_w = $width;
$this->_h = $height;
$this->ttf_font = $font;
$this->image = imagecreate($this->_w, $this->_h);
if($_SESSION['verification_key']) $this->char_count = strlen($_SESSION['verification_key']);
}
// sets the bgcolor
function set_bgcolor($r,$g,$b) {
$this->bg_color = imagecolorallocate($this->image, $r, $g, $b);
}
// sets the textcolor
function set_textcolor($r,$g,$b) {
$this->text_color = imagecolorallocate($this->image, $r, $g, $b);
}
// sets the fontsize
function set_fontsize($s) {
$this->font_size = $s;
}
// sets the number of chars
function set_charcount($c) {
$this->char_count = $c;
}
// draws the string
function draw() {
$code = $this->generate_code();
// register the code in the session
$this->register_code($code);
// offsets for x and y in the image
$x = 1;
$y = $this->font_size;
// walk through each character in the
// code, to print it
for($i = 0; $i < strlen($code); $i++) {
$calc_y = rand(10*$y,250) / 10;
//imagestring( $this->image, 3, $x, $calc_y, $code{$i}, $this->text_color);
$angle = rand(-20,20);
$this->write_string($x, $calc_y, $angle, $code{$i});
$x += rand(17,19) ;
}
}
function write_string($x_offset, $y_offset, $angle, $string) {
// check if a font is set
if($this->ttf_font != "") {
// does the file font exist on the server
if(file_exists($this->ttf_font)) {
putenv('GDFONTPATH=' . realpath('.'));
$grey = imagecolorallocate($this->image, 128, 128, 128);
// draw a shadow
imagettftext($this->image, $this->font_size, $angle, $x_offset + 1, $y_offset + 1, $grey, $this->ttf_font, $string);
// draw the text
imagettftext($this->image, $this->font_size, $angle, $x_offset, $y_offset, $this->text_color, $this->ttf_font, $string);
} else {
die("Font doesn't exist, or not in same directory as a .ttf");
}
} else {
die("No font set.");
}
}
// generates a time based random code
// offset is the minutes to be added
function generate_code() {
// define the seed out of which characters the seed will be constructed
$string = md5(rand(0,9999).time());
$output = substr($string, rand(0, 32-$this->char_count), $this->char_count);
return $output;
}
// returns the code that is registered
// in the session
function get_registered_code() {
return $_SESSION['verification_key'];
}
// sets the code, this will be registered as
// the code in the session
function register_code($c) {
$_SESSION['verification_key'] = $c;
}
// checks if the code is valid
function validate_code($code) {
return (strlen($code) == $this->char_count && $code == $this->get_registered_code());
}
// output it to screen
function _output() {
if(!$this->bg_color) $this->set_bgcolor(255,255,255);
if(!$this->bg_color) $this->set_bgcolor(255,34,91);
// draw the image
$this->draw();
header("Content-type: image/png");
imagepng($this->image);
// destroy the image to free resources
imagedestroy($this->image);
}
}
?>
Pedromyndir