Code to merge images using php shell command

Copy the code The code is as follows:
#!/usr/local/bin/php -q
author:freemouse
// The following is the description.
print ("This program is used to merge two 640x480 size. n");
print ("Picture and convert it into a 400x300 size picture n");
print ("You need to specify the default directory n to store the pre-synthesised pictures (a.jpg, b.jpg)") ;
print ("The generated image will be saved as c.jpgn");

//Default directory, edit it yourself^_^
$d="/home/freemouse/Desktop";
print ("Current directory is: $dn");

print (" image 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);

// Scale the two images to 640x480 size
exec("Zoom to 640x480 - quality 95 " . $d . "/a.jpg");
exec("scale to 640x480 - quality 95 " . $d . "/b.jpg");

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

// Save the scaled a.jpg as aa.jpg
$yy = $aa . $a . $ab . $ac;
print ("$yyn");
exec($yy);

// Save the scaled b.jpg as bb.jpg
$zz = $aa . $b . $bb . $cc ;
print ("$zzn");
exec($zz);

// Merge the two pictures into c.jpg.
$adjoin = "Synthesis-Quality 80 ";
$adjoin .= $d . " /aa.jpg ";
$adjoin .= $d . "/bb.jpg ";
$adjoin .= $d . "/c.jpg";
print ("$adjoinn");
exec($adjoin ; $edgen");
exec($edge);

?>