Verifying the values from database - php

Question

I'm quite new to mysql tables and I know I should use PDO or mysqli, but this is just an example for school.
Here's my problematic code:
while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) {
if ($uporab != $row['uporabnisko'] || $pass != $row['geslo']){
echo '<script language="javascript">';
echo 'alert("Uporabnisko ime ali geslo ni pravilno! Prosim poskusi znova.")';
echo '</script>';
header('Location: index1.php');
}
else{
header('Location: Stranzaindexom.html');
}
}
When I use "while" I get error popped out 5 times (I think it depends on how many values are in table in database), but when I don't use while, than I get checked just first id (first row) in table.. I checked for other answers but I haven't found the proper one..
Any help?
PS: connection to the database is successful, and taking values of table is good to.. So my problems just lay somewhere here.

Answer 1

May be you can try this
Why do we need to select all the records and check all the records the best is to pull only that record which is necessary.
$result = mysql_query("SELECT * name FROM usertable WHERE uporabnisko='$uporab' AND geslo = '$pass'");
if($row = mysql_fetch_array($result, MYSQL_ASSOC))
{
echo '<script language="javascript">';
echo 'alert("Uporabnisko ime ali geslo ni pravilno! Prosim poskusi znova.")';
echo '</script>';
echo "<script language='javascript'> window.location='index1.php'; </script>";
}
else
{
echo "<script language='javascript'> window.location='Stranzaindexom.html'; </script>";
}

Answer 2

Think reverse check the positive case and give the alert on else like:
if ($uporab == $row['uporabnisko'] && $pass == $row['geslo']){
header('Location: Stranzaindexom.html');
exit();
} else {
echo '<script language="javascript">';
echo 'alert("Uporabnisko ime ali geslo ni pravilno! Prosim poskusi znova.")';
echo '</script>';
}
Or use the username and password at the sql and give limit 1 so you dont need a while becouse it garanteus that result set will be 1 row or 0 row:
mysql_query("SELECT * FROM users WHERE username='".$escapedUsername."' AND password='".$escapedPassword."' LIMIT 1");