<?php  // by MoreWindows $imgWidth = 600;  $imgHeight = 400;  $img = imagecreatetruecolor($imgWidth, $imgHeight);  imagefill($img, 0, 0, imagecolorallocate($img, 240, 240, 240));//设置底色  $snowflake_size = 30;  $font_file = "c:\\WINDOWS\\Fonts\\simhei.ttf";   //生成大雪花 其实就是调用imagettftext()输出*号  for ($i=1; $i<=400; $i++)   {      $font_color = imagecolorallocate($img, mt_rand(100,200), mt_rand(100,200), mt_rand(100,200));      imagettftext($img, $snowflake_size, mt_rand(0, 180), mt_rand(0, $imgWidth),mt_rand(0, $imgHeight), $font_color, $font_file, "□");   }  //水印文字  $black_color = imagecolorallocate($img, 0, 0, 0);  imagettftext($img, 12, 0, $imgWidth - 50 , $imgHeight - 20, $black_color, $font_file, "PHP画图");  imagepng($img);  imagedestroy($img);  ?>