闲者博客 - 扩展名
https://bk1314.com/tag/%E6%89%A9%E5%B1%95%E5%90%8D/
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PHP获取文件扩展名（后缀）
https://bk1314.com/37.html
2022-02-25T18:49:56+08:00
function getExtension($filename){
$myext = substr($filename, strrpos($filename, '.'));
return str_replace('.','',$myext);
}
$filename = '我的文档.doc';
echo getExtension($filename);