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    <p>Use <a href="http://php.net/mysql_pconnect/" rel="nofollow noreferrer"><code>mysql_pconnect</code></a>, that will do what you want.</p> <blockquote> <p>First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.</p> </blockquote> <p>You could also use a static or singleton class to handle connection pooling for you.</p> <pre><code>&lt;?php class dbConnectionPooler { static var $connections = array(); private static function createConnection($host, $username, $password, $db) { $connection = mysql_pconnect($host, $username, $password); if (FALSE !== $connection) { $result = mysql_select_db($db, $connection); if (FALSE !== $result) { self::$connections[self::getConnectionHash($host, $username, $password, $db)] = $connection; return $connection; } } } private static function getConnectionHash($host, $username, $password, $db) { return md5($host. $username. $password. $db); // use your favourite hashing function here } public static function getConnection($host, $username, $password, $db) { $connectionHash = self::getConnectionHash($host, $username, $password, $db); if (array_key_exists($connectionHash, self::$connections)) { return self::$connections[$connectionHash]; } else { return self::createConnection($host, $username, $password, $db); } return false; } } $connection = dbConnectionPooler::getConnection("dbhost", "dbuser", "dbpassword", "mydb"); ?&gt; </code></pre>
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    1. POPHP: How Do I Get a MySQL Link Identifier For an Already Open Connection?
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    1. COI don't think that's actually what they want - I think they're wanting to open a db connection to a different server, but *not* overwrite any existing "current last opened db resource" that a script which includes their plugin might have been relying on.
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    2. COAs I understand it, the original question was "How can I reuse a previously opened DB connection, without explicitly recording the connection identifier". If I'm wrong, then I am, but that's how I see it.
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    3. COAh, I see now that you're correct. However, mysql_pconnect will still do what is requested, since it identifies connections according to host, username and password. If you need to include the database into the "uniqueness", you're better off using a custom class for connection pooling, as I suggested. I can't really see why I got a downvote.
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