Description:
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Mysql ignores the IS NULL in the WHERE statement when the query is executed from php.

In the example I give, the AddressID is auto_increment primary key.  As you can see from the output, the address ID gets a value of 65 for the inserted row.  I then DELETE WHERE AddressID IS NULL and the row is removed.  It will also return the row when I execute SELECT * FROM Address WHERE AddressID IS NULL.

It happens in with mysql_query, PDO::exec() or PDO::query() and with or without ` around the table name.

Reproduce code:
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//PHP 5.2.9 on Hostmonster.com
mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
mysql_select_db(DB_NAME);
mysql_query("INSERT INTO `Address` (StreetAddress) VALUES ('blah')");
$result = mysql_query("SELECT * FROM `Address`");
while($row = mysql_fetch_assoc($result)){
	print_r($row);
}

mysql_query("DELETE FROM `Address` WHERE `AddressID` IS NULL");

$result = mysql_query("SELECT * FROM `Address`");
while($row = mysql_fetch_assoc($result)){
	print_r($row);
}

Expected result:
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Array ( [AddressID] => 65 [NameOrCompany] => [StreetAddress] => blah [City] => [State] => [Zip] => [Country] => [DateTimeCreated] => [DateTimeModified] => ) Array ( [AddressID] => 65 [NameOrCompany] => [StreetAddress] => blah [City] => [State] => [Zip] => [Country] => [DateTimeCreated] => [DateTimeModified] => ) 

Actual result:
--------------
Array ( [AddressID] => 65 [NameOrCompany] => [StreetAddress] => blah [City] => [State] => [Zip] => [Country] => [DateTimeCreated] => [DateTimeModified] => )