本文分享PHP获取文件扩展名的6种方法，下面是PHP代码：

￥filename = 'mypic.gif';

// 1. The explode/end approach
￥ext = end(explode('.', ￥filename));

// 2. The strrchr approach
￥ext = substr(strrchr(￥filename, '.'), 1);

// 3. The strrpos approach
￥ext = substr(￥filename, strrpos(￥filename, '.') + 1);

// 4. The preg_replace approach
￥ext = preg_replace('/^.*\.([^.]+)￥/D', '￥1', ￥filename);

// 5. The never use this approach
// From: http://php.about.com/od/finishedphp1/qt/file_ext_PHP.htm
￥exts = split([/\\.], ￥filename);
￥n = count(￥exts)-1;
￥ext = ￥exts[￥n];

//6. The pathinfo approach
￥ext = pathinfo(￥filename, PATHINFO_EXTENSION);
?>

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