<?php// ------------------------------------------------------------------------/** * CodeIgniter Authcode Class * * @package CodeIgniter * @subpackage Libraries * @category Libraries * @author wintion@gmail.com * @link https://www.kandejian.com */class Authcode{ public $CI; //字体路径 public $fontPath; public $image; //生成几位验证码 public $charLen = 4; //验证码字符 public $arrChr = array(); //图片宽 public $width = 100; //图片高 public $height = 30; //字体大小 public $fontSize = 20; //背景色 public $bgcolor = "#ffffff"; //生成杂点 public $showNoisePix = true; //生成杂点数量 public $noiseNumPix = 800; //生成杂线 public $showNoiseLine = true; //生成杂线数量 public $noiseNumLine = 3; //边框,当杂点、线一起作用的时候,边框容易受干扰 public $showBorder = true; public $borderColor = "#000000"; public $session_fix = null; public function __construct() { $this->CI = & get_instance(); //字体文件 $this->fontPath = realpath(dirname(__FILE__) . '/fonts/'); //数字字母验证码 //$this->arrChr = array_merge(range(1, 9) , range('A', 'Z')); ////纯字母验证码 //$this->arrChr = range('A', 'Z'); //纯数字验证码 $this->arrChr = range(0, 9); } /** * 显示验证码 * */ public function show() { $this->image = imageCreate($this->width, $this->height); $this->back = $this->getColor($this->bgcolor); imageFilledRectangle($this->image, 0, 0, $this->width, $this->height, $this->back); $size = $this->width / $this->charLen - 4; if ($size > $this->height) { $size = $this->height; } $left = ($this->width - $this->charLen * ($size + $size / 10)) / $size + 5; $code=''; for($i = 0; $i < $this->charLen; $i ++) { $randKey = rand(0, count($this->arrChr) - 1); $randText = $this->arrChr[$randKey]; $code .= $randText; $textColor = imageColorAllocate($this->image, rand(0, 100), rand(0, 100), rand(0, 100)); $font = $this->fontPath . '/' . rand(1, 5) . ".ttf"; $randsize = rand($size - $size / 10, $size + $size / 10); $location = $left + ($i * $size + $size / 10); @imagettftext($this->image, $this->fontSize, rand(- 18, 18), $location, 25, $textColor, $font, $randText); } if ($this->showNoisePix == true) { $this->setNoisePix(); } if ($this->showNoiseLine == true) { $this->setNoiseLine(); } if ($this->showBorder == true) { $this->borderColor = $this->getColor($this->borderColor); imageRectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $this->borderColor); } $this->CI->session->set_userdata($this->session_fix . "auth_code", $code); header("Content-type: image/jpeg"); imagejpeg($this->image); imagedestroy($this->image); } /** * 显示验证码的JS调用 * */ public function showScript() { //显示验证码 echo "var img_src = '/login/show/?';\n"; echo "document.writeln('<img id=\"authcode\" src=\"' + img_src + Math.random() + '\" style=\"cursor:hand;\" onclick=\"this.src=img_src + Math.random();\" alt=\"点击更换图片\">');"; } /** * 检查验证码是否正确 * * @param string $auth_code * @return bool */ public function check($auth_code = null) { //echo '用户写的:'.$auth_code.'</br>'; //echo 'session的:'.$this->CI->session->userdata('auth_code').'</br>'; if(empty($auth_code)) return false; return ($this->CI->session->userdata($this->session_fix . "auth_code") && $auth_code) ? ($this->CI->session->userdata($this->session_fix . "auth_code") === $auth_code) : false; } public function getColor($color) { $color = preg_replace("/^#/", "", $color); $r = $color[0] . $color[1]; $r = hexdec($r); $b = $color[2] . $color[3]; $b = hexdec($b); $g = $color[4] . $color[5]; $g = hexdec($g); $color = imagecolorallocate($this->image, $r, $b, $g); return $color; } public function setNoisePix() { for($i = 0; $i < $this->noiseNumPix; $i ++) { $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)); imageSetPixel($this->image, rand(0, $this->width), rand(0, $this->height), $randColor); } } public function setNoiseLine() { for($i = 0; $i < $this->noiseNumLine; $i ++) { $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)); imageline($this->image, rand(1, $this->width), rand(1, $this->height), rand(1, $this->width), rand(1, $this->height), $randColor); } } }