How to modify a mysql_pconnect function in order to count queries
$hostname = "localhost";
$database = "listings";
$username = "joe";
$password = "1234";

$my_connection = mysql_pconnect($hostname, $username, $password) or trigger_error(mysql_error(),E_USER_ERROR);

class MySQLWrapper
{

private $_link;
private $_totalQueries;

/**
* Connects to the database server
*
* @param string $hostname
* @param string $username
* @param string $password
*
*/
public function connect($hostname, $username, $password) {
     if (is_null($this->_link)) {
         $this->_link = mysql_pconnect($hostname, $username, $password);
     }
}

/**
* Performs query
*
* @param string $sql
* @return resource
*/
public function query($sql) {
    $this->_totalQueries++;
    return mysql_query($sql, $this->_link);
}

/**
* Returns count of queries made
* @return int
*/
public function getTotalQueryCount() {
    return $this->_totalQueries;
}
}