public static function GBVerify($length = 4, $type = 'png', $width = 180, $height = 50, $fontface = 'simhei.ttf', $verifyName = 'verify') { $code = StringTool::rand_string($length, 4); $width = $length * 45 > $width ? $length * 45 : $width; $_SESSION[$verifyName] = md5($code); $im = imagecreatetruecolor($width, $height); $borderColor = imagecolorallocate($im, 100, 100, 100); //边框色 $bkcolor = imagecolorallocate($im, 250, 250, 250); imagefill($im, 0, 0, $bkcolor); @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor); // 干扰 for ($i = 0; $i < 15; $i++) { $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)); imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor); } for ($i = 0; $i < 255; $i++) { $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255)); imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $fontcolor); } if (!is_file($fontface)) { $fontface = dirname(__FILE__) . '/' . $fontface; } for ($i = 0; $i < $length; $i++) { $fontcolor = imagecolorallocate($im, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); //这样保证随机出来的颜色较深。 $codex = StringTool::msubstr($code, $i, 1); imagettftext($im, mt_rand(16, 20), mt_rand(-60, 60), 40 * $i + 20, mt_rand(30, 35), $fontcolor, $fontface, $codex); } Image::output($im, $type); }