PHP-mysql_num_rows（）希望参数1是资源
如何检查PHP-mysql_num_rows（）希望参数1是资源,php,mysql,Php,Mysql,如何检查$result是否为空，然后再获取mysql_num_rows的结果？您可以使用三元运算符检查$result，如果$noOfRows为假，则将$noOfRows设置为0： $query = "SELECT * FROM XXXX"; $result = mysql_query($query); $noOfRows = mysql_num_rows($result); 请注意，mysql\uuu扩展已被弃用- $query = "SELECT * FROM XXXX"; $result
$resultmysql_num_rows$result$noOfRows$noOfRows0$query = "SELECT * FROM XXXX";
$result = mysql_query($query);
$noOfRows = mysql_num_rows($result);
请注意，
mysql\uuu$query = "SELECT * FROM XXXX";
$result = mysql_query($query);
$noOfRows = (false===$result)? 0 : mysql_num_rows($result);