my $tempfile = '/some/temp/directory/and/filename.php';
open( FILE, ">$tempfile" );
print FILE $output;
close FILE;
$output = `/usr/local/bin/php $tempfile` || die "Error: $!\n\n$output";

##</code><code>##

<?php
echo file_get_contents( 'http://www.domain.com/cgi-bin/something.cgi?rm=this&value=that' );
?>