title: Upload Multiple Files In PHP
body: <p>I wonder whether someone may be able to help me please.</p>
  
  <p>Using some excellent online tutorials I've put together the code below which allows a user to upload image files to a server folder and the filename and other details to a mySQL database.</p>
  
  <p><strong>PHP Script</strong></p>
  
  <pre><code>&lt;?php
  //define a maxim size for the uploaded images
  //define ("MAX_SIZE","100"); 
  // define the width and height for the thumbnail
  // note that theese dimmensions are considered the maximum dimmension and are not fixed, 
  // because we have to keep the image ratio intact or it will be deformed
  define ("WIDTH","150"); 
  define ("HEIGHT","100"); 
  
  // this is the function that will create the thumbnail image from the uploaded image
  // the resize will be done considering the width and height defined, but without deforming the image
  function make_thumb($img_name,$filename,$new_w,$new_h)
  {
  //get image extension.
  $ext=getExtension($img_name);
  //creates the new image using the appropriate function from gd library
  if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext))
  $src_img=imagecreatefromjpeg($img_name);
  
  if(!strcmp("png",$ext))
  $src_img=imagecreatefrompng($img_name);
  
  //gets the dimmensions of the image
  $old_x=imageSX($src_img);
  $old_y=imageSY($src_img);
  
  // next we will calculate the new dimmensions for the thumbnail image
  // the next steps will be taken: 
  // 1. calculate the ratio by dividing the old dimmensions with the new ones
  // 2. if the ratio for the width is higher, the width will remain the one define in WIDTH variable
  // and the height will be calculated so the image ratio will not change
  // 3. otherwise we will use the height ratio for the image
  // as a result, only one of the dimmensions will be from the fixed ones
  $ratio1=$old_x/$new_w;
  $ratio2=$old_y/$new_h;
  if($ratio1&gt;$ratio2) {
  $thumb_w=$new_w;
  $thumb_h=$old_y/$ratio1;
  }
  else {
  $thumb_h=$new_h;
  $thumb_w=$old_x/$ratio2;
  }
  
  // we create a new image with the new dimmensions
  $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
  
  // resize the big image to the new created one
  imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
  
  // output the created image to the file. Now we will have the thumbnail into the file named by $filename
  if(!strcmp("png",$ext))
  imagepng($dst_img,$filename); 
  else
  imagejpeg($dst_img,$filename); 
  
  //destroys source and destination images. 
  imagedestroy($dst_img); 
  imagedestroy($src_img); 
  }
  
  // This function reads the extension of the file. 
  // It is used to determine if the file is an image by checking the extension. 
  function getExtension($str) {
  $i = strrpos($str,".");
  if (!$i) { return ""; }
  $l = strlen($str) - $i;
  $ext = substr($str,$i+1,$l);
  return $ext;
  }
  $title = ($_POST['title']); 
  
  if ($title == '') // if title is not set 
  $title = '(No Title Provided)';// use (empty title) string 
  //reads the name of the file the user submitted for uploading
  $image=$_FILES['image']['name'];
  
  if ($image) 
  {
  // get the original name of the file from the clients machine
  $filename = stripslashes($_FILES['image']['name']);
  
  // get the extension of the file in a lower case format
  $extension = getExtension($filename);
  $extension = strtolower($extension);
  // if it is not a known extension, we will suppose it is an error, print an error message 
  //and will not upload the file, otherwise we continue
  if (($extension != "jpg") &amp;&amp; ($extension != "jpeg") &amp;&amp; ($extension != "png")) 
  {
  echo '&lt;b&gt; Error! &lt;/b&gt; - The image that you attempted to upload is not in the correct format. The file format &lt;b&gt; must &lt;/b&gt; be one of the following: &lt;b&gt; "jpg", "jpeg" &lt;/b&gt; or &lt;b&gt; "png" &lt;/b&gt;. Please try again.';
  $errors=1;
  }
  else
  {
  // get the size of the image in bytes
  // $_FILES[\'image\'][\'tmp_name\'] is the temporary filename of the file in which the uploaded file was stored on the server
  $size=getimagesize($_FILES['image']['tmp_name']);
  $sizekb=filesize($_FILES['image']['tmp_name']);
  
  //compare the size with the maxim size we defined and print error if bigger
  if ($sizekb &gt; 1150000)
  {
  echo '&lt;b&gt; Error! &lt;/b&gt; - The file that you are attempting to upload is greater than the prescribed &lt;b&gt; 1MB &lt;/b&gt; limit. Please try again.';
  $errors=1;
  }
  
  //we will give an unique name, for example the time in unix time format
  $image_name=time().'.'.$title.'.'.$extension;
  //the new name will be containing the full path where will be stored (images folder)
  $newname="images/".$image_name;
  $copied = copy($_FILES['image']['tmp_name'], $newname);
  if (!$copied) 
  {
  //echo '&lt;b&gt; Error! &lt;/b&gt; Your file has not been loaded';
  //$errors=1;
  }
  else
  {
  // the new thumbnail image will be placed in images/thumbs/ folder
  $thumb_name='images/thumbs/'.$image_name;
  // call the function that will create the thumbnail. The function will get as parameters 
  //the image name, the thumbnail name and the width and height desired for the thumbnail
  $thumb=make_thumb($newname,$thumb_name,WIDTH,HEIGHT);
  } }}
  
