时间:2021-07-01 10:21:17 帮助过:28人阅读
设计一个验证码类,在需要的时候可以随时调用
验证码类,保存为ValidateCode.class.php
1 php 2 //验证码类 3 session_start(); 4 class ValidateCode { 5 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//随机因子 6 private $code;//验证码 7 private $codelen = 4;//验证码长度 8 private $width = 130;//宽度 9 private $height = 50;//高度 10 private $img;//图形资源句柄 11 private $font;//指定的字体 12 private $fontsize = 20;//指定字体大小 13 private $fontcolor;//指定字体颜色 14 //构造方法初始化 15 public function __construct() { 16 $this->font = './latha.ttf';//注意字体路径要写对,否则显示不了图片 17 } 18 //生成随机码 19 private function createCode() { 20 $_len = strlen($this->charset)-1; 21 for ($i=0;$i<$this->codelen;$i++) { 22 $this->code .= $this->charset[mt_rand(0,$_len)]; 23 } 24 } 25 //生成背景 26 private function createBg() { 27 $this->img = imagecreatetruecolor($this->width, $this->height); 28 $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255)); 29 imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color); 30 } 31 //生成文字 32 private function createFont() { 33 $_x = $this->width / $this->codelen; 34 for ($i=0;$i<$this->codelen;$i++) { 35 $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); 36 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[$i]); 37 } 38 } 39 //生成线条、雪花 40 private function createLine() { 41 //线条 42 for ($i=0;$i<6;$i++) { 43 $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156)); 44 imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color); 45 } 46 //雪花 47 for ($i=0;$i<100;$i++) { 48 $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255)); 49 imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color); 50 } 51 } 52 //输出 53 private function outPut() { 54 header('Content-type:image/png'); 55 imagepng($this->img); 56 imagedestroy($this->img); 57 } 58 //对外生成 59 public function doimg() { 60 $this->createBg(); 61 $this->createCode(); 62 $this->createLine(); 63 $this->createFont(); 64 $this->outPut(); 65 } 66 //获取验证码 67 public function getCode() { 68 return strtolower($this->code); 69 } 70 }
注意:第16行中,要修改字体的路径,否则字体图片无法显示
实现,保存为captcha.php
1 session_start(); 2 require './ValidateCode.class.php'; //先把类包含进来,实际路径根据实际情况进行修改。 3 $_vc = new ValidateCode(); //实例化一个对象 4 $_vc->doimg(); 5 $_SESSION['authnum_session'] = $_vc->getCode();//验证码保存到SESSION中
页面使用
<img title="点击刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();">img>
转载自:一个漂亮的php验证码类(分享)
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