File ramdom.php
Codice PHP:
<?php
session_start();
if (empty($_SESSION['rand_code'])) {
$str = "";
$length = 0;
for ($i = 0; $i < 4; $i++) {
// this numbers refer to numbers of the ascii table (small-caps)
$str .= chr(rand(97, 122));
}
$_SESSION['rand_code'] = $str;
}
$imgX = 60;
$imgY = 20;
$image = imagecreatetruecolor(60, 20);
$backgr_col = imagecolorallocate($image, 238,239,239);
$border_col = imagecolorallocate($image, 208,208,208);
$text_col = imagecolorallocate($image, 46,60,31);
imagefilledrectangle($image, 0, 0, 60, 20, $backgr_col);
imagerectangle($image, 0, 0, 59, 19, $border_col);
$font = "C:\WINDOWS\Fonts\ARIAL.TTF"; // it's a Bitstream font check [url]www.gnome.org[/url] for more
$font_size = 10;
$angle = 0;
$box = imagettfbbox($font_size, $angle, $font, $_SESSION['rand_code']);
$x = (int)($imgX - $box[4]) / 2;
$y = (int)($imgY - $box[5]) / 2;
imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $_SESSION['rand_code']);
header("Content-type: image/png");
imagepng($image);
imagedestroy ($image);
?>
Input page:
Codice PHP:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<input type="text" name="validator" id="validator" size="4" />
[img]random.php[/img]
<?php
if (!empty($_POST['validator']) && $_POST['validator'] == $_SESSION['rand_code']) {
unset($_SESSION['rand_code']);
}
?>
</body>
</html>
Questa riga la devi adattare al path del server
$font = "C:WINDOWSFontsARIAL.TTF";