you could also do it this way:

$ofile = "file.txt";            // original file
$nfile = "new.file.txt";        // new file

$string = "original";           // what needs to be replaced
$replace = "replacement";       // what to replace it with
$data = file($ofile);           // original file's data

$fp = fopen($nfile,"w") or die("Cannot open for writing");
while ( list(,$line) = each($data) ) {
        $line = preg_replace("/$string/", $replace, $line);
        fwrite($fp, $line) or die("Cannot write");

$r = copy($nfile,$ofile) or die("Unable to copy");
$r = unlink($nfile) or die("Cannot unlink");

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