Non-vBSEO .htaccess Help Needed

I switched from PhotoPost to vBAdvanced Gallery a long time ago, and I created some PHP files to redirect the old links to the new links, but I would like to replace these with .htaccess entries and do a 301 redirect. Can anyone help?

Here are my redirect scripts:

/photopost/showgallery.php:

Code:

<?
$PATH_INFO = getenv("PATH_INFO");
if ( isset($PATH_INFO) ) {
	$test = explode('/', substr($PATH_INFO,1));
	for($i=0; $i < count($test); $i++){
	    if($i % 2 == 0){ $$test[$i] = $test[$i+1];}
	}
}
if (!isset($photo) ) 
{
	header("Location: /gallery/browseimages.php?c=" . $cat . "&u=" . $ppuser);
} else {
	header("Location: /gallery/showimage.php?i=" . $photo . "&c=" . $cat . "&u=" . $ppuser);
}
?>

/photopost/showmembers.php:

Code:

<?
$PATH_INFO = getenv("PATH_INFO");
if ( isset($PATH_INFO) ) {
	$test = explode('/', substr($PATH_INFO,1));
	for($i=0; $i < count($test); $i++){
	    if($i % 2 == 0){ $$test[$i] = $test[$i+1];}
	}
}
if (!isset($photo) ) 
{
	header("Location: /gallery/browseimages.php?c=" . $cat . "&u=" . $ppuser);
} else {
	header("Location: /gallery/showimage.php?i=" . $photo . "&c=" . $cat . "&u=" . $ppuser);
}
?>

/photopost/showphoto.php:

Code:

<?
$PATH_INFO = getenv("PATH_INFO");
if ( isset($PATH_INFO) ) {
	$test = explode('/', substr($PATH_INFO,1));
	for($i=0; $i < count($test); $i++){
	    if($i % 2 == 0){ $$test[$i] = $test[$i+1];}
	}
}
if (!isset($photo) ) 
{
	header("Location: /gallery/browseimages.php?c=" . $cat . "&u=" . $ppuser);
} else {
	header("Location: /gallery/showimage.php?i=" . $photo . "&c=" . $cat . "&u=" . $ppuser);
}
?>

I'm not absolutely sure which URLs should be redirected here, I guess they're the following:

/photopost/showgallery.php/cat/X/ppuser/X/ => /gallery/browseimages.php?c=X&u=X
/photopost/showgallery.php/cat/X/ppuser/X/photo/X/ => /gallery/browseimages.php?i=X&c=X&u=X

/photopost/showmembers.php/cat/X/ppuser/X/ => /gallery/browseimages.php?c=X&u=X
/photopost/showmembers.php/cat/X/ppuser/X/photo/X/ => /gallery/browseimages.php?i=X&c=X&u=X

/photopost/showphoto.php/cat/X/ppuser/X/ => /gallery/browseimages.php?c=X&u=X
/photopost/showphoto.php/cat/X/ppuser/X/photo/X/ => /gallery/browseimages.php?i=X&c=X&u=X

The rewrite rules are:

RewriteRule photopost/showgallery\.php/cat/([0-9]+)/ppuser/([0-9]+)/ gallery/browseimages.php?c=$1&u=$2 [L,R=301]
RewriteRule photopost/showgallery\.php/cat/([0-9]+)/ppuser/([0-9]+)/photo/([0-9]+)/ gallery/browseimages.php?i=$3&c=$2&u=$1 [L,R=301]

RewriteRule photopost/showmembers\.php/cat/([0-9]+)/ppuser/([0-9]+)/ gallery/browseimages.php?c=$1&u=$2 [L,R=301]
RewriteRule photopost/showmembers\.php/cat/([0-9]+)/ppuser/([0-9]+)/photo/([0-9]+)/ gallery/browseimages.php?i=$3&c=$2&u=$1 [L,R=301]

RewriteRule photopost/showphoto\.php/cat/([0-9]+)/ppuser/([0-9]+)/ gallery/browseimages.php?c=$1&u=$2 [L,R=301]
RewriteRule photopost/showphoto\.php/cat/([0-9]+)/ppuser/([0-9]+)/photo/([0-9]+)/ gallery/browseimages.php?i=$3&c=$2&u=$1 [L,R=301]

Well, close. My old URLs weren't using the /'s. They were using standard dynamic URLs. So I would just make those adjustments in the old URLS in your Rules?

Example:

RewriteRule photopost/showphoto\.php?cat=([0-9]+)&ppuser=([0-9]+)&photo=([0-9]+) gallery/browseimages.php?i=$3&c=$2&u=$1 [L,R=301]

?

Thanks!

Yes, it should work fine as in example you mention