  //If no errors registred, print the success message and show the thumbnail image created
  if(isset($_POST['Submit']) &amp;&amp; !$errors) 
  {
  //echo '&lt;br&gt;&lt;b&gt; Success! &lt;/b&gt; - Your image has been uploaded&lt;/br&gt;';
  //echo '&lt;img src="'.$thumb_name.'"&gt;';
  }
  require("mapmyfindsdbinfo.php");
  // Gets data from form
  $userid = $_POST["userid"];
  $locationid = $_POST["locationid"];
  $findosgb36lat = $_POST["findosgb36lat"];
  $findosgb36lon = $_POST["findosgb36lon"];
  $dateoftrip = $_POST["dateoftrip"];
  $findcategory = $_POST["findcategory"];
  $findname = $_POST["findname"];
  $finddescription = $_POST["finddescription"];
  $detectorid= $_POST["detectorname"];
  $searchheadid = $_POST["searchheadname"];
  if( empty($_POST["detectorsettings"]) ) {     
  $detectorsettings = 'No details provided.'; } else {     
  $detectorsettings = $_POST["detectorsettings"]; } 
  if( empty($_POST["pasref"]) ) {     
  $pasref = 'No PAS Ref. number provided.'; } else {     
  $pasref = $_POST["pasref"]; } 
  if( empty($_POST["additionalcomments"]) ) {     
  $additionalcomments = 'No additional comments made.'; } else {     
  $additionalcomments = $_POST["additionalcomments"]; } 
  $makepublic = $_POST["makepublic"];
  
  // Opens a connection to a MySQL server
  $conn = mysql_connect ("hostname", $username, $password);
  if (!$conn) {
    die('Not connected : ' . mysql_error());
  }
  
  // Set the active MySQL database
  $db_selected = mysql_select_db($database, $conn);
  if (!$db_selected) {
    die ('Can\'t use db : ' . mysql_error());
  }
  
  $sql = "INSERT INTO finds (userid, locationid, findosgb36lat, findosgb36lon, dateoftrip, findcategory, findname, finddescription, detectorid, searchheadid, detectorsettings, pasref, additionalcomments, makepublic) VALUES ('$userid', '$locationid', '$findosgb36lat', '$findosgb36lon', '$dateoftrip', '$findcategory', '$findname', '$finddescription', '$detectorid', '$searchheadid', '$detectorsettings', '$pasref', '$additionalcomments', '$makepublic')";
  $result = mysql_query($sql, $conn);
  
  $findid = mysql_insert_id($conn);
  
  $sql = "INSERT INTO testimages (title, imagename, findid) VALUES ('$title', '$image_name', '$findid')";
  $result = mysql_query($sql, $conn);
  
  if (!$result) {
    die('Invalid query: ' . mysql_error());
  }
  
  ?&gt;
  </code></pre>
  
  <p><strong>HTML Form</strong></p>
  
  <pre><code>&lt;form name="savemyfindstolocation" method="post" enctype="multipart/form-data" action="savemyfindstolocation.php"&gt;
      &lt;p align="left"&gt;Do You Wish To Add Find Images&lt;label&gt;&lt;/label&gt;
          &lt;label&gt;&lt;/label&gt;
      &lt;/p&gt;
      &lt;div align="left"&gt;
          &lt;table id="addfiletable" border="1" style="table-layout:auto"&gt;
              &lt;tr&gt;
                  &lt;td&gt;&amp;nbsp;&lt;/td&gt;
                  &lt;td&gt;&lt;div align="center"&gt;Title&lt;/div&gt;&lt;/td&gt;
                  &lt;td&gt;&lt;div align="center"&gt;File Location &lt;/div&gt;&lt;/td&gt;
              &lt;/tr&gt;
              &lt;tr&gt;
                  &lt;td width="20"&gt;&lt;input name="select" type="radio" id="select" title=""/&gt;&lt;/td&gt;
                  &lt;td width="144"&gt;&lt;input name="title" type="text" id="title"/&gt;&lt;/td&gt;
                  &lt;td width="314"&gt;&lt;input name="image" type="file" id="image" onchange="addRow();" size="40"/&gt;&lt;/td&gt;
              &lt;/tr&gt;
          &lt;/table&gt;
          &lt;div align="justify"&gt;
              &lt;input type="submit" name="deleterow" value="Delete Row" /&gt;
          &lt;/div&gt;
      &lt;/div&gt;
      &lt;input name="submit" type="submit" value="Submit" /&gt;        
  &lt;/form&gt;
  </code></pre>
  
  <p>It all works well, but I'd now like to extend the functionality of allowing a user to upload more than 1 file at a time. I've done a fair bit of research to look at how to upload multiple files, but I'm fairly new to PHP and a little unsure as to which is the best way to progress this.</p>
  
  <p>I just wondered whether someone could perhaps have a look at what I've put together and offer some guidance on how I can change this to upload mutiple files upon the form submit.</p>
  
  <p>Many thanks</p>