Description:
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using mysqli with a non-standart port, like 3307, it looses the database connection. i'm not sure if this happens only when using multiple instances of mysqli.

the mysql server is fine, it must be a php problem/bug!!

Reproduce code:
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$a = new mysqli('127.0.0.1','test1','abc','test1',3307);
if (mysqli_connect_errno()) die("connect: failed with '".mysqli_connect_error()."'!");
printf("Host information: %s\n", $a->host_info);
$r = $a->query('SHOW TABLES');
while ($v=$r->fetch_assoc()) print_r($v);

$b = new mysqli('127.0.0.1','test2','abc','test2',3307);
if (mysqli_connect_errno()) die("connect: failed with '".mysqli_connect_error()."'!");
printf("Host information: %s\n", $b->host_info);
$r = $b->query('SHOW TABLES');
while ($v=$r->fetch_assoc()) print_r($v);

--

$a = new mysqli('127.0.0.1','test1','abc','test1',3306);
if (mysqli_connect_errno()) die("connect: failed with '".mysqli_connect_error()."'!");
printf("Host information: %s\n", $a->host_info);
$r = $a->query('SHOW TABLES');
while ($v=$r->fetch_assoc()) print_r($v);

$b = new mysqli('127.0.0.1','test2','abc','test2',3306);
if (mysqli_connect_errno()) die("connect: failed with '".mysqli_connect_error()."'!");
printf("Host information: %s\n", $b->host_info);
$r = $b->query('SHOW TABLES');
while ($v=$r->fetch_assoc()) print_r($v);


Expected result:
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in both cases something like 

Host information: 127.0.0.1 via TCP/IP Array (...) Host information: 127.0.0.1 via TCP/IP Array (...)

Actual result:
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Warning: mysqli::mysqli() [function.mysqli]: Lost connection to MySQL server during query in /test/mysqli.php on line 2
connect: failed with 'Lost connection to MySQL server during query'!