//PHP- first block of code
<?php 

$name= $_FILES['file']['name'];

$size= $_FILES['file']['size'];


$type= $_FILES['file']['type'];


$tmp_name= $_FILES['file']['tmp_name'];

$position= strpos($name, ".");

$fileextension= substr($name, $position + 1);

$fileextension= strtolower($fileextension);


if (isset($name)) {

$path= 'Uploads/Files/';
if (empty($name))
{
echo "Please choose a file";
}
else if (!empty($name)){
if (($fileextension !== "pdf") && ($fileextension !== "doc") && ($fileextension !== "docx"))
{
echo "The file extension must be .pdf, .doc, or .docx in order to be uploaded";
}


else if (($fileextension == "pdf") || ($fileextension == "doc") || ($fileextension == "docx"))
{
if (move_uploaded_file($tmp_name, $path.$name)) {
echo 'Uploaded!';
}
}
}
}
?>


//HTML Code
<form action="#upload" method='post' enctype="multipart/form-data">
<input type="file" name="file"/><br><br>
<input type="submit" value="Upload"/>
</form>




//PHP- second block of code
<?php

if (($fileextension == "pdf") || ($fileextension == "doc") || ($fileextension == "docx")) {
echo "The file you uploaded is shown below<br><br>";
echo "<a href='$path" . "$name'>";
echo "<br><br>";

}

?>