Discuz!中文验证码呈现繁体文、乱码、口口等不正常现象的解决方案之一
故障描述：在某些Linux的php环境下会出现中文验证码呈现繁体文、乱码、口口等不正常现象适合版本：Discuz!x2 Discuz!x2.5 Discuz!x3 Discuz!x3.1 Discuz!x3.2
解决方法：
1.打开/source/class/class_seccode.php
2.搜索：$this->shadow && imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x + 1, $y + 1, $text_shadowcolor, $font[$i]['font'], $seccode[$i]);
imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x, $y, $text_color, $font[$i]['font'], $seccode[$i]);
替换为：
/* $this->shadow && imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x + 1, $y + 1, $text_shadowcolor, $font[$i]['font'], $seccode[$i]);
imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x, $y, $text_color, $font[$i]['font'], $seccode[$i]);*/
//修复中文验证码
$seccode[$i] = mb_convert_encoding($seccode[$i], "html-entities", "utf-8");
$this->shadow && imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x + 1, $y + 1, $text_shadowcolor, $font[$i]['font'], mb_convert_encoding($seccode[$i], "html-entities", "utf-8"));
imagettftext($this->im, $font[$i]['size'], $font[$i]['angle'], $x, $y, $text_color, $font[$i]['font'], mb_convert_encoding($seccode[$i], "html-entities", "utf-8"));
3.覆盖同名文件，更新缓存，问题解决
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