PHP & pChart 中的“调用未定义的函数 imagecreatetruecolor”错误

"call to undefined function imagecreatetruecolor" error in PHP & pChart

提问by karthik

I am trying to integrate "pChart" with my PHP code. When I am trying to run the samples it gives me an error stating call to undefined function imagecreatetruecolor. The suggestion solution was to load this dll "php_gd2.dll" so I have uncommented extension=php_gd2.dllin php.ini file.

我正在尝试将“pChart”与我的 PHP 代码集成。当我尝试运行示例时，它给了我一个错误，说明call to undefined function imagecreatetruecolor. 建议的解决方案是加载这个 dll“php_gd2.dll”，所以我extension=php_gd2.dll在 php.ini 文件中取消了注释。

Even after that I get the same error. I have tried restarting the server & machine too.

即使在那之后我也得到同样的错误。我也试过重新启动服务器和机器。

回答by St.Woland

Use the following code to test if you have GD extension:

使用以下代码测试您是否有 GD 扩展：

<?php
$testGD = get_extension_funcs("gd"); // Grab function list 
if (!$testGD){ echo "GD not even installed."; exit; }
echo"<pre>".print_r($testGD,true)."</pre>";

If you get the message that it's not installed, then check the following steps:

如果您收到未安装的消息，请检查以下步骤：

1. phpinfo()and look up php.ini path
2. edit php.ini: extension_dir=<path to your extensions>
3. edit php.ini: extension=php_gd2.dll //uncomment or add
4. Restart web server
5. Run the test script again

1. phpinfo()并查找 php.ini 路径
2. 编辑php.ini：extension_dir=<你的扩展的路径>
3. 编辑php.ini：extension=php_gd2.dll //取消注释或添加
4. 重启网络服务器
5. 再次运行测试脚本

回答by Ranito

In Ubuntu/Linux Mint Platform (under root), use the following command:

在 Ubuntu/Linux Mint 平台（在 root 下），使用以下命令：

apt-get update && apt-get -y install php5-gd

回答by user2255176

For PHP 7.2

对于 PHP 7.2

sudo apt-get install php7.2-gd

回答by vaquel

I met this problem just now. You should exec sudo apt install php7.0-gdor vim your php.ini reopen extension=php_gd2.dll

我刚刚遇到了这个问题。你应该 execsudo apt install php7.0-gd或 vim 你的 php.ini 重新打开 extension=php_gd2.dll

回答by Les

This answer is an update 9 years later, but PHP has changed a lot. Please upvote the St. Woland from which this is derived...

这个答案是 9 年后的更新，但是 PHP 已经发生了很大的变化。请upvote St. Woland，这是从中派生出来的......

Use the following code on your web server to test if you have GD extension:

在您的 Web 服务器上使用以下代码来测试您是否有 GD 扩展：

<?php
    $testGD = get_extension_funcs("gd"); // Grab function list 
    if (!$testGD){
        echo "GD not even installed.";
        phpinfo();  // Display the php configuration for the web server
        exit;
    }
    echo"<pre>".print_r($testGD,true)."</pre>";  //display GD function list

If you get the message that it's not installed, then check the following steps:

如果您收到未安装的消息，请检查以下步骤：

1. Look at the output of phpinfo() to identify your php.ini
2. Edit php.iniand enable the GD extension:
   • Newer PHP (7.3, fg):
     • extension=gd2 //uncomment
   • Older PHP (5.x, 7.0, you should upgrade):
     • extension_dir=<path to your extensions> //uncomment or add
     • extension=php_gd2.dll //uncomment or add
3. GD for 7.x may not be installed
   • (for Ubuntu like OS'es) sudo apt install php7.3-gd# replace version to yours
4. Restart web server
5. Run the test script again
6. (Remove test script when all is working, it can be a security hole)

1. 查看 phpinfo() 的输出以识别您的 php.ini
2. 编辑php.ini并启用 GD 扩展：
   • 较新的 PHP（7.3，fg）：
     • extension=gd2 //取消注释
   • 较旧的 PHP（5.x、7.0，您应该升级）：
     • extension_dir=<path to your extensions> //取消注释或添加
     • extension=php_gd2.dll //取消注释或添加
3. GD for 7.x 可能未安装
   • （对于像操作系统这样的 Ubuntu）sudo apt install php7.3-gd# 将版本替换为你的
4. 重启网络服务器
5. 再次运行测试脚本
6. （当一切正常时删除测试脚本，它可能是一个安全漏洞）

As you can see the exact method is very version dependent. I hope this additional information can help others sort out the exact steps they might need.

正如您所看到的，确切的方法非常依赖于版本。我希望这些附加信息可以帮助其他人理清他们可能需要的确切步骤。

回答by RaZieRSarE

I have same error:

我有同样的错误：

PHP Fatal error:  Call to undefined function imagecreatetruecolor() in /var/www/webphp/php/captcha.php on line 251

and my solution was this:

我的解决方案是这样的：

$ locate php.ini
    /etc/php56/php.ini

edit file php.iniand uncomment line content "extension=gd.so", save and try again

编辑文件php.ini并取消注释行内容“ extension=gd.so”，保存并重试