Web Dev> Allow users to upload multiple files

In this particular example we are allowing users to upload up to 4 image files at a time (we will specify jpeg, jpg, gif, png, and bmp to be allowed). We will also restrict the size to less than 2mb (16777216 bits)

First we need the page containing our form for uploading the files:

file.php

<form enctype="multipart/form-data" action="upload.php" method="post">
Image1: <input name="file[]" type="file" /><br />
Image2: <input name="file[]" type="file" /><br />
Image3: <input name="file[]" type="file" /><br />
Image4: <input name="file[]" type="file" /><br />
<input type="submit" value="Upload" />
</form>

Now we need the file that will actually do all the work:

upload.php

<?php
$success = 0;
$fail = 0;
$uploaddir = 'images/';
for ($i=0;$i<4;$i++)
{
if($_FILES['file']['name'][$i])
{
// Allow only up to 2mb images
if($_FILES['file']['size'][$i] < 16777216){
$uploadfile = $uploaddir . basename($_FILES['file']['name'][$i]);
$ext = strtolower(substr($uploadfile,strlen($uploadfile)-3,3));
if (preg_match("/(jpeg|jpg|gif|png|bmp)/",$ext))
{
if (move_uploaded_file($_FILES['file']['tmp_name'][$i], $uploadfile))
{
echo " http://example.com/" . $uploadfile . "<br>";
$success++;
}
else
{
echo "Error Uploading the file. Retry after sometime.\n";
$fail++;
}
}
else
{
$fail++;
}
}else{echo "Error uploading file, file is too large";
$fail++;}
}
}
if($success > 0){
echo "<br>Number of files successfully uploaded: " . $success;
}else{
echo "<br>Number of files failed: " . $fail;
}
?>