php图片验证码和水印（php100教程33-34-35）

1.验证码的制作：

che.php

<?php/* *Create on 2013-1-29 *This PHP file is made by ZhengHaibo *blog.csdn.net/nuptboyzhb *///首先要修改php.ini 打开图像处理的库php_gd$image='nupt.jpg';$img=getimagesize($image);switch ($img[2]){case 1:$im=@imagecreatefromgif($image);break;case 2:$im=@imagecreatefromjpeg($image);break;case 3:$im=@imagecreatefrompng($image);break;}$waterimg='csdn.jpg';$img2=getimagesize($image);switch ($img2[2]){case 1:$im2=@imagecreatefromgif($waterimg);break;case 2:$im2=@imagecreatefromjpeg($waterimg);break;case 3:$im2=@imagecreatefrompng($waterimg);break;}$str="http://blog.csdn.net/nuptboyzhb/";$te=imagecolorallocate($im, 255, 255, 255);//把字符串写到图像的左上角imagestring($im,6,rand(3,70),rand(0,16),$str,$te);//把水印图片显示到图像上imagecopy($im, $im2, 0, 30, 0, 0, 40,40);header("Content-type: image/jpeg");imagejpeg($im);?>