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[Memcache] Login question

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Hello everyone,

I have a couple of questions about Memcache. What I want to do is using memcache for user login, so when a user logs in, a memcache variable (array) is created. Here's the function:

[code]function login( $sUsername, $sPassword )
    $oMemcache = clsMem::getMem();
    if( $oMemcache->get( md5( $sUsername ) ) == "" )
        $oSql = new Mysql();
        $oSql->query( "SELECT id, username, permissions FROM users WHERE username = '" . $sUsername . "' AND password = '" . md5( $sPassword ) . "'" );
        if( $oSql->fetchNumRows() == 1 )
            $aUserInfo = $oSql->fetchArray( MYSQL_ASSOC );
            $oMemcache->set( md5( $sUsername ), $aUserInfo, false, 0 );
            $_SESSION[ "username" ] = md5( $sUsername );

Now my questions;

1. Is Memcache safe enough to use it for user login?
2. Is this faster than getting information from the database directly?

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