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php 生成gif验证码出错

Jun 08, 2016 pm 05:29 PM
dll gif nbsp php quot

<script>ec(2);</script>

php动态生成gif图像时遇到了一些问题,现已解决,我用的是php4.05(for win32)+apache3.1.2_win32。
    问题一:动态生成gif的程序根本转不起来
    我写了一个关于用php生成gif的例子,运行,发现页面就是刷不出来,就象是死了一样,浏览器也没有任何错误提示。
    解决办法:修改php所在目录下的php.ini
    修改安装php所在路径下的php.ini(注意:一定是php路径下的php.ini)extension_dir = 安装php的路径extensions(比如:c:phpextensions)。
    问题二:php_gd.dll不支持gif
php 生成gif验证码出错

  我在程序的开头加载了php_gd.dll动态连接库:dl("php_gd.dll");但是在运行程

Warning:  ImageGif: No GIF support in this PHP build in d:apachehtdocsgif2.php3 on line 12

    解决办法:使用php4.05
         这时我才发现是书上写的问题php_gd.dll根本不能支持生成gif,经高人指引才知道自己的版本php4.04 for win32缺少php_gd_gif.dll,于是我下载了一份更高版本的php4.05,这里面有支持生成动态gif的php_gd_gif.dll。
    问题三:出现警告:Warning: Function registration failed - duplicate name - imagearc in d:apachehtdocsgif2.php3 on line 3
    程序如下:

dl("php_gd_gif.dll");
header("content-type:image/gif");
$im = imagecreate(400,30);
$black = imagecolorallocate($im,0,0,0);
$white = imagecolorallocate($im,255,255,255);
imageline( $im,200,15,215,15,$white);
imagestring($im, 5, 4, 10, "This is a Gif", $white);
imagegif($im);
imagedestroy($im);
?>

    解决办法:修改程序或者php.ini   
    dl()函数是用来加载dll的,但如果在php.ini文件中将所需要的dll前面的“;”已经去掉的话,那么这时就不要使用这个函数。
    如果ini文件中extension=php_gd_gif.dll前的“;”没有去,那么就要用dl("php_gd_gif.dll");加载,总之:此两者是互异的,不然服务器认为是重复命名。

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