<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>images</title> </head> <body> <?php // 执行函数 verify(); // 创建函数 function verify($w = 100,$h = 60,$num = 4,$type = 1){ $img = imagecreate($w,$h); imagecolorallocate($img, mt_rand(180,255),mt_rand(180,255),mt_rand(180,255)); $str = ""; switch($type){ case '1': $str = '0123456789'; $str = str_shuffle($str); $str = substr($str,0,$num); break; case '2': $arr = range('a','z'); shuffle($arr); $arr = array_slice($arr,0,$num); $str = join('',$arr); break; case '3': $str = "0123456789fsjprdahbucwntzeqgklxyiovmZVHTGOQPCFIYWAKLXMEBNRUSJD"; $str = substr(str_shuffle($str),0,$num); break; } // 画数字和线 for($i = 0;$i < $num; $i++){ $x = $w/$num * $i +5; $y = mt_rand(10,$h-20); imagechar($img,5,$x,$y,$str[$i],deepcolor($img)); imagearc($img,mt_rand(10,$w),mt_rand(10,$h),mt_rand(10,$w),mt_rand(10,$h),mt_rand(0,10),mt_rand(10,270),deepcolor($img)); } // 画点 for($i = 0;$i < 20; $i++){ imagesetpixel ( $img ,mt_rand(0,$w) , mt_rand(0,$h) , lightcolor($img) ); } // 清空输出缓冲区 ob_clean(); // 设置输出图片格式 header("Content-type:image/png"); imagepng($img); imagedestroy($img); }; // 深颜色函数 function deepcolor($img){ return imagecolorallocate ($img,mt_rand(0,130),mt_rand(0,130),mt_rand(0,130)); }; // 浅颜色函数 function lightcolor($img){ return imagecolorallocate($img,mt_rand(130,255),mt_rand(130,255),mt_rand(130,255)); }; ?> </body> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta c
阅读背景：
php gd库写一个简单的验证码
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