]\nWhere in and out file are absolute paths.\n"); exit(2); } $ifid = fopen($infilename, 'r'); if( !$ifid ) { echo("Opening infile: $infilename failed.\n"); exit(1); } $ofid = fopen($outfilename, 'w'); if( !$ofid ) { echo("Opening outfile: $outfilename failed.\n"); exit(2); } $numlinebuf = 100000; // how many lines to read at once? (tune according to PHP's memory constraints) $maxtsnlen = 16; // Max lenth of a given line (ignoring line ending!) $separator = "\r\n"; // Line ending (typically \n or \r\n) $linewidth = $maxtsnlen + sizeof($separator); $buffsize = $linewidth * $numlinebuf; // how much memory to fread/fwrite. while( !feof($ifid) ) { $buffer = strtolower(fread( $ifid, $buffsize )); if( $debug ) { echo("\nBuffer contents:\n-----------------------\n"); print_r( $buffer ); echo("\n-----------------------\n"); } else { fwrite( $ofid, $buffer ); } } fclose($ifid); fclose($ofid); ?>