PHP's GD function imagettftext() should pay attention to the default character encoding
Author：Eve Cole
Update Time：2009-06-07 15:15:31
I am developing a small function these days, which is similar to a personalized forum signature. It automatically generates a picture with text on it based on member information. The stitching of images can be done using functions such as imagecopy() and imagecopyresampled(). However, when it comes to drawing text, I encounter a problem. The text template is saved in a text file. The program first reads the file and replaces the variables in it with data, and then uses the imagettftext() function to draw it on the picture. Unfortunately, the drawn picture is garbled @_@ ...So I searched for related issues on Google and found that most people were saying that the string passed in the imagettftext() function needs to be UTF-8 encoded, and the official PHP manual also clearly states "UTF-8 encoded string." It can be passed directly", but the problem is that the encoding of the template file is originally UTF-8, which is a bit puzzling. In desperation, I used EmEditor to open the original template file, tried converting it to different encodings, and compared it with the garbled code output by GD. It turned out that when I converted to EUC-JP encoding, it actually matched the garbled code output by GD... that is to say , the default encoding of GD on the server here is EUC-JP, and that is a Japanese encoding. I searched the settings of php.ini and found no relevant options, so another question came up. Where is this default encoding set? It was Si Wen's brother Niu who discovered that there was a "--enable-gd-jis-conv" parameter in the PHP compilation parameters that was very suspicious. Google found that many garbled problems were related to this compilation parameter... Official parameter description It is "GD: Enable JIS-mapped Japanese font support.", which means that GD supports Japanese-encoded fonts (damn it, why is there no compilation option to support Chinese-encoded fonts...Does PHP also discriminate against nationality = =b), to put it bluntly, enable it If this option is enabled, GD will map the parts greater than 127 in the TTF font library (that is, the parts that do not belong to the standard Latin font library) according to the order of Japanese JIS, and then it will naturally become garbled when used to map Chinese fonts. Without further ado, remove this option and recompile, and the problem will be solved. After removing this option, the default encoding of imagettftext() becomes UTF-8, and Chinese can be displayed normally~
