Multiple File Upload

...
<h2 class='ueberschrift'>Neuer Vorgang</h2><div class="kundenadressblock"><br/><br/>Herr  Walter Muster<br/>Hermann-L&ouml;ns-Stra&szlige 17<br/>48123 München<br/><br/></div><form method="POST" action="vorgangspeichern.php" name="haupt_form" enctype="multipart/form-data">  
      <center><table class="datentabelle" cellspacing="0">  
	<tr><td class='datenzelle2'>Kurzbeschreibung</td>  
	<td class='datenzelle2'><input type='text' name='kurzbeschreibung' size='57' value='' ></td></tr>  
	<tr>
	<td class='datenzelle2'>Datum</td>  
	<td class='datenzelle2'><input type='text' name='datum' size='57' value='17.04.2023 - 16:46' readonly></td>  
	</tr>
	<tr><td class='datenzelle2'>Gesprochen mit</td><td class='datenzelle2'><input type='text' name='gesprochenmit' size='57' value='Walter Muster'></td></tr>  
	  <tr><td class='datenzelle2'>Kontakt </td><td class='datenzelle2'><select name="kontaktart_id"><option value='1'>Telefon</option><option value='2'>E-Mail</option><option value='3'>persönlich</option><option value='4'>ViKo</option><option value='5'>Post</option></select></td></tr>  
      
     <tr><td class="datenzelle2">Beschreibung</td><td class="datenzelle2">  
	<textarea name="beschreibung" cols="10" rows="5"></textarea></td></tr>  
	 <tr><td class="datenzelle2">Medien</td><td class="datenzelle2">  
	 <input type="file" name="unterlagen[]" multiple accept=".jpg,.png,.pdf">  
	 <!-- <input type="file" name="datei" accept="application/pdf"> --> 
  <tr><td >&nbsp;</td><td><input type="hidden" name="id" value="44"><input type="submit" value="OK" name="dokuerstellen"></form>...  

$uploaddir = 'C:\\xampp\\htdocs\\app\\Dokumente\\medien\\';  
 //$files = array_filter($_FILES['upload']['name']); //something like that to be used before processing files. 

// Count # of uploaded files in array
$total = count($_FILES['unterlagen']['name']);  

// Loop through each file
for( $i=0 ; $i < $total ; $i++ ) {

  //Get the temp file path
  $tmpFilePath = $_FILES['unterlagen']['tmp_name'][$i];  

  //Make sure we have a file path
  if ($tmpFilePath != ""){  
    //Setup our new file path
    $newFilePath = "C:\\xampp\\htdocs\\app\\Dokumente\\medien\\" . $_FILES['unterlagen']['name'][$i];  

    //Upload the file into the temp dir
    if(move_uploaded_file($tmpFilePath, $newFilePath)) {

      //Handle other code here

    }
  }
}