Description:
------------
Whem Mysql closes created by mysql_pconnect() peristent connection, file descriptor lefts opened and is never reused.
I have a server that stops working due to opened file descriptors limit.

Test script:
---------------
<?php

function connect($passwd) {
   $conn = mysql_pconnect('localhost:3306','root', $passwd);
   if (!$conn)
      die(mysql_error()."\n");
   mysql_query("set wait_timeout=5", $conn);
   return $conn;
}

$passwd = $argv[1];
$conn = connect($passwd);

for($i=0;$i<10;$i++) {
   /* wait while mysql closes connection */
   sleep(6);

   if (!mysql_ping($conn)) {
      echo "reconnect\n";
      $conn = connect($passwd);
   }

   $r = mysql_query('select 1', $conn);
   $error = $r ? 'OK' : mysql_error();
   $opened_files = trim(exec("lsof -np " . getmypid() . " | wc -l"));
   echo "$error. opened files: $opened_files\n";
}

?>


Expected result:
----------------
$ php ./test.php
reconnect
OK. opened files: 76
reconnect
OK. opened files: 76
reconnect
OK. opened files: 76
reconnect
OK. opened files: 76
...

Actual result:
--------------
$ php ./test.php
reconnect
OK. opened files: 76
reconnect
OK. opened files: 77
reconnect
OK. opened files: 78
reconnect
OK. opened files: 79
...