PHP验证码类 包括图片生成和验证

<?php class SecureCode { private static $instance=null; private $code = ''; private $fontFile; private $validate; private $image; private $specialAdd = 'special string for SecureCode'; private $codeExpire=86400; private $codeCookieName='secure_code'; /** * 构造方法 */ private function SecureCode() { $this->fontFile = dirname( __FILE__ ) . '/arial.ttf'; } private function __construct() { $this->SecureCode(); } public static function getInstance() { if (self::$instance==null) self::$instance=new self(); return self::$instance; } /** * 指定字体文件所在路径，默认为当前文件夹下arial.ttf文件 * @param $fontFile 文件路径 * @return void */ function loadFont($fontFile) { $this->fontFile = $fontFile; } /** * 图片输出方法，在执行本方法前程序不应该有任何形式的输出 * @return void; */ function stroke() { $this->saveCode(); self::sendHeader(); imagegif( $this->validate ); imagedestroy( $this->validate ); imagedestroy( $this->image ); } /** * 图片保存方法 * @param $fileName 保存路径 * @return void */ function save($fileName) { $this->saveCode(); imagegif( $this->validate , $fileName ); imagedestroy( $this->validate ); imagedestroy( $this->image ); } /** * 验证码验证方法 * @param $input 要验证的字符串，即用户的输入内容 * @return boolean 验证结果 */ function verify($input) { $input=strtolower($input); $targetCode=$this->authCode($input); $code=$this->getCookie(); if (empty($code)||$code!=$targetCode) $result= false; else $result=true; $_COOKIE[$this->codeCookieName]=''; setcookie ( $this->codeCookieName, '', - 1 ); return $result; } /** * 图片创建方法 * @return void; */ function createImage() { $this->randCode(); $size = 30; $width = 90; $height = 35; $degrees = array ( rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 ) ); for ($i = 0; $i < 4; ++$i) { if (rand() % 2); else $degrees[$i] = -$degrees[$i]; } $this->image = imagecreatetruecolor( $size , $size ); $this->validate = imagecreatetruecolor( $width , $height ); $back = imagecolorallocate( $this->image , 255 , 255 , 255 ); $border = imagecolorallocate( $this->image , 0 , 0 , 0 ); imagefilledrectangle( $this->validate , 0 , 0 , $width , $height , $back ); for ($i = 0; $i < 4; ++$i) { $temp = self::RgbToHsv( rand( 0 , 250 ) , rand( 0 , 150 ) , rand( 0 , 250 ) ); if ($temp[2] > 60) $temp[2] = 60; $temp = self::HsvToRgb( $temp[0] , $temp[1] , $temp[2] ); $textcolor[$i] = imagecolorallocate( $this->image , $temp[0] , $temp[1] , $temp[2] ); } for ($i = 0; $i < 200; ++$i) { $randpixelcolor = ImageColorallocate( $this->validate , rand( 0 , 255 ) , rand( 0 , 255 ) , rand( 0 , 255 ) ); imagesetpixel( $this->validate , rand( 1 , 87 ) , rand( 1 , 35 ) , $randpixelcolor ); } $temp = self::RgbToHsv( rand( 220 , 255 ) , rand( 220 , 255 ) , rand( 220 , 255 ) ); if ($temp[2] < 200) $temp[2] = 255; $temp = self::HsvToRgb( $temp[0] , $temp[1] , $temp[2] ); $randlinecolor = imagecolorallocate( $this->image , $temp[0] , $temp[1] , $temp[2] ); self::imagelinethick( $this->validate , $textcolor[rand( 0 , 3 )] ); imagefilledrectangle( $this->image , 0 , 0 , $size , $size , $back ); putenv( 'GDFONTPATH=' . realpath( '.' ) ); // Name the font to be used (note the lack of the .ttf extension imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[0] , $this->fontFile , $this->code[0] ); $this->image = imagerotate( $this->image , $degrees[0] , $back ); imagecolortransparent( $this->image , $back ); imagecopymerge( $this->validate , $this->image , 1 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 ); $this->image = imagecreatetruecolor( $size , $size ); imagefilledrectangle( $this->image , 0 , 0 , $size , $size , $back ); imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[1] , $this->fontFile , $this->code[1] ); $this->image = imagerotate( $this->image , $degrees[1] , $back ); imagecolortransparent( $this->image , $back ); imagecopymerge( $this->validate , $this->image , 21 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 ); $this->image = imagecreatetruecolor( $size , $size ); imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back ); imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[2] , $this->fontFile , $this->code[2] ); $this->image = imagerotate( $this->image , $degrees[2] , $back ); imagecolortransparent( $this->image , $back ); imagecopymerge( $this->validate , $this->image , 41 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 ); $this->image = imagecreatetruecolor( $size , $size ); imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back ); imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[3] , $this->fontFile , $this->code[3] ); $this->image = imagerotate( $this->image , $degrees[3] , $back ); imagecolortransparent( $this->image , $back ); imagecopymerge( $this->validate , $this->image , 61 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 ); imagerectangle( $this->validate , 0 , 0 , $width - 1 , $height - 1 , $border ); } /** * 获取随机生成的验证码 * @return string 随机验证码，返回的验证码不进行任何处理 */ function getCode() { return $this->code; } /** * 生成随机码方法 * @return void; */ protected function randCode() { $alphastr = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789'; $randStr = array ( $alphastr{rand( 0 , 33 )}, $alphastr{rand( 0 , 33 )}, $alphastr{rand( 0 , 33 )}, $alphastr{rand( 0 , 33 )} ); $this->code = strtolower( $randStr[0] . $randStr[1] . $randStr[2] . $randStr[3] ); } /** * RGB色到HSV色转变方法 * @param $R * @param $G * @param $B * @return array HSV数组 */ protected static function RgbToHsv($R, $G, $B) { $tmp = min( $R , $G ); $min = min( $tmp , $B ); $tmp = max( $R , $G ); $max = max( $tmp , $B ); $V = $max; $delta = $max - $min; if ($max != 0) $S = $delta / $max; // s else { $S = 0; //$H = UNDEFINEDCOLOR; return; } if ($R == $max) $H = ($G - $B) / $delta; // between yellow & magenta else if ($G == $max) $H = 2 + ($B - $R) / $delta; // between cyan & yellow else $H = 4 + ($R - $G) / $delta; // between magenta & cyan $H *= 60; // degrees if ($H < 0) $H += 360; return array (