<?php
$text = $_POST["text"];
$select = $_POST["select"];
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "Studenci";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
if($select=="*")
{
    $sql = "SELECT * FROM Studenci";
}
if($select=="imie")
{
    $sql = "SELECT id, imie, nazwisko FROM Studenci WHERE imie='" . $text . "'";
}
if($select=="nazwisko")
{
    $sql = "SELECT id, imie, nazwisko FROM Studenci WHERE nazwisko='" . $text . "'";
}


$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Imie: " . $row["imie"]. " - Nazwisko: " . $row["nazwisko"]. "<br>";
    }
} else {
    echo "0 wyników";
}
$conn->close();
?>