PHP search form not working

<?PHP
// Configuration Variables
$my_server = "http://".getenv("SERVER_NAME").":".getenv("SERVER_PORT"); // This identifies the server where the search takes place (The default will usually work in most situations)
$my_root = getenv("DOCUMENT_ROOT"); // Identifies the document root (This default will usually work)
$s_dirs = array("/","/tests/","/docs/") This is the list of directories that will be searched.  It is a comma separated list that is stored in an array.
$s_skip = array("..","."); // This is the list of directories that will be skipped during the search.  It is another comma separated list.  The default values of ".." and "." should always be listed.
$s_files = "html|htm|HTM|HTML"; // The extensions of the files that will be searched.
$min_chars = "3"; // The minimum number of characters that must be entered to perform the search
$max_chars = "50"; // The maximum number of characters that can be submited to perform the search
$default_val = "Enter Text Search Here"; // This is the default text that will appear in the seach box.
$limit_hits = array("5","10","25","50","100"); // How many hits should be displayed, to suppress the select-menu simply use one value in the array --> array("100")

//The following are the messages that will be displayed to the user.
$message_1 = "Invalid Search Term!"; 
$message_2 = "Please enter at least '$min_chars', and at most '$max_chars' characters."; // The seach term was either too long or too short.
$message_3 = "Your Search Result for:"; // Heading
$message_4 = "Sorry, no matches found."; 
$message_5 = "results"; 
$message_6 = "Match case"; 
$no_title = "Untitled Page"; // This will be displayed if no title or empty title is found in file
$limit_extracts_extracts = ""; // How many text excerpts per file do you like to display. Default: "" --> every extract, alternative: 'integer' e.g. "3"
$byte_size = "512000"; // How many bytes per file should be searched? Reduce to increase speed



function search_form($_GET, $limit_hits, $default_val, $message_5, $message_6, $PHP_SELF) {
	@$keyword=$_GET['keyword'];
	@$case=$_GET['case'];
	@$limit=$_GET['limit'];
	echo "<h3>Search Textbook</h3>";
	echo
	"<form action=\"$PHP_SELF\" method=\"GET\">\n",
	"<input type=\"hidden\" value=\"SEARCH\" name=\"action\">\n",
	"<input type=\"text\" name=\"keyword\" class=\"darkbox\" size=\"25\"  maxlength=\"50\" value=\"";
	if(!$keyword)
		echo "$default_val";
	else
		echo str_replace("&amp;","&",htmlentities($keyword));
	echo "\" ";
	echo "onFocus=\" if (value == '";
	if(!$keyword)
		echo "$default_val"; 
	else
		echo str_replace("&amp;","&",htmlentities($keyword));
	echo "') {value=''}\" onBlur=\"if (value == '') {value='";
	if(!$keyword)
		echo "$default_val"; 
	else
		echo str_replace("&amp;","&",htmlentities($keyword));
	echo "'}\"> ";
	$j=count($limit_hits);
	if($j==1)
		echo "<input type=\"hidden\" value=\"".$limit_hits[0]."\" name=\"limit\">";
	elseif($j>1) {
		echo
		"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<select name=\"limit\" class=\"select\">\n";
		for($i=0;$i<$j;$i++) {
			echo "<option value=\"".$limit_hits[$i]."\"";
			if($limit==$limit_hits[$i])
				echo "SELECTED";
			echo ">".$limit_hits[$i]." $message_5</option>\n";
			}
		echo "</select> ";
		}
	echo
	"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type=\"submit\" value=\"Search\" class='darkbox'>\n",
	"<br>\n",
	"<br>\n",
	"<span class=\"darkbox\">$message_6</span>&nbsp;&nbsp; <input type=\"checkbox\" name=\"case\" value=\"true\" class=\"darkbox\"";
	if($case)
		echo " CHECKED";
	}

function search_headline($_GET, $message_3) {
	@$keyword=$_GET['keyword'];
	@$action=$_GET['action'];
	if($action == "SEARCH") 
		echo "<h4 class=\"result\">$message_3 '<i>".htmlentities(stripslashes($keyword))."</i>'</h4>";
	}

function search_error($_GET, $min_chars, $max_chars, $message_1, $message_2, $limit_hits) {
	global $_GET;
	@$keyword=$_GET['keyword'];
	@$action=$_GET['action'];
	@$limit=$_GET['limit'];
	if($action == "SEARCH") { 
		if(strlen($keyword)<$min_chars||strlen($keyword)>$max_chars||!in_array ($limit, $limit_hits)) { 
			echo "<p class=\"result\"><b>$message_1</b><br>$message_2</p>";
			$_GET['action'] = "ERROR";
			}
		}
	}

