Difference between revisions of "Database Programmering"
From Teknologisk videncenter
| Line 62: | Line 62: | ||
} | } | ||
?> | ?> | ||
| + | </source> | ||
| + | Session Variables (Mere Info: [https://www.w3schools.com/php/php_sessions.asp Sessions]) | ||
| + | <source lang="php"> | ||
| + | <!--Script1.php, Setting a session variable --> | ||
| + | <?php | ||
| + | session_start(); //Must be in every script that uses session variables | ||
| + | |||
| + | $_SESSION["abc"] = "dfg"; | ||
| + | ?> | ||
| + | |||
| + | <!--Script2.php, Using a session variable --> | ||
| + | <?php | ||
| + | session_start(); | ||
| + | |||
| + | echo $_SESSION["abc"]; //outputs "dfg" | ||
| + | ?> | ||
| + | |||
| + | <!--Script3.php, Stopping a session --> | ||
| + | <?php | ||
| + | session_start(); | ||
| + | |||
| + | session_unset(); | ||
| + | session_destroy(); | ||
| + | |||
| + | echo $_SESSION["abc"]; //This line will now give error | ||
| + | ?> | ||
</source> | </source> | ||
Revision as of 14:09, 5 December 2017
Forberedelse til Mandag
Hav XAMPP klar på jeres computer. XAMPP kan downloades her https://www.apachefriends.org/index.html
Opgave
Bruger Database (navn og password)
En side til oprettelse af brugere
En side til at verificere et login
Et backup system i json
Eksempler
JSON (Mere info: json_encode og json_decode)
<?php
class MyClass {
public $name = "Mads";
public $age = 27;
public $awesome = TRUE;
}
$mads = new MyClass();
$json = json_encode($mads);
//{"name":"Mads","age":27,"awesome":true}
$newMads = json_decode($json);
echo $newMads->$name;
?>
Saving a File (simple, Mere Info: file_get_contents og file_put_contents)
<?php
file_put_contents("myFile.txt", "PHP is used for Server-Side Applications");
echo file_get_contents("myFile.txt");
?>
Saving a File (full, Mere Info: fopen, fwrite og fread)
<?php
$filename = "myFile.txt";
$handle = fopen($filename, 'w');
fwrite($handle, "Now we have far more control!");
fclose($handle);
$handle = fopen($filename, 'r');
echo "File Says:\n";
echo fread($handle, filesize($filename));
fclose($handle);
?>
Password Hashing (Mere Info: password_hash og password_verify)
<?php
$st = "madsbock";
echo $st . "<br>";
$hash = password_hash($st, PASSWORD_DEFAULT);
echo $hash . "<br>";
if(password_verify($st, $hash)) {
echo "Access Granted";
} else {
echo "Access Denied";
}
?>
Session Variables (Mere Info: Sessions)
<!--Script1.php, Setting a session variable -->
<?php
session_start(); //Must be in every script that uses session variables
$_SESSION["abc"] = "dfg";
?>
<!--Script2.php, Using a session variable -->
<?php
session_start();
echo $_SESSION["abc"]; //outputs "dfg"
?>
<!--Script3.php, Stopping a session -->
<?php
session_start();
session_unset();
session_destroy();
echo $_SESSION["abc"]; //This line will now give error
?>