Först och främst bör din PHP- eller HTML-sida skapa ett formulär som användaren kan interagera med. I den mest enkla formen skulle det vara något i stil med:
<html>
<body>
<form method="post" action="yourscript.php">
<input type="text" name="yourfield">
<input type="submit" name="youraction" value="save">
</form>
</body>
</html>
Detta kommer att ge din användare ett enkelt formulär med ett enda inmatningsfält och 'spara'-knapp. Efter att ha klickat på "spara"-knappen kommer innehåll att skickas till ditt "dittscript.php" med POST metod.
yourscript.php bör implementera följande:
- Acceptera och bearbeta indata från ditt formulär.
- Anslut till din MySQL-databas.
- Lagra i databasen.
I den mest förenklade formen skulle detta vara:
<!doctype html>
<html>
<head>
<title>Process and store</title>
</head>
<body>
<?php
// Check that user sent some data to begin with.
if (isset($_REQUEST['yourfield'])) {
/* Sanitize input. Trust *nothing* sent by the client.
* When possible use whitelisting, only allow characters that you know
* are needed. If username must contain only alphanumeric characters,
* without puntation, then you should not accept anything else.
* For more details, see: https://stackoverflow.com/a/10094315
*/
$yourfield=preg_replace('/[^a-zA-Z0-9\ ]/','',$_REQUEST['yourfield']);
/* Escape your input: use htmlspecialchars to avoid most obvious XSS attacks.
* Note: Your application may still be vulnerable to XSS if you use $yourfield
* in an attribute without proper quoting.
* For more details, see: https://stackoverflow.com/a/130323
*/
$yourfield=htmlspecialchars($yourfield);
} else {
die('User did not send any data to be saved!');
}
// Define MySQL connection and credentials
$pdo_dsn='mysql:dbname=yourdatabase;host=databasehost.example.com';
$pdo_user='yourdatabaseuser';
$pdo_password='yourdatabaspassword';
try {
// Establish connection to database
$conn = new PDO($pdo_dsn, $pdo_user, $pdo_password);
// Throw exceptions in case of error.
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Use prepared statements to mitigate SQL injection attacks.
// See https://stackoverflow.com/questions/60174/how-can-i-prevent-sql-injection-in-php for more details
$qry=$conn->prepare('INSERT INTO yourtable (yourcolumn) VALUES (:yourvalue)');
// Execute the prepared statement using user supplied data.
$qry->execute(Array(":yourvalue" => $yourfield));
} catch (PDOException $e) {
echo 'Error: ' . $e->getMessage() . " file: " . $e->getFile() . " line: " . $e->getLine();
exit;
}
?>
<form method="post">
<!-- Please note that the quotes around next <?php ... ?> block are important
to avoid XSS issues with poorly escaped user input. For more details:
https://stackoverflow.com/a/2894530
-->
<input type="text" name="yourfield" value="<?php print $yourfield; ?>">
<input type="submit" name="youraction" value="save">
</form>
</body>
</html>
Det viktigaste här är att använda förberedda uttalanden för att undvika attacker med SQL-injektioner .