本文实例讲述了PHP code 验证码生成类定义和简单使用。分享给大家供大家参考，具体如下：

code.php

<?phpnamespace code;/** * Class Code */class Code{ protected $number;//验证码内字符个数 protected $codeType;//验证码样式 protected $width;//图像宽 protected $height;//图像高 protected $code;//验证码 protected $image;//图像资源 /** * Code constructor. * @param int $number * @param int $codeType * @param int $width * @param int $height */ public function __construct($number=5, $codeType=2, $width=100, $height=40) { $this->number = $number; $this->codeType = $codeType; $this->width = $width; $this->height = $height; $this->code = $this->createCode(); } /** * 销毁资源 */ public function __destruct() { imagedestroy($this->image); } /** * 外部调用code时触发 * @param $name * @return bool */ public function __get($name) { if ('code' == $name) { return $this->$name; } else { return false; } } /** * 生成code */ protected function createCode() { switch ($this->codeType) { case 0: $code = $this->getNum(); break; case 1: $code = $this->getChar(); break; case 2: $code = $this->getNumChar(); break; default: die('样式不对'); } return $code; } /** * 数字验证码 * @return string */ protected function getNum() { $str = join('', range(0,9)); return substr(str_shuffle($str), 0, $this->number); } /** * 字符验证码 * @return string */ protected function getChar() { $str = join('', range('a', 'z')); $str = $str . strtoupper($str); return substr(str_shuffle($str), 0, $this->number); } /** * 字符和数字混合验证码 * @return string */ protected function getNumChar() { $num = join('', range(0, 9)); $str = join('', range('a', 'z')); $str_big = strtoupper($str); $numChar = $num . $str . $str_big; return substr(str_shuffle($numChar), 0, $this->number); } /** * 生成图像 */ protected function createImage() { $this->image = imagecreatetruecolor($this->width, $this->height); } /** * 填充背景色 */ protected function fillColor() { imagefill($this->image, 0, 0, $this->lightColor()); } /** * 浅颜色 * @return int */ protected function lightColor() { return imagecolorallocate($this->image, mt_rand(170, 255), mt_rand(170, 255), mt_rand(170, 255)); } /** * 深颜色 * @return int */ protected function darkColor() { return imagecolorallocate($this->image, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); } /** * 添加验证码字符 */ protected function drawChar() { $width = ceil($this->width/$this->number); for ($i = 0; $i < $this->number; $i++) { $x = mt_rand($i * ($width - 5), ($i + 1) * ($width - 5)); $y = mt_rand(0, $this->height - 15); imagechar($this->image, 5, $x, $y, $this->code[$i], $this->darkColor()); } } /** * 添加干扰点 */ protected function drawDisturb() { for ($i= 0; $i < 100; $i++) { imagesetpixel($this->image, mt_rand(0, $this->width), mt_rand(0, $this->height), $this->darkColor()); } } /** * 添加干扰线 */ protected function drawArc() { for ($i = 0; $i < $this->number - 3; $i++) { imagearc($this->image, mt_rand(5, $this->width), mt_rand(5, $this->height), mt_rand(5, $this->width), mt_rand(5, $this->height),mt_rand(0, 70), mt_rand(300, 360), $this->darkColor()); } } /** * 输出显示 */ protected function show() { header('Content-Type:image/png'); imagepng($this->image); } /** * 外部image */ public function outImage() { $this->createImage();//创建画布 $this->fillColor();//填充背景色 $this->drawChar();//添加验证字符 $this->drawDisturb();//添加干扰点 $this->drawArc();//添加干扰线 $this->show();//输出 }}

展示验证码。。保存验证码和过期时间

<?phpinclude './code/Code.php'; $code = new code\Code();$code->outImage();session_start();$_SESSION['code'] = [ 'code' => $code->code, 'exp_time' => time() + (60 * 60 * 10),];

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希望本文所述对大家PHP程序设计有所帮助。