php短址转换实现方法

<?php  
//此文件用于转换url 
//整理url 
function dealurl($url) 
{ 
    if($url[4]!=':')$url='http://'.$url; 
    return $url; 
} 
function ranum() 
{ 
$str="0123456789abcdefghijklmnopqrstuvwxyz"; 
$tmp=$str[mt_rand(0,35)].$str[mt_rand(0,35)].$str[mt_rand(0,35)].$str[mt_rand(0,35)].$str[mt_rand(0,35)]; 
return $tmp; 
} 
//存号 
function zipurl($urls) 
{ 
    //查号去重 
    $handle = fopen("url.tmp","r+"); 
    $array=parse_ini_file("url.tmp",true); 
    if(array_search($urls, $array))return array_search($urls, $array); 
    $num=ranum(); 
    fprintf($handle,"%s=%s\r",$num,$urls); 
    fclose($handle); 
    return $num; 
} 
function main() 
{ 
    if($url=$_GET['url']) 
    { 
        $url=dealurl($url); 
        $url=zipurl($url); 
        echo "http://localhost/?".$url; 
    } 
} 
main(); 
?> 
<meta charset="utf-8"> 
<title>ZIP your URL</title> 
<link rel="stylesheet" href="assets/css/amazeui.min.css"> 
<div class="am-g"> 
  <div class=" col-md-8 col-sm-centered"> 
    <form class="am-form" action="zipurl.php" method="get"> 
      <fieldset class="am-form-set"> 
        <input type="text" id="url" name="url" placeholder="输入你想转换的网址"> 
      </fieldset> 
      <div><button type="submit" class="am-btn am-btn-primary am-btn-block">转换</button></div> 
    </form> 
  </div> 
</div>

<?php 
//查号  
//短址访问部分 
function readfiles($strs) 
{ 
    $array=parse_ini_file("url.tmp",true); 
    var_dump($array); 
    return $array[$strs]; 
} 
function main() 
{ 
    //转到模块 
    if($str=$_SERVER['QUERY_STRING']) 
    echo '<script language="javascript">location.href="'.readfiles($str).'";</script>'; 
} 
main(); 
//统计部分 
?> 
<meta charset="utf-8"> 
<title>ZIP your URL</title> 
<link rel="stylesheet" href="assets/css/amazeui.min.css"> 
<div class="am-g"> 
  <div class=" col-md-8 col-sm-centered"> 
    <form class="am-form" action="zipurl.php" method="get"> 
      <fieldset class="am-form-set"> 
        <input type="text" id="url" name="url" placeholder="输入你想转换的网址"> 
      </fieldset> 
      <button type="submit" class="am-btn am-btn-primary am-btn-block">转换</button> 
    </form> 
  </div> 
</div>