验证码通常用于：发送短信、用户登录、用户修改密码的场景。
1.验证码类封装-GD库验证
note：
- php版本匹配：version_compare()
- 检查一个函数是否存在：function_exists()
- 判断一个值是否是数值：is_numeric()
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<?php /** * GDBasic.php * author: F.X * date: 2017 * description GD基础类 */ namespace Imooc\Lib; class GDBasic { protected static $_check =false; //检查服务器环境中gd库 public static function check() { //当静态变量不为false if(static::$_check) { return true; } //检查gd库是否加载 if(!function_exists("gd_info")) { throw new \Exception('GD is not exists'); } //检查gd库版本 $version = ''; $info = gd_info(); if(preg_match("/\\d+\\.\\d+(?:\\.\\d+)?/", $info["GD Version"], $matches)) { $version = $matches[0]; } //当gd库版本小于2.0.1 if(!version_compare($version,'2.0.1','>=')) { throw new \Exception("GD requires GD version '2.0.1' or greater, you have " . $version); } self::$_check = true; return self::$_check; } } |
2.输出验证码
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<?php /** * Captcha.php * author: F.X * date: 2017 * description 验证码类 */ namespace Imooc\Lib; require_once 'GDBasic.php'; class Captcha extends GDBasic { //图像宽度 protected $_width = 60; //图像高度 protected $_height = 25; //随机串 protected $_code = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghjklmnpqrstuvwxyz'; //字体文件 protected $_font_file = './font/comicz.ttf'; //图像 protected $_im; //验证码 protected $_captcha; public function __construct($width = null, $height = null) { self::check(); $this->create($width, $height); } /** * 创建图像 * @param $width * @param $height */ public function create($width, $height) { $this->_width = is_numeric($width) ? $width : $this->_width; $this->_height = is_numeric($height) ? $height : $this->_height; //创建图像 $im = imagecreatetruecolor($this->_width, $this->_height); $back = imagecolorallocate($im, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255)); //填充底色 imagefill($im, 0, 0, $back); $this->_im = $im; } /** * 混乱验证码 */ public function moll() { $back = imagecolorallocate($this->_im, 0, 0, 0); //在图像中随机生成50个点 for($i = 0; $i < 50; $i++) { imagesetpixel($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); } imageline($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); imageline($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); } /** * 生成验证码随机串 * @param int $length 验证码的个数 * @param int $fontSize 字符串的字体大小 * @return Captcha */ public function string($length = 4, $fontSize = 15) { $this->moll(); $code = $this->_code; $captcha = ''; for($i = 0; $i < $length; $i++) { $string = $code[mt_rand(0, strlen($code) - 1)]; $strColor = imagecolorallocate($this->_im, mt_rand(100, 150), mt_rand(100, 150), mt_rand(100, 150)); imagettftext($this->_im, $fontSize, mt_rand(-10, 10), mt_rand(3, 6) + $i * (($this->_width - 10) / $length), ($this->_height / 3) * 2, $strColor, $this->_font_file, $string); $captcha .= $string; } $this->_captcha = $captcha; return $this; } /** * 验证码存入session */ public function setSession() { if(!isset($_SESSION)) { session_start(); } $_SESSION['captcha_code'] = $this->_captcha; } /** * 逻辑运算符验证码 * @param int $fontSize 字体大小 * @return $this */ public function logic($fontSize = 12) { $this->moll(); $codeArray = array(1 => 1, 2, 3, 4, 5, 6, 7, 8, 9); $operatorArray = array('+' => '+', '-' => '-', 'x' => '*'); list($first, $second) = array_rand($codeArray, 2); $operator = array_rand($operatorArray); $captcha = 0; $string = ''; switch($operator) { case '+': $captcha = $first + $second; break; case '-': //当第一个数小于第二个数就交换，防止负数 if($first < $second) { list($first, $second) = array($second, $first); } $captcha = $first - $second; break; case 'x': $captcha = $first * $second; break; } //设置验证码类变量 $this->_captcha = $captcha; //要输出到图像中的字符串 $string = sprintf('%s%s%s=?', $first, $operator, $second); $strColor = imagecolorallocate($this->_im, mt_rand(100, 150), mt_rand(100, 150), mt_rand(100, 150)); imagettftext($this->_im, $fontSize, 0, 5, ($this->_height / 3) * 2, $strColor, $this->_font_file, $string); return $this; } /** * 输出验证码 */ public function show() { //生成session $this->setSession(); header('Content-Type:image/jpeg'); imagejpeg($this->_im); imagedestroy($this->_im); } } |
测试：index.php
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<?php require_once './lib/Captcha.php'; $captcha = new Imooc\Lib\Captcha(80,30); $captcha -> string(6,4)->show(); |
看SESSION:demo.php
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<?php session_start(); var_dump($_SESSION['captcha_code']); |
