<?php

$link = mysql_connect("localhost","root","");
$select_db = mysql_select_db("iniection", $link);
$query = "SELECT * FROM user WHERE username='".$_POST['username']."' AND password='".$_POST['password']."'";

echo "Wykonane zapytanie:".$query;
$result = mysql_query($query);
$rows= mysql_num_rows($result);

if ($rows>0)
{
    while ($row = mysql_fetch_array($result))
    {
        echo "<br><br>id:".$row['id']."<br>";
        echo "username:".$row['username']."<br>";
        echo "password:".$row['password']."<br>";
    }

}
else echo "not found";