以下PHP代码无法正常工作;
<div style="text-align:center"><img src="scripts/captcha/index.php?<?php echo session_name()?>=<?php echo session_id()?>" style="vertical-align:middle" /> <input type="text" name="keystring"><br /><span class="fontsm">(word verification)</span></div><br />
进行CAPTCHA验证。它由GoDaddy主持。在旧服务器上，它工作。它已被转移到新服务器，但它无法正常工作。
PHP吐出以下HTML代码;
<img src="scripts/captcha/index.php?PHPSESSID=331f5041b67145685c5401104c602876" style="vertical-align:middle" />
因此，由于某种原因，IMG元素无法加载图像。
当我输入时;
http://c-compiler.com/scripts/captcha/index.php?PHPSESSID=331f5041b67145685c5401104c602876
进入MSIE，它说;
Fatal error: Uncaught Error: Call to undefined function
imagecreatefrompng() in
/home/ccompiler12/public_html/scripts/captcha/kcaptcha.php on line 49
( ! ) Error: Call to undefined function imagecreatefrompng() in
/home/ccompiler12/public_html/scripts/captcha/kcaptcha.php on line 49
Call Stack
# Time Memory Function Location
1 0.0000 354104 {main}( ) .../index.php:0
2 0.0002 355304 KCAPTCHA->KCAPTCHA( ) .../index.php:33
So it's not finding function imagecreatefrompng.
imagecreatefrompng的帮助页面位于;
http://php.net/manual/en/function.imagecreatefrompng.php
如何使此功能正常工作？似乎没有这个 特殊功能是问题。
已安装GD扩展程序。
Is imagecreatefrompng part of GD? If not, which extension are they part of?