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91 lines
3.2 KiB
PHP
91 lines
3.2 KiB
PHP
<?php
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if (!defined('BASEPATH'))
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exit('No direct script access allowed');
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class Captcha_code
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{
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var $width='60';
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var $num='4';
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var $height='20';
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var $name='randcode';
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public function __construct($conf="")
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{
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if($conf!="")
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{
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foreach($conf as $key=>$value)
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{
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$this->$key=$value;
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}
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}
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}
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function show()
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{
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Header("Content-type: image/gif");
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/*
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* 初始化
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*/
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$border = 0; //是否要边框 1要:0不要
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$how = $this->num; //验证码位数
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$w = $this->width; //图片宽度
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$h = $this->height; //图片高度
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$fontsize = 5; //字体大小
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$alpha = "abcdefghijkmnopqrstuvwxyz"; //验证码内容1:字母
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$number = "023456789"; //验证码内容2:数字
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$randcode = ""; //验证码字符串初始化
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srand((double)microtime()*1000000); //初始化随机数种子
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$im = ImageCreate($w, $h); //创建验证图片
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/*
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* 绘制基本框架
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*/
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$bgcolor = ImageColorAllocate($im, 255, 255, 255); //设置背景颜色
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ImageFill($im, 0, 0, $bgcolor); //填充背景色
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if($border)
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{
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$black = ImageColorAllocate($im, 0, 0, 0); //设置边框颜色
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ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//绘制边框
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}
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/*
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* 逐位产生随机字符
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*/
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for($i=0; $i<$how; $i++)
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{
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$alpha_or_number = mt_rand(0, 1); //字母还是数字
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$str = $alpha_or_number ? $alpha : $number;
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$which = mt_rand(0, strlen($str)-1); //取哪个字符
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$code = substr($str, $which, 1); //取字符
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$j = !$i ? 4 : $j+15; //绘字符位置
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$color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字符随即颜色
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ImageChar($im, $fontsize, $j, 3, $code, $color3); //绘字符
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$randcode .= $code; //逐位加入验证码字符串
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}
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/*
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* 添加干扰
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*/
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for($i=0; $i<5; $i++)//绘背景干扰线
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{
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$color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰线颜色
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ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //干扰线
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}
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for($i=0; $i<$how*15; $i++)//绘背景干扰点
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{
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$color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //干扰点颜色
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ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //干扰点
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}
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//把验证码字符串写入session
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//$this->session->set_userdata(array($this->name=>$randcode));
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session_start();
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$_SESSION[$this->name]=$randcode;
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/*绘图结束*/
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Imagegif($im);
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ImageDestroy($im);
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/*绘图结束*/
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}
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}
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