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Captcha.class.php
<?php /** *================================================================== * captcha.class.php 验证码类,生成验证码 * @author 王超平 * @copyright 传智播客PHP学院 2006-2014 * @version 2.0 * 2014年5月1日 *================================================================= */ class Captcha{ private $charset = ‘abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789‘; //随机因子, private $code; //验证码字符串 private $codelen = 4; //验证码长度 private $width = 150; //宽度 private $height = 40; //高度 private $img; //图形资源句柄 private $font; //指定的字体 private $fontsize = 20; //指定字体大小 private $fontcolor; //指定字体颜色 //构造方法初始化 public function __construct($codelen=4,$width=150,$height=40,$fontsize = 20,$font="elephant.ttf") { $this->codelen = $codelen; $this->width = $width; $this->height = $height; $this->fontsize = $fontsize; $this->font = $font; } //生成随机码 private function createCode() { $_len = strlen($this->charset)-1; for ($i=0;$i<$this->codelen;$i++) { $this->code .= $this->charset[mt_rand(0,$_len)]; } } //生成背景 private function createBg() { $this->img = imagecreatetruecolor($this->width, $this->height); $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255)); imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color); } //生成文字 private function createFont() { $_x = $this->width / $this->codelen; for ($i=0;$i<$this->codelen;$i++) { $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]); } } //生成线条、雪花 private function createLine() { for ($i=0;$i<6;$i++) { $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); } for ($i=0;$i<100;$i++) { $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)); imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),‘*‘,$color); } } //输出 private function outPut() { header(‘Content-type:image/png‘); imagepng($this->img); imagedestroy($this->img); } //对外生成 public function generateCode() { $this->createBg(); $this->createCode(); $this->createLine(); $this->createFont(); $this->outPut(); } //获取验证码 public function getCode() { return strtolower($this->code); } } //调用实例 //$c = new Captcha(); //$c->generateCode(); //$_SESSION[‘captcha‘] = $c->getCode();
Captcha.class.php
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