Help with forcing order of files by name (not using db)

[frdk1]

Title may not explain the problem clearly. I'll try to be clear.

First thing: I'm not very good at this PHP stuff.

The issue at hand: I have a PHP script that finds files (in this case images) within a defined folder and outputs a block with all files listed, and links set on each item. The script works exactly as anticipated on my local server using MAMP with PHP5 – files are listed in filename order (ex: img1, img2, img3) – but on my web server (also using PHP5) they are printed in a completely jumbled (dis)order. Ex: img2, img1, img3. My goal then is to force the order of appearance so that I can feel confident files are always printed in the expected, natural order.

 

This script, which is a standalone affair, does not use any db connection to do its thing. The following code shows the main processing bits. Question is -straightforwardly- how can I force the order? I've been looking at "order by ..." but being the PHP dunce I am, the answer eludes me.

Any help is much appreciated. Thanks.

 

<?php 
// Set to the directory that contains galleries
$dirPath = '' . (($galleryDir !== '') ? ($galleryDir . '/') : '') ;

if ($useTitle && ($galleryTitle !== '')) {
echo "<h3>$galleryTitle</h3>";
}

// Process main
if ($useThumbsDir) {
$dirPathThumbs = $dirPath . 'thumbs/';
show_gallery($dirPathThumbs, $thumbImgClass);
}
else {
show_gallery( $dirPath, $mainImgClass );
}

function get_gallery($dirPath, $imgClass = '') {
$dirObj = dir( $dirPath );
$i = 0;
$strOutput = "";
while (false !== ($entryName = $dirObj->read())) {
	if (is_file( $dirPath . $entryName )) {
		$fileInfo = pathinfo( $dirPath . $entryName );
		$fileExtension = $fileInfo['extension'];
		$extLength = strlen($fileExtension);
		$entry = substr($entryName, 0, -$extLength-1);
		$viewLink = '<a href="path-to-folder/'.$entryName.'" title="'.$entry.'">';

		if ( is_image_extension( $fileInfo["extension"] ) ) {
		++$i;
		$strOutput .= '
		<div class="thumb left">'.$viewLink.'<img class="'.$imgClass.'" src="'.$dirPath.$entryName.'" alt="'.$entry.'" /></a></div>';
		}
	}
} // End while
if ( $i > 0 ) {
	$strOutput = $strOutput.'<div class="clearer"></div>';
}
$dirObj->close();
return $strOutput;
}

function show_gallery( $dirPath, $imgClass = '') {
   if ( $strGallery = get_gallery($dirPath, $imgClass) )
      echo $strGallery;
}

function is_image_extension( $strExtension = '') {
   if ( ($strExtension > '') && in_array( $strExtension, array( 'gif', 'png', 'jpg', 'jpe', 'jpeg' ) ))
      return true;
   return false;
}
?>

 

I should perhaps mention that the script is included within a sNews environment (sNews is PHP/MySQL based) but it works independently so unless I'm missing something that shouldn't really affect things.