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, $line) or die("Cannot write");
}
fclose($fp);
$r = copy($nfile,$ofile) or die("Unable to copy");
$r = unlink($nfile) or die("Cannot unlink");
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