PHP dosyalarının içinde arama yapmak nasıl olur ?

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<?
        function dosyadegistir($yol)
                 {
                 $dizinac=opendir($yol);
                 while (gettype ($dosya = readdir($dizinac) ) != boolean) {
                  if (is_file("$yol/$dosya")) {
                         if (substr($dosya,-3)=="php") {
                           $oku=file_get_contents($dosya);
                           $ac=fopen("$dosya.yeni.php","+w");
                           $degistir=str_replace("Please enter your username and password to log in","Lütfen giriş yapmak için kullanıcı adı ve şifre giriniz",$oku);
                           $yaz=fputs($ac, $degistir);
                           fclose($ac);
                         }
                    
                  }
                 }
                 closedir($dizinac);
                 }
?>

<?
dosyadegistir("inc/");
?>

<?
$search_dirs = array("/home/site.com/public_html/klasor" => "http://www.site.com/klasor/");
// End Specify Directories to search.
function Get_Filenames_To_Search($file_dir)
{
  //Put File Directory Into An Array
  $dir = opendir($file_dir);
  while ($file = readdir($dir)) {
    if ($file != "." && $file != "..")
      $retVal[count($retVal)] = $file;
  }
  //Close Directory and Sort Results
  closedir($dir);
  sort($retVal);
  return $retVal;
}
Function Search_Files_For_Keywords($filenames,$keywords)
{
  for($f = 0; $f < count($filenames); $f++) {
    $filename = $filenames[$f];
    $match = 0;
    $fd = fopen($filename, "r");
    $document = fread($fd, filesize ($filename));
    fclose($fd);
    //Remove HTML Tags, Strip Javascript, Strip White Space Tags before searching
    $search = array ("'<script[^>]*?>.*?</script>'si",  // Strip out Javascript
                     "'<[\/\!]*?[^<>]*?>'si",  // Strip out html tags
                     "'([\r\n])[\s]+'",  // Strip out White Space
                     "'&(quot|#34);'i",  // Replace HTML entities
                     "'&(amp|#38);'i",
                     "'&(lt|#60);'i",
                     "'&(gt|#62);'i",
                     "'&(nbsp|#160);'i",
                     "'&(iexcl|#161);'i",
                     "'&(cent|#162);'i",
                     "'&(pound|#163);'i",
                     "'&(copy|#169);'i",
                     "'&#(\d+);'e");  // evaluate as PHP
    $replace = array ("",
                      " ",
                      "\\1",
                      "\"",
                      "&",
                      "<",
                      ">",
                      " ",
                      chr(161),
                      chr(162),
                      chr(163),
                      chr(169),
                      "chr(\\1)");
    $document = preg_replace ($search, $replace, $document);
    $document = preg_replace ("/\W/", " ", $document);
    $document = preg_replace ("/\s+/", " ", $document);
    //Seperate Each Word into an Array Element and Compare to Keywords
    $document = explode(" ", $document);
    $k = 0;
    for($k = 0; $k < count($keywords); $k++) {
      for($d = 0; $d < count($document); $d++) {
        //compare contents with each keyword
        if (!strcasecmp ($document[$d], $keywords[$k])) {
          $match++;
          break;
        }
      }
    }
   if ($match == count($keywords))
    $retVal[count($retVal)] = $filename;
  }
  return $retVal;
}
if ($keyword != "") { // This IF statement checks to see if keyword textbox is blank
  if ( isset($keyword) ) {
    $keywords = explode(" ", $keyword);
    $pages = array();
    while (list ($key, $val) = each ($search_dirs)) {
      $file_dir = $key;
      chdir($file_dir) or die("Directory (<B>$file_dir</B>) Not found");
      $filenames = Get_Filenames_To_Search($file_dir);
      $found = Search_Files_For_Keywords($filenames,$keywords);
      //add any pages with keywords in current directory to array
      for($i = 0;$i < count($found); $i++) {
        $add = "$val$found[$i]";
        $pages[count($pages)] = $add;
      }
    }
  }
}
?>
<table border='0' cellspacing='0' cellpadding='0' width='600' bgcolor='#ffffff'>
<td width='500' valign='center' align='left'>
<font size='2' color='#000000'>
<h4><font color='#0000ff'>Site Search</font></h4>
<!-- Place Code Here -->
<form>
<b>Enter Search Keywords:</b><br>
<input type=text name=keyword value='Search Keywords' size='30' maxlength='20'><br><br>
<input type=Submit value='Search Site'>
<input type=Reset value='Reset'>
<?PHP
if ( isset($keyword) )
{
  $numberfound = count($pages);
  echo "<br><hr>\n";
  echo "(<b>$numberfound</b>) <font color='#0000ff'>pages were found on your site search for</font> (<b>$keyword</b>).\n";
  echo "<hr><br>\n\n";
  echo "<font color='#0000ff'><b>Search Results</b></font><br>\n\n";
  for ($i = 0; $i < count($pages); $i++)
    echo "<a href='$pages[$i]'>$pages[$i]</a><br>\n";
}
?>
</form>

<!-- End Code -->
</td>
</tr></table>