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;
}
?>

In your PHP page add something like the following:

$variable = popen("path/to/script.sh", 'r');
while (!feof($variable)) {
echo fgets($variable);
flush();
ob_flush();
}
pclose($variable);

Then in your script you can echo the output like normal — though I recommend modifying it to spit out HTML like so:

while [ 1 ]
do
read CURRENT_ACCOUNT || break
echo "Working with account $CURRENT_ACCOUNT…<br />";
done < list_of_accounts.txt

Then when you run the php page your webpage will be updated each time with the output of your script.sh until it is complete, then it will resume with the rest of your php code.