133 lines
3.5 KiB
PHP
133 lines
3.5 KiB
PHP
<?php
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class Vcode
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{
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private $width; //宽
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private $height; //高
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private $num; //数量
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private $code; //验证码
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private $img; //图像的资源
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//构造方法， 三个参数
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function __construct($width = 80, $height = 20, $num = 4)
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{
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$this->width = $width;
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$this->height = $height;
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$this->num = $num;
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$this->code = $this->createcode(); //调用自己的方法
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}
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//获取字符的验证码， 用于保存在服务器中
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function getcode()
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{
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return $this->code;
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}
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//输出图像
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function outimg()
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{
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//创建背景 (颜色， 大小， 边框)
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$this->createback();
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//画字 (大小， 字体颜色)
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$this->outstring();
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//干扰元素(点， 线条)
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$this->setdisturbcolor();
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//输出图像
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$this->printimg();
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}
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//创建背景
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private function createback()
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{
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//创建资源
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$this->img = imagecreatetruecolor($this->width, $this->height);
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//设置随机的背景颜色
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$bgcolor = imagecolorallocate($this->img, rand(225, 255), rand(225, 255), rand(225, 255));
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//设置背景填充
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imagefill($this->img, 0, 0, $bgcolor);
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//画边框
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$bordercolor = imagecolorallocate($this->img, 0, 0, 0);
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imagerectangle($this->img, 0, 0, $this->width - 1, $this->height - 1, $bordercolor);
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}
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//画字
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private function outstring()
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{
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for ($i = 0; $i < $this->num; $i++) {
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$color = imagecolorallocate($this->img, rand(0, 128), rand(0, 128), rand(0, 128));
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$fontsize = rand(3, 5); //字体大小
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$x = 3 + ($this->width / $this->num) * $i; //水平位置
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$y = rand(0, imagefontheight($fontsize) - 3);
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//画出每个字符
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imagechar($this->img, $fontsize, $x, $y, $this->code{$i}, $color);
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}
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}
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//设置干扰元素
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private function setdisturbcolor()
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{
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//加上点数
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for ($i = 0; $i < 1; $i++) {
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$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 255), rand(0, 255));
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imagesetpixel($this->img, rand(1, $this->width - 2), rand(1, $this->height - 2), $color);
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}
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//加线条
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for ($i = 0; $i < 1; $i++) {
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$color = imagecolorallocate($this->img, rand(0, 255), rand(0, 128), rand(0, 255));
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imagearc($this->img, rand(-10, $this->width + 10), rand(-10, $this->height + 10), rand(30, 300), rand(30, 300), 55, 44, $color);
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}
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}
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//输出图像
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private function printimg()
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{
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if (imagetypes() & IMG_GIF) {
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header("Content-type: image/gif");
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imagegif($this->img);
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} elseif (function_exists("imagejpeg")) {
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header("Content-type: image/jpeg");
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imagegif($this->img);
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} elseif (imagetypes() & IMG_PNG) {
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header("Content-type: image/png");
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imagegif($this->img);
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} else {
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die("No image support in this PHP server");
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}
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}
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//生成验证码字符串
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private function createcode()
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{
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$codes = "3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKLMNPQRSTUVWXY";
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$code = "";
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for ($i = 0; $i < $this->num; $i++) {
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$code .= $codes{rand(0, strlen($codes) - 1)};
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}
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return $code;
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}
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//用于自动销毁图像资源
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function __destruct()
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{
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imagedestroy($this->img);
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}
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}
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