Description:
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1. Constant LINK is set. 
2. In a file login.php before function "auth" I check that constant LINK exists: 
resource (4) of type (mysql link) 
3. Function "auth" from a file login.php is started. 
4. In the function beginning I check that constant LINK exists: resource (4) of type (mysql link)
5. I close connection mysql_close(LINK);
6. After mysql_close(LINK) I check that constant LINK exists: 
a constant is damaged: resource (4) of type (Unknown).

Reproduce code:
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configdb.php
define ('DBHOST', "localhost");
define ('DBUSER', "root");
define ('DBPASSWORD', "xxxxx");
define ('DBNAME', "base1");
define ('LINK', mysql_connect(DBHOST, DBUSER,DBPASSWORD));
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login.php
var_dump(LINK); // resource(4) of type (mysql link)
if (isset($_POST["confirmForm"]) && !empty($_POST["confirmForm"])){
	auth($_POST["nameForm"], $_POST["passwordForm"]);}
var_dump(LINK);// resource(4) of type (Unknown)
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lib.php
function auth($name, $password){
    var_dump(LINK); // resource(4) of type (mysql link)
    $query = "select count(*) from Names where name='$name' and password=MD5('$password')";
    $result=mysql_query($query, LINK);
    $row=mysql_fetch_array($result);
  resource(4) of type (mysql link)
    mysql_close(LINK);
    var_dump(LINK);// resource(4) of type (Unknown)}


Expected result:
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I want that constant LINK did not change after mysql_close(LINK).
I want that after run mysql_close(LINK): resource(4) of type (mysql link)

Actual result:
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resource(4) of type (Unknown)