<?php
class Captcha {
protected $code;
protected $height = 40;
protected $width = 180;
protected $numChar = 6;
protected $background = 'black';
function __construct($width = NULL, $height = NULL, $numChar = 6, $background = 'black') {
if(!extension_loaded('gd')){
throw new \Exception("The captcha function requires GD extension on PHP!");
}
$this->numChar = $numChar;
$this->background = $background;
$pos = 'ABCDEFGHJKLMNOPQRSTUWVXZ0123456789abcdefhijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUWVXZ0123456789';
for($i = 0; $i < $this->numChar; $i++) {
$this->code .= substr($pos, mt_rand(0, strlen($pos)-1), 1);
}
/*if (function_exists('token')) {
$this->code = substr(token(100), rand(0, 94), $this->numChar);
} else {
$this->code = substr(sha1(mt_rand()), 17, $this->numChar);
}*/
$this->width = ($width != NULL) ? $width : $this->width;
$this->height = ($height != NULL) ? $height : $this->height;
}
public function __help() {
$helpTxt =
array(
"version" => "1.0",
"Description" => "Captcha module.",
"Use" => 'Declare new Captcha($width, $height, $numChar, $background) on a variable, use $variable->getCode() to obtain a plain text captcha code (prefer pass thos code to a SESSION) and return $variable->showImage(\'format\').',
"Formats" => "bmp, jpg, png, wbmp and gif."
);
var_dump($helpTxt, true);
}
function getCode(){
return $this->code;
}
function showImage($format = 'png') {
$image = imagecreatetruecolor($this->width, $this->height);
$width = imagesx($image);
$height = imagesy($image);
$black = imagecolorallocate($image, 33, 33, 33);
$white = imagecolorallocate($image, 255, 255, 255);
$red = imagecolorallocatealpha($image, 255, 0, 0, 50);
$green = imagecolorallocatealpha($image, 0, 255, 0, 75);
$blue = imagecolorallocatealpha($image, 0, 0, 255, 50);
$orange = imagecolorallocatealpha($image, 255, 136, 0, 50);
$yellow = imagecolorallocatealpha($image, 255, 255, 0, 50);
$punyWhite = imagecolorallocatealpha($image, 255, 255, 255, 40);
$varYellow = imagecolorallocatealpha($image, 255, 255, 0, rand(30,100));
$varBlue = imagecolorallocatealpha($image, 0, 0, 255, rand(30,100));
$varBlack = imagecolorallocatealpha($image, 33, 33, 33, rand(85,95));
$pureYellow = imagecolorallocate($image, 255, 255, 0);
$pureGreen = imagecolorallocate($image, 0, 255, 0);
$softGreen = imagecolorallocate($image, 153, 241, 197);
$softBlue = imagecolorallocate($image, 180, 225, 245);
$softpink = imagecolorallocate($image, 250, 165, 215);
$pureRed = imagecolorallocate($image, 250, 0, 0);
$strongGreen = imagecolorallocate($image, 95, 115, 75);
$pureBlue = imagecolorallocate($image, 0, 0, 215);
$pureorange = imagecolorallocate($image, 255, 135, 0);
$strangePurple = imagecolorallocate($image, 0, 80, 90);
/*$pureBlue = imagecolorallocate($image, 200, 100, 245);*/
switch($this->background) {
case 'black':
$fontColors = array($white, $pureYellow, $pureGreen, $softBlue, $softGreen, $softpink);
imagefilledrectangle($image, 0, 0, $width, $height, $black);
break;
case 'white':
$fontColors = array($black, $pureRed, $strongGreen, $pureBlue, $pureorange, $strangePurple);
imagefilledrectangle($image, 0, 0, $width, $height, $white);
break;
}
if(rand(0,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $red);
} else {
imagefilledrectangle($image, ceil(rand(5, $this->width)), ceil(rand(5, $this->height)), ceil(rand(5, $this->width)), ceil(rand(5, $this->height)), $red);
}
if(rand(1,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $green);
} else {
imagefilledrectangle($image, ceil(rand(5, 145)), ceil(rand(0, 35)), ceil(rand(5, 175)), ceil(rand(0, 40)), $green);
}
if(rand(1,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $varBlue);
} else {
imagefilledrectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $varBlue);
