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90 lines
2.3 KiB
90 lines
2.3 KiB
7 months ago
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<?php
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class Tool_Captcha{
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private $width;
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private $height;
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private $codeNum;
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private $code;
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private $im;
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function __construct($width = 80, $height = 20, $codeNum = 4){
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$this->width = $width;
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$this->height = $height;
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$this->codeNum = $codeNum;
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}
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function showImg(){
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# 创建图片
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$this->createImg();
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# 设置干扰元素
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$this->setDisturb();
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# 设置验证码
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$this->setCaptcha();
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# 输出图片
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$this->outputImg();
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}
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function getCaptcha(){
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return $this->code;
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}
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private function createImg(){
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$this->im = imagecreatetruecolor($this->width, $this->height);
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$bgColor = imagecolorallocate($this->im, 0, 0, 0);
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imagefill($this->im, 0, 0, $bgColor);
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}
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private function setDisturb(){
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$area = ($this->width * $this->height) / 20;
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$disturbNum = ($area > 250)? 250: $area;
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# 加入点干扰
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for($i = 0; $i < $disturbNum; $i++){
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$color = imagecolorallocate($this->im, rand(0, 255), rand(0, 255), rand(0, 255));
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imagesetpixel($this->im, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
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}
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# 加入弧线
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for($i = 0; $i <= 5; $i++){
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$color = imagecolorallocate($this->im, rand(128, 255), rand(125, 255), rand(100, 255));
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imagearc($this->im, rand(0, $this->width), rand(0, $this->height), rand(30, 300), rand(20, 200), 50, 30, $color);
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}
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}
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private function createCode(){
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$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ";
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for($i = 0; $i < $this->codeNum; $i++){
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$this->code .= $str{rand(0, strlen($str) - 1)};
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}
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}
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private function setCaptcha(){
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$this->createCode();
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$tCode = '';
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for($i = 0; $i < $this->codeNum; $i++){
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$color = imagecolorallocate($this->im, rand(200, 250), rand(200, 250), rand(228, 250));
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$size = rand(floor($this->height / 5), floor($this->height / 3));
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$x = floor($this->width / $this->codeNum) * $i + 5;
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$y = rand(0, $this->height - 20);
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imagechar($this->im, $size, $x, $y, $this->code{$i}, $color);
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$tCode .= $this->code{$i};
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}
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$_SESSION['captcha'] = $tCode;
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}
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private function outputImg(){
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if(imagetypes() & IMG_PNG){
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header('Content-type:image/png');
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imagejpeg($this->im);
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}
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elseif(imagetypes() & IMG_GIF){
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header('Content-type: image/gif');
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imagegif($this->im);
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}
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elseif(imagetype() & IMG_JPG){
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header('Content-type: image/jpeg');
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imagepng($this->im);
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}
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else{
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die("Don't support image type!");
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}
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}
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}
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