1.Captcha.php
1 <?php 2 /** 3 * Captcha.php 4 5 * description 验证码类 6 */ 7 8 namespace ImoocLib; 9 10 require_once 'GDBasic.php'; 11 12 class Captcha extends GDBasic 13 { 14 //图像宽度 15 protected $_width = 60; 16 //图像高度 17 protected $_height = 25; 18 19 //随机串 20 protected $_code = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789abcdefghjklmnpqrstuvwxyz'; 21 22 //字体文件 23 protected $_font_file = './font/comicz.ttf'; 24 25 //图像 26 protected $_im; 27 //验证码 28 protected $_captcha; 29 30 public function __construct($width = null, $height = null) 31 { 32 self::check(); 33 $this->create($width, $height); 34 } 35 36 /** 37 * 创建图像 38 * @param $width 39 * @param $height 40 */ 41 public function create($width, $height) 42 { 43 $this->_width = is_numeric($width) ? $width : $this->_width; 44 $this->_height = is_numeric($height) ? $height : $this->_height; 45 //创建图像 46 $im = imagecreatetruecolor($this->_width, $this->_height); 47 $back = imagecolorallocate($im, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255)); 48 //填充底色 49 imagefill($im, 0, 0, $back); 50 $this->_im = $im; 51 } 52 53 /** 54 * 混乱验证码 55 */ 56 public function moll() 57 { 58 $back = imagecolorallocate($this->_im, 0, 0, 0); 59 //在图像中随机生成50个点 60 for($i = 0; $i < 50; $i++) 61 { 62 imagesetpixel($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); 63 } 64 65 imageline($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); 66 67 imageline($this->_im, mt_rand(0, $this->_width), mt_rand(0, $this->_height), mt_rand(0, $this->_width), mt_rand(0, $this->_height), $back); 68 } 69 70 71 /** 72 * 生成验证码随机串 73 * @param int $length 验证码的个数 74 * @param int $fontSize 字符串的字体大小 75 * @return Captcha 76 */ 77 public function string($length = 4, $fontSize = 15) 78 { 79 $this->moll(); 80 $code = $this->_code; 81 $captcha = ''; 82 for($i = 0; $i < $length; $i++) 83 { 84 $string = $code[mt_rand(0, strlen($code) - 1)]; 85 $strColor = imagecolorallocate($this->_im, mt_rand(100, 150), mt_rand(100, 150), mt_rand(100, 150)); 86 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); 87 $captcha .= $string; 88 } 89 90 $this->_captcha = $captcha; 91 return $this; 92 } 93 94 95 /** 96 * 验证码存入session 97 */ 98 public function setSession() 99 { 100 if(!isset($_SESSION)) 101 { 102 session_start(); 103 } 104 $_SESSION['captcha_code'] = $this->_captcha; 105 } 106 107 /** 108 * 逻辑运算符验证码 109 * @param int $fontSize 字体大小 110 * @return $this 111 */ 112 public function logic($fontSize = 12) 113 { 114 $this->moll(); 115 $codeArray = array(1 => 1, 2, 3, 4, 5, 6, 7, 8, 9); 116 $operatorArray = array('+' => '+', '-' => '-', 'x' => '*'); 117 list($first, $second) = array_rand($codeArray, 2); 118 $operator = array_rand($operatorArray); 119 $captcha = 0; 120 $string = ''; 121 switch($operator) 122 { 123 case '+': 124 $captcha = $first + $second; 125 break; 126 case '-': 127 //当第一个数小于第二个数 128 if($first < $second) 129 { 130 list($first, $second) = array($second, $first); 131 } 132 $captcha = $first - $second; 133 break; 134 135 case 'x': 136 $captcha = $first * $second; 137 break; 138 } 139 //设置验证码类变量 140 $this->_captcha = $captcha; 141 //要输出到图像中的字符串 142 $string = sprintf('%s%s%s=?', $first, $operator, $second); 143 144 $strColor = imagecolorallocate($this->_im, mt_rand(100, 150), mt_rand(100, 150), mt_rand(100, 150)); 145 imagettftext($this->_im, $fontSize, 0, 5, ($this->_height / 3) * 2, $strColor, $this->_font_file, $string); 146 147 return $this; 148 } 149 150 151 /** 152 * 输出验证码 153 */ 154 public function show() 155 { 156 //生成session 157 $this->setSession(); 158 header('Content-Type:image/jpeg'); 159 imagejpeg($this->_im); 160 imagedestroy($this->_im); 161 } 162 }
调用
1 require_once './lib/Captcha.php'; 2 3 $captcha = new ImoocLibCaptcha(80,30); 4 5 $captcha->string(ii6,14)->show(); 6 $captcha->logic(12)->show();