Keskustelu: Nettisivujen teko: Olio-ohjelmointi PHP:llä

<?php
class Firma {
  private $henkilosto = array();
  public function lisaa(Henkilo $h) {
    $this->poista($h);
    $this->henkilosto[] = $h;
  }
  public function poista(Henkilo $h) {
    $i = array_search($h, $this->henkilosto);
    if ($i !== false) {
      unset($this->henkilosto[$i]);
    }
  }
}

$pekka = new Henkilo("Pekka");
$paavo = new Henkilo("Paavo");
$ab_koodipaja_oy = new Firma();

// Uusia työntekijöitä...
$ab_koodipaja_oy->lisaa($pekka);
$ab_koodipaja_oy->lisaa($paavo);

// Annetaan potkut.
$ab_koodipaja_oy->poista($pekka);

<?php
class Tyopaikka {
	public $tyontekijat;
	public function __construct($firma) {
		echo "<h3>Firman $firma henkilöstö:</h3>\n";
	}

	public function Henkilo($nimi, $osoite, $email, $kokemus, $ika) {
		$tyontekijat[] = "$nimi, $osoite, $email, $kokemus, $ika";
	}

	public function Tyontekijat() {
		for($i = 0; $i < sizeof($tyontekijat); $i++) {
			$tyontekijatiedot = explode(", ", $tyontekijat[$i]);

			echo $tyontekijatiedot[0] . ":\n<ul>\n";
			echo "Osoite: ", $tyontekijatiedot[1], "<br>\n";
			echo "Sähköposti: ", $tyontekijatiedot[2], "<br>\n";
			echo "Kokemus: ", $tyontekijatiedot[3], "<br>\n";
			echo "Ikä: ", $tyontekijatiedot[4], "<br>\n";
			echo "</ul>\n";
		}
	}
}

$firma = new Tyopaikka("HS");
$martti = $firma->Henkilo('Martti', 'Ohjelmointikuja 2', 'martti.ohjelmoija@ol.fi', 'Pajulahden sanomat', 56);
$tyontekijat = $firma->Tyontekijat();
?>

<?php
class Yritys{
	private $_tyontekijat;

	public function lisaa_duunari(Tyontekija $tyontekija){
		$this->_tyontekijat[] = $tyontekija;
	}

	public function laske_palkat(){
		$tmp_palkka = 0;

		for($a = 0; $a < count($this->tyontekijat); $a++){
			$tmp_palkka += $this->_tyontekijat[$a]->anna_palkka();
		}

		return $tmp_palkka;
	}
};

class Tyontekija{
	private $_etunimi;
	private $_sukunimi;
	private $_osasto;
	private $_palkka;

	public function __construct($en, $sn, $os, $pa){
		$this->_etunimi = $en;
		$this->_sukunimi = $sn;
		$this->_osasto = $os;
		$this->_palkka = $pa;
	}

	public function anna_nimi(){
		return ($this->_etunimi . " " . $this->_sukunimi);
	}

	public function anna_palkka(){
		return $this->_palkka;
	}
};

$duunarit = file("tt.txt");
$kpl = count($duunarit);

$firma = new Yritys();

for($a = 0; $a < $kpl; $a++){
	$tiedot = explode("|", $duunarit[$a]);
	$en = $tiedot[1];
	$sn = $tiedot[2];
	$os = $tiedot[3];
	$pa = $tiedot[4];

	$tmp_duunari = new Tyontekija($en, $sn, $os, $pa);

	$firma->lisaa_duunari($tmp_duunari);
}

echo "palkat yhteensä = " . $firma->laske_palkat();
?>

<?php
// Start the session
session_start();
// ob_start() is required if the page is printed from the text before headers
ob_start();

// Login class
class LoginForm {
	private $users_table, $username_field, $password_field, $main_page, $password, $username, $yhteys, $session_table;
	// Connecting to database, when start the script
	public function __construct($server, $user, $password, $database) {
		//Try to connect, exceptions trow error
		$this->yhteys = mysql_connect($server, $user, $password) or die("Problems with connecting to database.");
		mysql_select_db($database) or die("Can't connect to database $database!");
	}

	// Settings
	public function Settings($user_table, $username_field, $password_field, $header_page, $session_table) {
		$this->users_table = $user_table;
		$this->username_field = $username_field;
		$this->password_field = $password_field;
		$this->main_page = $header_page;
		$this->session_table = $session_table;
	}

