简单实用的PHP验证码类

<?php/** ?* 验证码类 */class Code{ ???// 验证码个数 ???protected $num; ???// 验证码类型（纯数字 纯字母 组合） ???protected $codeType; ???// 验证码宽度 ???protected $width; ???// 验证码高度 ???protected $height; ???// 验证码$code ???protected $code; ???// 图像资源$image ???protected $image; ???// 初始化成员变量，给默认值 ???public function __construct($num = 4, $codeType = 2, $width = 100, $height = 50) ???{ ???????$this->num = $num; ???????$this->codeType = $codeType; ???????$this->width = $width; ???????$this->height = $height; ???????$this->code = $this->createCode(); ???????$this->image = $this->createImage(); ???????// echo $this->code; ???} ???// 创建验证码 ???protected function createCode() ???{ ???????// 根据验证码类型调用不同方法 ???????switch ($this->codeType) { ???????????case 0: ???????????????$code = $this->getNumberCode(); ???????????????break; ???????????case 1: ???????????????$code = $this->getCharCode(); ???????????????break; ???????????case 2: ???????????????$code = $this->getMixCode(); ???????????????break; ???????????default: ???????????????die(‘类型错误‘); ???????} ???????return $code; ???} ???// 纯数字验证码 ???protected function getNumberCode() ???{ ???????// range(0, 9)返回数组 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] ???????// join(‘‘, range(0,9))返回字符串‘0123456789‘ ???????$num = join(‘‘, range(0, 9)); ???????// str_shuffle($num)打乱‘0123456789‘, 再用substr()截取打乱后的前四位字符串 ???????return substr(str_shuffle($num), 0, 4); ???} ???// 纯字母验证码 ???protected function getCharCode() ???{ ???????$char = join(‘‘, range(‘a‘, ‘z‘)); ???????$char = $char . strtoupper($char); ???????return substr(str_shuffle($char), 0, 4); ???} ???// 字母数字组合验证码 ???protected function getMixCode() ???{ ???????$num = join(‘‘, range(0, 9)); ???????$char = join(‘‘, range(‘a‘, ‘z‘)); ???????$mix = $num . $char . strtoupper($char); ???????return substr(str_shuffle($mix), 0, 4); ???} ???// 创建图像 ???protected function createImage() ???{ ???????// 创建画布 ???????$image = imagecreatetruecolor($this->width, $this->height); ???????// 填充颜色 ???????imagefill($image, 0, 0, $this->lightColor($image)); ???????// 画字符 根据传递的字符数量$this->num，这里默认值为4 ???????for ($i = 0; $i < $this->num; $i++) { ???????????// 分别取x坐标（0, 25） （25, 50）（50, 75）（75, 100）, ?+10 和-15 是为了是字符距离左右有点空隙，可以自己微调 ???????????$x = mt_rand(floor($this->width / $this->num) * $i + 10, floor($this->width / $this->num) * ($i + 1) - 15); ???????????$y = mt_rand(10, $this->height - 20); ???????????imagechar($image, 5, $x, $y, $this->code[$i], $this->darkColor($image)); ???????} ???????// 干扰点 150个 ???????for ($i = 0; $i < 150; $i++) { ???????????imagesetpixel($image, mt_rand(0, $this->width), mt_rand(0, $this->height), $this->darkColor($image)); ???????} ???????// 干扰线 5条 ???????for ($i = 0; $i < 5; $i++) { ???????????imageline($image, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $this->darkColor($image)); ???????} ???????// 设置mime ???????header(‘Content-type:image/png‘); ???????// 输出图像 ???????imagepng($image); ???????// 释放资源 ???????imagedestroy($image); ???} ???// 浅色 ???protected function lightColor($image) ???{ ???????// 浅色的rgb值范围大概是130~255之间 ???????return imagecolorallocate($image, mt_rand(130, 255), mt_rand(130, 255), mt_rand(130, 255)); ???} ???// 深色 ???protected function darkColor($image) ???{ ???????// 深色的rgb值范围大概是0~120之间 ???????return imagecolorallocate($image, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); ???}}