php7

<pre>
<?php
$allowed = [".txt", ".jpg", ".ppt"];
if(sizeof($_FILES)>0 && $_FILES['userfile']['error'] == 0) {
    //work with file
    //name.name.name.ext
    $fname = basename($_FILES['userfile']['name']);
    $pos = strrpos($fname, '.');
    $ext = substr($name,$pos);
    if(in_array($ext,$allowed)) {
        if(is_uploaded_file($_FILES['userfile']['tmp_name'])){
            move_uploaded_file($_FILES['userfile']['tmp_name']),
            "uploads/".$fname;
            echo "";
        }
    }   else {
        echo "not allowed extension:", $ext;
    }
}else{
    echo "no file selected";
}