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how to login a user after he is registered


asdfghjkl

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......
mysql_connect (localhost , $username ) or die ( mysql_error()) ;
mysql_select_db ( $database) or die (mysql_error()) ;
$query =mysql_query( "select *from $tbl where username='$username1' and password='$password' ");
if ( !$query )
{
echo " I am closing the connection " ;
exit ;
}
else
{
mysql_fetch_array($query) ;
echo "Welcome" ;
}

i am connected to the database have the username and password signed ,
builded the mysql_query and now i am trying to if the username and password are not correct then destroy
, otherwise print "Welcome "
will you guide me ?
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