php图片写入中文乱码的解决办法：首先打开相应的PHP代码文件；然后将mb_convert_encoding("...","UTF-8","GBK");改成“"html-entities","UTF-8"”即可。
本文操作环境：windows7系统、PHP7.1版，DELL G3电脑
具体问题：
在php绘图时，往图片中写入中文是成功的，但是显示出来的中文是一些生僻字。
$im = imagecreatetruecolor(400,40);
$black = imagecolorallocate($im,0,0,0);
$white = imagecolorallocate($im,255,255,255);
$grey = imagecolorallocate($im,128,128,128);
imagefilledrectangle($im,0,0,399,39,$white);
$text = mb_convert_encoding("呵呵呵","UTF-8","GBK");
$font = "simsun.ttc";
imagettftext($im,20,0,12,21,$grey,$font,$text);//输出灰色字符串作为阴影
imagettftext($im,20,0,10,20,$black,$font,$text);//输出黑色字符串作为文本
header("Content-type:image/png");
imagepng($im);
imagedestroy($im);
?>解决办法：
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$text = mb_convert_encoding("呵呵呵","UTF-8","GBK");改成$text = mb_convert_encoding("呵呵呵","html-entities","UTF-8");即可。
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