php英文驗(yàn)證碼
captcha.class.php

復(fù)制代碼 代碼如下:

class Captcha
{
private $width;
private $height;
private $codeNum;
private $code;
private $im;
function __construct($width=80, $height=20, $codeNum=4)
{
$this->width = $width;
$this->height = $height;
$this->codeNum = $codeNum;
}
function showImg()
{
//創(chuàng)建圖片
$this->createImg();
//設(shè)置干擾元素
$this->setDisturb();
//設(shè)置驗(yàn)證碼
$this->setCaptcha();
//輸出圖片
$this->outputImg();
}
function getCaptcha()
{
return $this->code;
}
private function createImg()
{
$this->im = imagecreatetruecolor($this->width, $this->height);
$bgColor = imagecolorallocate($this->im, 0, 0, 0);
imagefill($this->im, 0, 0, $bgColor);
}
private function setDisturb()
{
$area = ($this->width * $this->height) / 20;
$disturbNum = ($area > 250) ? 250 : $area;
//加入點(diǎn)干擾
for ($i = 0; $i $color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
}
//加入弧線
for ($i = 0; $i $color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
}
}
private function createCode()
{
$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
for ($i = 0; $i codeNum; $i++) {
$this->code .= $str{rand(0, strlen($str) - 1)};
}
}
private function setCaptcha()
{
$this->createCode();
for ($i = 0; $i codeNum; $i++) {
$color = imagecolorallocate($this->im, rand(50, 250), rand(100, 250), rand(128, 250));
$size = rand(floor($this->height / 5), floor($this->height / 3));
$x = floor($this->width / $this->codeNum) * $i + 5;
$y = rand(0, $this->height - 20);
imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
}
}
private function outputImg()
{
if (imagetypes() & IMG_JPG) {
header('Content-type:image/jpeg');
imagejpeg($this->im);
} elseif (imagetypes() & IMG_GIF) {
header('Content-type: image/gif');
imagegif($this->im);
} elseif (imagetype() & IMG_PNG) {
header('Content-type: image/png');
imagepng($this->im);
} else {
die("Don't support image type!");
}
}
}

復(fù)制代碼 代碼如下:

require_once 'captcha.class.php';
$captcha = new Captcha(80,30,4);
$captcha->showImg();

復(fù)制代碼 代碼如下:

/*
轉(zhuǎn)載請注明來源于 ITBBS 。
修改請聯(lián)系作者信箱：Smartly@itbbs.cn
*/
Header("Content-type: image/PNG");
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$imgWidth = 140;
$imgHeight = 40;
$authimg = imagecreate($imgWidth,$imgHeight);
$bgColor = ImageColorAllocate($authimg,255,255,255);
$fontfile = "heiti.ttf";
$white=imagecolorallocate($authimg,234,185,95);
imagearc($authimg, 150, 8, 20, 20, 75, 170, $white);
imagearc($authimg, 180, 7,50, 30, 75, 175, $white);
imageline($authimg,20,20,180,30,$white);
imageline($authimg,20,18,170,50,$white);
imageline($authimg,25,50,80,50,$white);
$noise_num = 800;
$line_num = 20;
imagecolorallocate($authimg,0xff,0xff,0xff);
$rectangle_color=imagecolorallocate($authimg,0xAA,0xAA,0xAA);
$noise_color=imagecolorallocate($authimg,0x00,0x00,0x00);
$font_color=imagecolorallocate($authimg,0x00,0x00,0x00);
$line_color=imagecolorallocate($authimg,0x00,0x00,0x00);
for($i=0;$iimagesetpixel($authimg,mt_rand(0,$imgWidth),mt_rand(0,$imgHeight),$noise_color);
}
for($i=0;$iimageline($authimg,mt_rand(0,$imgWidth),mt_rand(0,$imgHeight),mt_rand(0,$imgWidth),mt_rand(0,$imgHeight),$line_color);
}
$randnum=rand(0,strlen($str)-4);
if($randnum%2)$randnum+=1;
$str = substr($str,$randnum,8);?
$str = iconv("GB2312","UTF-8",$str);
ImageTTFText($authimg, 20, 0, 16, 30, $font_color, $fontfile, $str);
ImagePNG($authimg);
ImageDestroy($authimg);
?>