Wordpress upload to custom folder and allow different extensions

wordpress-snippet-allow-files-uploaddir.php

//uploads to specific dir
//allow xml and .wer
$allowedExtensions = array('wer' => 'application/wer', 'xml' => 'application/xml');
$pathinsideuploads = '/myfiles';

add_filter('upload_mimes', 'custom_upload_files');
function custom_upload_files($mimes) {
		global $allowedExtensions;
		$mimes = array_merge($mimes, $allowedExtensions);
    return $mimes;
}


//https://codex.wordpress.org/Plugin_API/Filter_Reference/wp_handle_upload_prefilter
add_filter('wp_handle_upload_prefilter', 'my_pre_upload');
function my_pre_upload($file) {
    add_filter('upload_dir', 'my_upload_dir');
    return $file;
}
//https://codex.wordpress.org/Function_Reference/wp_handle_upload
add_filter('wp_handle_upload', 'my_post_upload');
function my_post_upload($fileinfo) {
		remove_filter('upload_dir', 'my_upload_dir');
    return $fileinfo;
}

function my_upload_dir($path){    
		global $pathinsideuploads;
    $extension = substr(strrchr($_POST['name'],'.'),1);
    if(!empty($path['error']) || ( array_key_exists($extension,$allowedExtensions))) { return $path; } //error or other filetype; do nothing. 
    $customdir = $pathinsideuploads;
    $path['path']    = str_replace($path['subdir'], '', $path['path']); //remove default subdir (year/month)
    $path['url']     = str_replace($path['subdir'], '', $path['url']);      
    $path['subdir']  = $customdir;
    $path['path']   .= $customdir; 
    $path['url']    .= $customdir;  
    return $path;
}