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I am getting a  'Call to undefined function: msql_num_rows()'

I want to trap an error where there are no records

$sql = "SELECT * FROM Accounts WHERE USR = '" . $USR . "' AND PWD = '" . $PWD . "'";
$qAccess = mysql_query($sql) or die(mysql_error());
echo msql_num_rows($qAccess);

I have searched the documentation but not found any examples.

Desmond.
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