Solution to the problem of garbled watermark generated by GD library

The GD library can be used to process image watermarks. In some circumstances, someone may find that the watermark text generated by GD is garbled. This article will share how to solve the problem of garbled watermarks generated by the GD library.

Recently, a project underwent server migration. After deployment, it was discovered that one of the functions of adding watermark text to pictures had garbled characters. It was confirmed that there was no problem with the function code. At the same time, the project codes were all encoded in UTF-8. There is no encoding problem, and the possibility of problems with the font file has also been checked and ruled out. After finally consulting the information, a PHP compilation parameter was locked --enable-gd-jis-conv.

--enable-gd-jis-conv:

If it is enabled when compiling PHP – If the enable-gd-jis-conv option is used, non-ASCII characters (such as Chinese characters, pinyin, Greek and arrows) will be treated as EUC-JP encoding, eventually causing normal Chinese to become garbled

Solution:

1. Remove the --enable-gd-jis-conv option and recompile php

2. Convert characters to html entities

mb_convert_encoding ('测试', 'HTML-ENTITIES', 'UTF-8');

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