TalkPHP - mysql_num_rows(): supplied argument is not a valid MySQL result resource

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mysql_num_rows(): supplied argument is not a valid MySQL result resource

Hey guys,
I was working through the tutorial on creating registration page. On Activation PHP went through the coding error:
Mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/content/68/9152261/html/activation.php on line 16.

Tried different variation nothing works... so frustrated. I thought professional opinion would help to find a problem. Please help!!! Here is the code:

<?php
if($_GET['id']!=""){
include_once "connect_to_mysql.php";

$id = $_GET['id'];
$hashpass = $_GET['sequence'];

$id = mysql_real_escape_string($id);
$id = eregi_replace("`", "", $id);

$hashpass = mysql_real_escape_string($hashpass);
$hashpass = eregi_replace("`", "",$hashpass);

$sql = mysql_query("UPDATE members SET email_activated='1' WHERE id='$id' AND password='$hashpass'");
$sql_doublecheck = mysql_query("SELECT * FROM members WHERE id='$id' AND password='$hashpass' AND email_activated='1'");
$doublecheck = mysql_num_rows($sql_doublecheck);

if($doublecheck == 0){
$msgToNewMember = "<h3>Your account could not be activated</h3> 
Please contact us regarding your activation via email";
include 'msgToNewMember.php';
exit();
} else if($doublecheck>0) {
$msgToNewMember = " You successfully activated your account! 
Now you can login to your account.<h3>";
include 'msgToNewMember.php';
exit();
}
}

print "Essential part from activation link is missing! Please copy full activation link that was supplied in our email to you and paste it in a new browser address bar. Thank you!

";

?>

Thank you very much!

You need to be handling errors to get to the bottom of your problem...

PHP Code:


		
			
$sql = mysql_query("UPDATE members SET email_activated='1' WHERE id='$id' AND password='$hashpass'");
$sql_doublecheck = mysql_query("SELECT * FROM members WHERE id='$id' AND password='$hashpass' AND email_activated='1'");
$doublecheck = mysql_num_rows($sql_doublecheck);

PHP Code:


		
			
$sql = mysql_query("UPDATE members SET email_activated='1' WHERE id='$id' AND password='$hashpass'");

if (!$sql){
echo "Error with update query : " . mysql_error();
}

$sql_doublecheck = mysql_query("SELECT * FROM members WHERE id='$id' AND password='$hashpass' AND email_activated='1'");

if (!$sql_doublecheck){
echo "Error in double check : " . mysql_error();
}else{
$doublecheck = mysql_num_rows($sql_doublecheck);
}

Seems like main problem is solved. Although "Your account could not be activated" message poping up. I guess I need to get through it all over again. Thank you Simon very much!