PHP 函数集合

<?php
/**********************************************************************
Author:Mr.Chen
QQ number:505185182
mail:[e-mail]

Please keep this head,thank you
*********************************************************************/
function get_file($host,$path="/"){
 $fp=fsockopen($host,80,$errno,$errstr,30);
 $header = "GET ".$path." HTTP/1.1/r/n";
 $header.= "Host : ".$host." /r/n";
 $header.= "Connection: Keep-Alive/r/n/r/n"; 
 fwrite($fp,$header);
 $str="";
 while(!feof($fp)){
  $str.=fgets($fp,128);
 }
 return $str;
 fclose($fp);
}
function write_log($str){
 if(!is_dir("log")){
  $writeable=mkdir("log",0777);
  if(!$writeable){
   exit("sorry! you dir is unwriteable!");
  }
 }
 $fp=fopen("log/log.txt","a+");
 fwrite($fp,$str,strlen($str));
 fwrite($fp,"/r/n");
 fclose($fp);
}
function analysis($str,$host="localhost"){
 $html=array();
 $pattern="/(href=)[/'|/"]([^/'/"]+)[/'|/"]/i";
 preg_match_all($pattern,$str,$match);
 if(is_array($match[2])){
  foreach($match[2] as $key=>$value){
   if(preg_match("/http://///",$value)){
    $html[]=$value;
   }else{
    if(!preg_match("/^(//)*/",$value)){
     $value="/".$value;
    }
    $html[]="http://".$host.$value;
   }
  }
 }else{
  if(preg_match("/http://///",$match[2])){
    $html[]=$match[2];
   }else{
    if(!preg_match("/^(//)*/",$match[2])){
     $value="/".$match[2];
    }else{
     $value=$match[2];
    }
    $html[]="http://".$host.$value;
   }
 }
 return array_unique($html);
}
function get_host($str){
 $host=array();
 $pattern="/^(http:////)?([^//]+)(.*)/";
 if(preg_match($pattern,$str,$match)){
  $host["host"]=$match[2];
  $host["path"]=$match[3];
 }else{
  $host["host"]="";
  $host["path"]="";
 }
 return $host;
}
?>