PHP源码学习：站内搜索HTML版

<?php  
/****************************************************   
program : Spr2[search_html]   
Author  : uchinaboy    
E-mail  : uchinaboy@163.com   
QQ      : 16863798   
Date    : 2001-8-9  
****************************************************/  
//require("config.inc.php");  

function get_msg($path) {  
global $key, $i;  
$handle = opendir($path);  
while ($filename = readdir($handle)) {  
//echo $path."/".$filename."<br>";  
$newpath = $path."/".$filename;  
$check_type = preg_match("/.html?$/", $filename);  
if (is_file($newpath) && $check_type) {  
$fp = fopen($newpath, "r");  
$msg = fread($fp, filesize($newpath));  
fclose($fp);  
match_show($key, $msg, $newpath, $filename);  
}  
if (is_dir($path."/".$filename) && ($filename != ".") &&  ($filename != "..")) {  
//echo "<BR><BR><BR>".$newpath."<BR><BR><BR>";  
get_msg($path."/".$filename);  
}  
}  
closedir($handle);  
return $i;  
}  

function match_show($key, $msg, $newpath, $filename) {  
global $key, $i;  
$key = chop($key);  
if ($key) {  
$msg = preg_replace("/<style>.+</style>/is", "", $msg);  
$msg = str_replace(" ", "", $msg);  
$msg = preg_replace("/<[^>]+>/", "", $msg);  
$value = preg_match("/.*$key.*/i", $msg, $res);  
if ($value) {  
$res[0] = preg_replace("/$key/i", "<FONT SIZE="2"  COLOR="red">$key</FONT>", $res[0]);  
$i++;  
$link = $newpath;  
print "<a href="$link">$filename</a><BR>";  
print $res[0]."<BR><br>";  
}  
}else {  
echo "请输入关键词";  
exit;  
}    
}  
$i = get_msg(".");  
echo "<BR><BR>".$i."<BR><BR><BR>";  

?>