Description:
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I'm using PHP 5.3.14, but I believe that the mssql extension has not been updated for a while.

Description: mssql_close($link) doesn't seem to close the $link (and perhaps NULL the $link variable), but mssql_close() does close the last opened link. In the test script I have made an example.

Test script:
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MSSQL_SERVERNAME, MSSQL_USERNAME, MSSQL_PASSWORD are constants with the real parameters.

Example (it works):
===================

Code:

var_dump(mssql_connect(MSSQL_SERVERNAME, MSSQL_USERNAME, MSSQL_PASSWORD));

var_dump(mssql_close());

$f = mssql_fetch_assoc(mssql_query("select getdate();"));

var_dump($f);

Output:

resource(2) of type (mssql link)
bool(true)
NULL

Example (it doesn't work as expected):
======================================

Code:

var_dump($c = mssql_connect(MSSQL_SERVERNAME, MSSQL_USERNAME, MSSQL_PASSWORD));

var_dump(mssql_close($c));

$f = mssql_fetch_assoc(mssql_query("select getdate();", $c));

var_dump($f);

Output:

resource(2) of type (mssql link)
bool(true)
array(1) {
  'computed' =>
  string(26) "Aug  6 2014 05:18:37:883PM"
}

I believe that it shouldn't have made the query (in fact, mssql_close($c) has returned true, so the link should be closed).

Can I give you further further information?

Best regards,