	// The login form generating
	public function Return_login_form() {
		// Return the structure of the form
		echo "<table>\n";
		echo "<form action=\"?login\" method=\"POST\">\n";
		echo "<tr><td>Tunnus:</td><td>Salasana:</td></tr>\n";
		echo "<tr><td><input type=\"text\" name=\"tunnus\"></td><td><input type=\"password\" name=\"salasana\"></td></tr>\n";
		echo "<tr><td><input type=\"submit\" value=\"Kirjaudu\"></td></tr>\n";
		echo "</form>\n</table>\n";
		}

	// Called when get ?login
	public function Check_login() {
		if(isset($_GET["login"])) {
			// Take username and password
			$username = $_POST["tunnus"];
			$password = $_POST["salasana"];

			// Check that the username and password have been met
			if(strlen($username) > 0) {
				if(strlen($password) > 0) {
					$password = md5($password);

					// Check, if there is this user
					$query = mysql_query("SELECT * FROM " . $this->users_table . " WHERE " . $this->username_field . " = '$username' AND " . $this->password_field . " = '$password'")  or die("MySQL Error: Problem with query in login_class.php: " . mysql_error());
					if(mysql_num_rows($query) == 1) {
						// Username and password was right
						// Rand and crypt id
						$id = md5(uniqid(""));

						// Put it in a session
						$_SESSION["id"] = $id;
						// Update it to the database too
						mysql_query("UPDATE " . $this->users_table . " SET " . $this->session_table . " = '$id' WHERE " . $this->username_field . " = '$username' AND " . $this->password_field . " = '$password'") or die("MySQL Error: Problem with query in login_class.php: " . mysql_error());

						// Let's go to the main page
						header("Location: " . $this->main_page);
						die;
					} else {
						// Username or password was wrong
						header("Location: " . $_SERVER["PHP_SELF"] . "?error_id=1");
						die;
					}
				} else {
					// Password field was empty
					header("Location: " . $_SERVER["PHP_SELF"] . "?error_id=2");
					die;
				}
			} else {
				// Username field was empty
				header("Location: " . $_SERVER["PHP_SELF"] . "?error_id=3");
				die;
			}
		}

		// If we got an error
		if(isset($_GET["error_id"])) {
			// Errors:
			// error_id=1: Username or password was wrong
			// error_id=2: Password field was empty
			// error_id=3: Username field was empty

			$error_id = $_GET["error_id"];
			if($error_id == 1) {
				// error_id == 1
				echo "Virhe: Tunnus tai salasana oli väärin!";
			} else if($error_id == 2) {
				// error_id == 2
				echo "Virhe: Anna salasana";
			} else if($error_id == 3) {
				// error_id == 3
				echo "Virhe: Anna tunnus!";
			} else {
				// Exception: Unknown error_id
				echo "Virheellinen error_id!";
			}
		}

		// If the user's browser direction is like ?logout
		if(isset($_GET["logout"])) {
			// Unset id-session
			unset($_SESSION["id"]);
			session_destroy();

			// Navigating to the main page
			header("Location: " . $this->main_page);
			die;
		}

		// If the user have got the right session
		if(isset($_SESSION["id"])) {
			// Has logged in
			$session_id = $_SESSION["id"];

			// Make a query, and check if theres a user with this id
			$query = mysql_query("SELECT * FROM " . $this->users_table . " WHERE " . $this->session_table . " = '$session_id'") or die("MySQL Error: Problem with query in login_class.php: " . mysql_error());
			if(mysql_num_rows($query) == 1) {
				//$this->user[] includes all information about user
				$this->user = mysql_fetch_array($query);
			}
		}
	}
}
?>

*** Käyttöesimerkki
<?php
// Jokaisen sivun alussa pitää sisällyttä login_class.php
include("login_class.php");

// Luodaan uusi lomake. Sarakkeet: MySQL serveri, tunnus, salasana, tietokanta
$log = new LoginForm("localhost", "root", "7bvna378", "test");

// Asetukset: Käyttäjätaulu, käyttäjäsarake, salasanasarake, sivu jonne mennää kirjautumisen jälkeen,
// sarakkeen nimi jossa istunnon id sijaitsee
$log->Settings("users", "tunnus", "salasana", "login_page.php", "session");

// Tarkistetaan tunnukset
$log->Check_login();

if($log->user)
	// On kirjauduttu, tulostetaan tervehdys
	echo "Hei {$log->user["tunnus"]}! <a href=\"?logout\">Kirjaudu ulos</a>";
else
	// Tulostetaan kirjautumislomake
	$log->Return_login_form();
?>