问题
if(mysql_num_rows($result))
{
echo \"no match found!\";
}
it is throwing an error-
Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in D:\\Hosting\\6448289\\html\\includes\\getQuestion.php on line 72
回答1:
You need to check the return value of mysql_query
$query = 'YOUR QUERY';
$result = mysql_query($query);
if (!$result) {
trigger_error('Invalid query: ' . mysql_error()." in ".$query);
}
// go ahead and fetch the results using mysql_num_rows.
If mysql_query fails it returns boolean false instead of a resource.
When you pass this boolean value to mysql_num_rows you get this error.
来源：https://stackoverflow.com/questions/3698740/mysql-num-rows-supplied-argument-is-not-a-valid-mysql-result-resource