function search_dir($my_server, $my_root, $s_dirs, $s_files, $s_skip, $message_1, $message_2, $no_title, $limit_extracts, $byte_size, $_GET) {
	global $count_hits;
	@$keyword=$_GET['keyword'];
	@$action=$_GET['action'];
	@$limit=$_GET['limit'];
	@$case=$_GET['case'];
	if($action == "SEARCH") { 
		foreach($s_dirs as $dir) { 
			$handle = @opendir($my_root.$dir);
			while($file = @readdir($handle)) {
				if(in_array($file, $s_skip)) { 
					continue;
					}
				elseif($count_hits>=$limit) {
					break; 
					}
				elseif(is_dir($my_root.$dir."/".$file)) { 
					$s_dirs = array("$dir/$file");
					search_dir($my_server, $my_root, $s_dirs, $s_files, $s_skip, $message_1, $message_2, $no_title, $limit_extracts, $byte_size, $_GET); 
					}
				elseif(preg_match("/($s_files)$/i", $file)) { 
					$fd=fopen($my_root.$dir."/".$file,"r");
					$text=fread($fd, $byte_size); // 500 KB
					$keyword_html = htmlentities($keyword);
					if($case) { 
						$do=strstr($text, $keyword)||strstr($text, $keyword_html);
						}
					else {
						$do=stristr($text, $keyword)||stristr($text, $keyword_html);
						}
					if($do)	{
						$count_hits++; 
						if(preg_match_all("=<title[^>]*>(.*)</title>=siU", $text, $titel)) { 
							if(!$titel[1][0]) 
								$link_title=$no_title; 
							else
								$link_title=$titel[1][0];  
							}
						else {
							$link_title=$no_title; 
							}
						echo "<a href=\"$my_server$dir/$file\" target=\"_self\" class=\"result\">$count_hits.  $link_title</a><br>"; 
						$auszug = strip_tags($text);
						$keyword = preg_quote($keyword); 
						$keyword = str_replace("/","\/","$keyword");
						$keyword_html = preg_quote($keyword_html); 
						$keyword_html = str_replace("/","\/","$keyword_html");
						echo "<span class=\"extract\">";
						if(preg_match_all("/((\s\S*){0,8})($keyword|$keyword_html)((\s?\S*){0,10})/i", $auszug, $match, PREG_SET_ORDER)); {
							if(!$limit_extracts)
								$number=count($match);
							else
								$number=$limit_extracts;
							for ($h=0;$h<$number;$h++) { 
								if (!empty($match[$h][3]))
									printf("<i><b>..</b> %s<b>%s</b>%s <b>..</b></i>", $match[$h][1], $match[$h][3], $match[$h][4]);
								}
							}
						echo "</span><br><br>";
						flush();
						}
					fclose($fd);
					}
				}
	  		@closedir($handle);
			}
		}
	}

function search_no_hits($_GET, $count_hits, $message_4) {
	@$action=$_GET['action'];
	if($action == "SEARCH" && $count_hits<1) 
		echo "<p class=\"result\">$message_4</p>";
	}
?>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
	<title>Search</title>
    <link href="styles/test.css" rel="stylesheet" type="text/css">
</head>
<body>
<table border="0" align="center" cellpadding="1" cellspacing="10" class="box">
  <tr align="left" valign="top">
	<td width="700" class="darkbox"><table width="500" border="0" align="center" cellpadding="10" cellspacing="0">
      <tr align="left" valign="top">
        <td class="darkbox"><br /><?PHP
    search_form($_GET, $limit_hits, $default_val, $message_5, $message_6, $PHP_SELF);
?>   
<br />
<?PHP
   echo "<br /><br /><hr align='center' width='75%' color='#000000' size='2'>";
   search_headline($_GET, $message_3);
   search_error($_GET, $min_chars, $max_chars, $message_1, $message_2, $limit_hits);
   search_dir($my_server, $my_root, $s_dirs, $s_files, $s_skip, $message_1, $message_2, $no_title, $limit_extracts, $byte_size, $_GET);
   search_no_hits($_GET, $count_hits, $message_4);
?>     </td>
      </tr>
    </table></td>
  </tr>
</table>

</body>
</html>

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