
print count($stm2->fetchAll()).'<br>';


Expected result:
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Should return: (like it does using the command-line-client)

2
2

Actual result:
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It returns:

2
6