获取文件扩展名

Posted 2021-02-26

This function works correct with files with no extension.

function getExtension($filename)
{
    return ('.' . ($ext = pathinfo($filename, PATHINFO_EXTENSION)) == $filename) ? null : $ext;
}
 
// Example:
var_dump(getExtension('.htaccess'), getExtension('image.jpg'));
// Result:
// NULL
// string(3) "jpg"