PHP检查查询是否返回任何错误

Question

I've been pondering about this for a while, I'm trying to see if the query wields any results and I want to do something if it doesn't return any results.

PHP:

<?php
session_start();
$host = "localhost";
$user = "root";
$passw = "";
$con = mysql_connect($host, $user, $passw);


if (!$con)
{
    die('Could not connect: ' . mysql_error());
}
$json = $_REQUEST['json'];
$json = stripslashes($json);
$jsonobj = json_decode($json);

$me = $jsonobj -> me;
$other = $jsonobj -> other;
mysql_select_db("tinyspace", $con);
$result = mysql_query("SELECT * FROM friends WHERE (user_id = '" .$me. "' AND user_id2 = '" .$other. "') OR (user_id2 = '" .$me. "' AND user_id1 = '" .$other. "')");

if(mysql_num_rows($result) > 0)
{

}

the if statement keeps giving me problems however.
Any Advice?

Answer 1

you should try

<?php 
if($result == false){
   //what you want to do if the query returns nothing
}else{
   //handle the result
}

for those who think my answer is incorrect or the opposite of what is asked, please read the question from the beginning again, very carefully.