全文搜索和替换

exec("/bin/grep -r '$oldWord' $rootpath", $results, $errorCode);　
if ($errorCode){　
if ($errorCode == 1){　
echo "Possibly no files were found with $oldword in them
\n";　
}　
echo "OS Error: $errorCode
\n";　
echo "Check 'man errno' and count down
\n";　
echo "Usually paths/permissions
\n";　
}　
while (list(,$path) = each($results)){　
$parts = explode(':', $path);　
$path = $parts[0];　
$fp = fopen($path, 'r') or PRint("Cannot read $path
\n");　
if ($fp){　
$data = fread($fp, filesize($path));　
fclose($fp);　
$newdata = str_replace($oldword, $newword, $data);　
$fp = fopen($path, 'w') or print("Cannot write $path
\n");　
if ($fp){　
fwrite($fp, $newdata);　
fclose($fp);　
echo $path, "
\n";　
}　
}　
}　
?>　
Example　
http://yourserver.com/globalreplace.php?oldword=test&newword=text&rootpath=/path/to/dir