Print out questions in sequential order in PHP - php

Question

Problem:
I have a zip file that contains 13 xml files. Each file, except for the first one, contain a quiz question and several answers. When I upload the file to the below script it prints out the questions and the answers correctly, but NOT in order. The order of questions randomly shift each time I upload the zip-file.
Question:
Is there a way I can utilize the file names to tell the script to print out the questions in sequential order every time?
Zip-file contain:
imsmanifest.xml
item101008.xml
item101009.xml
item101010.xml
item101011.xml
item101012.xml
item101013.xml
item101014.xml
item101015.xml
item101016.xml
item101017.xml
item101018.xml
item101019.xml
PHP-script (warning, long script):
<?php
//Initialize counter
$i = 0;
//Go through each file
while (($file = readdir($dh)) !== false)
{
//Skipt the first loop
if ($i > 1)
{
//Ignore misc file
if ($file != 'imsmanifest.xml')
{
//Create new DOM document
$dom= new DOMDocument();
//Load XML file
$dom->load('uploads/' . $file);
//Do not preserve white space
$dom->preserveWhiteSpace = false;
//Check if correct answers should be displayed
if (isset($_POST['XMLAnswers']))
{
//Get correct answer
$correct = $dom->getElementsByTagName( "correctResponse" )->item(0)->nodeValue;
//Get question
$questions = $dom->getElementsByTagName('p')->item(0)->nodeValue;
//Print out question
echo '<h4>' . htmlspecialchars($questions) . '</h4>' . "\n";
//Get answers
$domTable = $dom->getElementsByTagName("simpleChoice");
//Loop through each answer
foreach ($domTable as $answers)
{
//Delete potential unnecessary tags
$pattern = array(
'<p xmlns="http://www.imsglobal.org/xsd/imsqti_v2p1">',
'</p>'
);
//Check if answer is correct one
if ($correct == $answers->getAttribute('identifier'))
{
//Print out correct answer
echo '<span style="color:red;">' . utf8_decode(str_replace($pattern, '', innerHTML($answers))) . '</span><br />' . "\n";
}
else
{
//Print out answer
echo utf8_decode(str_replace($pattern, '', innerHTML($answers))) . '<br />' . "\n";
}
}
}
}
}
//Increment counter
$i++;
}
?>

Answer 1

Rather than using opendir/readdir, use scandir. See http://www.php.net/manual/en/function.scandir.php. scandir returns you a sorted array of files in the directory. You should be able to drop this in and have your code work with minimal changes, other than replacing the outer while readdir loop with:
$files = scandir($dir);
foreach ($files as $file) {
//your current code
}