Something like this ..
PHP Code:
<?php
$url1 = 'http://domain.com/file1.txt';
$url2 = 'http://doman.com/file2.txt';
$data = '';
$data.= file_get_contents( $url1 );
$data.= file_get_contents( $url2 );
$fp = fopen( 'writable_file', 'w' );
if ( !$fp )
die('Unable to open file for writing');
fwrite( $fp, $data );
fclose( $data);
echo 'Wrote ' . strlen( $data ) . ' bytes to writable_file';
?>
Not tested, wrote it just now .. Might contain some syntax errors
