一个非常好用的验证码工具类

/*** 验证码类*/class Base_Tool_Verify{/*** 生成验证码方法*/public static function createCode(){//生成验证码图片// 全数字$str = "D,B,2,3,4,5,6,7,8,9,A,B,C,D,E,F,G,H,W,J,K,M,M,N,K,P,Q,R,S,T,U,V,W,X,Y,Z"; //要显示的字符，可自己进行增删$list = explode(",", $str);$cmax = count($list) - 1;$verifyCode = '';for ( $i=0; $i $randnum = mt_rand(0, $cmax);$verifyCode .= $list[$randnum]; //取出字符，组合成为我们要的验证码字符}$_SESSION['code'] = $verifyCode; //将字符放入SESSION中$im = imagecreate(80,28); //生成图片$black = imagecolorallocate($im, 0 ,0 ,0); //此条及以下三条为设置的颜色$white = imagecolorallocate($im, 244,249,244);$gray = imagecolorallocate($im, rand(200,255),rand(200,255),rand(200,255));$red = imagecolorallocate($im, rand(200,255), rand(200,255), rand(200,255));$rand_color = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));$rand_color2 = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));imagefill($im,0,0,$white); //给图片填充颜色$pix=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));mt_srand();for($i=0;$i {imagesetpixel($im,mt_rand(0,180),mt_rand(0,35),$pix);}imageline($im, 0,rand(0,28), 80, rand(0,28), $rand_color);imageline($im, 0,rand(0,28), 80, rand(0,28), $rand_color2);//将验证码绘入图片$mycolor = imagecolorallocate($im, 0, 78, 152);$path = API_PATH.DS.'Base'.DS.'Tool';putenv('GDFONTPATH=' . $path);$font = 'simhei.ttf';$arrstr = str_split($verifyCode);imagettftext($im, 20, rand(0,50), 10, rand(20,30), $mycolor, $font, $arrstr[0]);imagettftext($im, 15, rand(0,50), 20, rand(20,30), $mycolor, $font, $arrstr[1]);imagettftext($im, 15, rand(0,50), 30, rand(20,30), $mycolor, $font, $arrstr[2]);imagettftext($im, 15, rand(0,50), 40, rand(20,30), $mycolor, $font, $arrstr[3]);$font2=imagecolorallocate($im,41,163,238);imagerectangle($im,0,0,1,1,$font2);imagepng($im);imagedestroy($im);}}复制代码