Command Line Picture Merge

#!/usr/local/bin/php -q
 Written by William L. Berggren
 Public Domain - Free
<?php
// wow you don't even need print statements.
// shaabang line, -q suppresses html headers 
print ("The purpose of this program is to merge 2 640x480.n");
print ("pictures - or similar ratio - into a 400x300 picturen");
print ("This is for ebay. Initally this will only be done byn");
print ("cropping in the x-axis (Left-Right).  You must edit then"); 
print ("default directory.  This will be the path to a.jpg and b.jpgn");
print ("Imagine a scale from 0-100 that starts at 0 on then");
print ("left side of the picture, and 100 in the middle.  Entering 50n");
print ("will crop 25% off the left side and 25% from the right siden");
print ("of the picture. Picture names will always be a.jpg for n");
print ("the left picture, and b.jpg for the right picture.n");
print ("c.jpg will be the combined picture n");
print ("DEPENDICIES, are imagemagick and php standalonen");
print ("this is easy to test enter convert, mogrify, and php n");
print ("at the command line and something should happen. n n");

//default directory, EDIT THE FOLLOWING LINE
$d="/home/bill/Desktop";
print ("The present directory is named: $dn");

print (" Picture a.jpg offset, 0-100: ");
$fp = fopen("php://stdin", "r");
$a = fgets($fp,255);
print (" Picture b.jpg offset, 0-100: ");
$b = fgets($fp,255);
fclose($fp);
$a=$a*3.2;
$a=floor($a);
$b=$b*3.2;
$b=floor($b);

// resizes pictures a,b to 640x480
exec("mogrify -scale 640x480 -quality 95  " . $d . "/a.jpg");
exec("mogrify -scale 640x480 -quality 95  " . $d . "/b.jpg");

$aa = "convert -quality 90 -crop 320x480+";
$ab = " " . $d . "/a.jpg";
$bb = " " . $d . "/b.jpg";
$ac = " " . $d . "/aa.jpg";
$cc = " " . $d . "/bb.jpg";

// crops picture a.jpg and saves it as aa.jpg
$yy = $aa . $a . $ab . $ac;
print ("$yyn");
exec($yy);

// crops picture b.jpg and saves it as bb.jpg
$zz = $aa . $b . $bb . $cc;
print ("$zzn");
exec($zz);

// joins the 2 pictures, as picture c.jpg.
$adjoin = "convert -quality 80 +append ";
$adjoin .= $d . "/aa.jpg ";
$adjoin .= $d . "/bb.jpg ";
$adjoin .= $d . "/c.jpg";
print ("$adjoinn");
exec($adjoin);

// resizes picture c.jpg to 400x300 and adds border.
$edge="mogrify -scale 400x300 -quality 75 -raise 4x4 -sharpen 1x1 " . $d . "/c.jpg"; 
print ("$edgen");
exec($edge);

?>