}
if(rand(1,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $orange);
} else {
imagefilledrectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $orange);
}
if(rand(1,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $yellow);
} else {
imagefilledrectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $yellow);
}
imagefilledrectangle($image, 0, 0, $width, 0, $black);
imagefilledrectangle($image, $width - 1, 0, $width - 1, $height - 1, $black);
imagefilledrectangle($image, 0, 0, 0, $height - 1, $black);
imagefilledrectangle($image, 0, $height - 1, $width, $height - 1, $black);
$qualfonte = __DIR__."/18.gdf";
//Carregar uma nova fonte
$fonteCaptcha = imageloadfont($qualfonte);
//imagestring($image, $fonteCaptcha, intval(($width - (strlen($this->code) * 6)) / 16), intval(($height - 15) / 4), $this->code, $white);
$txt = str_split($this->code);
$space = ($this->width-10) / $this->numChar;
foreach($txt as $key => $character) {
$y = ceil(rand(0, $this->height - ($this->height - ($this->height -30))));
$divisor = 1;
$plus = 10;
$incre = 0;
switch ($key) {
case "0":
$x = ceil(rand(0, $space-$plus));
break;
case "1":
$x = ceil(rand($x+$incre/$divisor+$plus, $space*2));
break;
case "2":
$x = ceil(rand($x+$incre/$divisor+$plus, $space*3));
break;
case "3":
$x = ceil(rand($x+$incre/$divisor+$plus, $space*4));
break;
case "4":
$x = ceil(rand($x+$incre/$divisor+$plus, $space*5));
break;
case "5":
$x = ceil(rand($x+$incre/$divisor+$plus, $space*5+$space/2));
break;
default:
$x = ceil(rand($x+$incre/$divisor+$plus, $space*$key+$space/2));
break;
}
imagechar ( $image , $fonteCaptcha , $x , $y, $character , $fontColors[rand(0,count($fontColors)-1)]);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $red);
} else {
imagerectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $red);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $green);
} else {
imageline($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $green);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $blue);
} else {
imagerectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $blue);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $orange);
} else {
imageline($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $orange);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $varYellow);
} else {
imageline($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $varYellow);
}
if(rand(1,2) == 2) {
imageellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $punyWhite);
} else {
imageline($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $punyWhite);
}
if(rand(1,2) == 2) {
imagefilledellipse($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), 30, 30, $varBlack);
} else {
imagefilledrectangle($image, ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), ceil(rand(5, $this->width)), ceil(rand(0, $this->height)), $varBlack);
}
//imagearc ( $image , ceil(rand(5, $this->width)) , ceil(rand(0, $this->height)) ,ceil(rand(5, $this->width)) , ceil(rand(0, $this->height)), ceil(rand(5, $this->width))/ceil(rand(5, $this->height)) , ceil(rand(5, $this->height))/ceil(rand(0, $this->width)) , $pureYellow );
header('Cache-Control: no-cache');
if($format == 'jpeg' || $format == 'jpg') {
header('Content-type: image/jpeg');
imagejpeg($image);
} elseif ($format == 'png') {
header('Content-type: image/png');
imagepng($image);
} elseif ($format == 'bmp' || $format == 'bitmap') {
header('Content-type: image/bmp');
imagebmp($image);
} elseif ($format == 'gif' || $format == 'giff') {
header('Content-type: image/gif');
imagegif($image);
} elseif ($format == 'wbmp') {
header('Content-type: image/vnd.wap.wbmp');
imagewbmp($image);
}
imagedestroy($image);
}
}
?>
