GD Warning imagettfbbox() Could not find/open font
在运行pChart的example的时候出现了这个问题，字体路径是没问题的，代码应该也无问题。网上找了一下，发现官网有相应的提示：http://php.net/manual/en/function.imagettftext.php。
fontfile
The path to the TrueType font you wish to use.
Depending on which version of the GD library PHP is using, when fontfile does not begin with a leading / then .ttf will be appendedto the filename and the library will attempt to search for that filename along a library-defined font path.
When using versions of the GD library lower than 2.0.18, a space character, rather than a semicolon, was used as the ‘path separator’ for different font files. Unintentional use of this feature will result in the warning message: Warning: Could not find/open font. For these affected versions, the only solution is moving the font to a path which does not contain spaces.
In many cases where a font resides in the same directory as the script using it the following trick will alleviate any include problems.
<?php
// Set the enviroment variable for GD
putenv(‘GDFONTPATH=’ . realpath(‘.’));
// Name the font to be used (note the lack of the .ttf extension)
$font = ‘SomeFont’;
?>
遇到这个问题可能的原因是字体路径中出现了“.”，不巧的是，我的脚本就出现了。
这个问题的解决方案有两个：
第一种：就是按官网所说的，在使用imagettfbbox()函数前设置GDFONTPATH环境变量；
第二种：我发现使用字体的绝对路径，也是能够加载的。
网上有说法是linux不能用相对路径，这是错误的，算是GD2.0.18以下版本的小缺陷吧。
转载自：https://blog.csdn.net/zycamym/article/details/11913407
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