php标准生成验证码程序 <?php session_start(); $enablegd = 1; //判断图像处理函数是否存在 $funcs = array( 'imagecreatetruecolor' , 'imagecolorallocate' , 'imagefill' , 'imagestring' , 'imageline' , 'imagerotate' , 'imagedestroy' , 'imagecolorallocatealpha' , 'imageellips教程e' , 'imagepng' ); foreach($funcs as $func) { if (!function_exists($func)) { $enablegd = 0; break ; } } ob_clean(); //清理缓冲 if ($enablegd) { //create captcha $consts = 'cdfgkmnpqrstwxyz23456' ; $vowels = 'aek23456789' ; for ($x = 0; $x < 6; $x++) { $ const [$x] = substr($consts, mt_rand(0,strlen($consts)-1),1); //获取$consts中的一个随机数 $vow[$x] = substr($vowels, mt_rand(0,strlen($vowels)-1),1); //获取$vowels中的一个随机数 } $radomstring = $ const [0] . $vow[0] .$ const [2] . $ const [1] . $vow[1] . $ const [3] . $vow[3] . $ const [4]; $_SESSION[ 'checkcode' ] = $string = substr($radomstring,0,4); //显示4个字符 $imageX = strlen($radomstring)*8; //图像的宽 $imageY = 20; //图像的高 $im = imagecreatetruecolor($imageX,$imageY); //新建一个真彩色图像 //creates two variables to store color $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); //背景色 $foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)), imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)), imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(0, 10)), imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(245, 255)) ); $foreground2 = imagecolorallocatealpha($im, rand(20, 100), rand(20, 100), rand(20, 100),80); //分配颜色并说明透明度 $middleground = imagecolorallocate($im, rand(200, 160), rand(200, 160), rand(200, 160)); //中间背景 $middleground2 = imagecolorallocatealpha($im, rand(180, 140), rand(180, 140), rand(180, 140),80); //中间背景2 //与左上角的颜色相同的都会被填充 imagefill($im, 0, 0, imagecolorallocate($im, 250, 253, 254)); //往图像上写入文字 imagettftext($im, 12, rand(30, -30), 5, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf' , $string[0]); imagettftext($im, 12, rand(50, -50), 20, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf' , $string[1]); imagettftext($im, 12, rand(50, -50), 35, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf' , $string[2]); imagettftext($im, 12, rand(30, -30), 50, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf' , $string[3]); //画边框 $border = imagecolorallocate($im, 133, 153, 193); imagerectangle($im, 0, 0, $imageX - 1, $imageY - 1, $border); //画一些随机出现的点 $pointcol = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255)); for ($i=0;$i<80;$i++) { imagesetpixel($im,rand(2,$imageX-2),rand(2,$imageX-2),$pointcol); } //画随机出现的线 for ($x=0; $x<9;$x++) { if (mt_rand(0,$x)%2==0) { imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999)); //画线 imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2); //画椭圆 } else { imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999)); imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground); } } //output to browser header( "content-type:image/pngrn" ); imagepng($im); imagedestroy($im); } else { $files = glob(XINCHENG_ROOT. 'images/checkcode/*.jpg' ); if (!is_array($files)) die( '请检查文件目录完整性:/images/checkcode/' ); $checkcodefile = $files[rand(0, count($files)-1)]; //随机其中一个文件 $_SESSION[ 'checkcode' ] = substr(basename($checkcodefile), 0, 4); //获得文件名 header( "content-type:image/jpegrn" ); include $checkcodefile; } ?>
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