PHP中查找文件的相对路径也许绝对路径的工具

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 * @version $Id:v 1.0 ,2013/10/13 17:29:00
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 * @copyright (c) Copyright;tsingyuan，2013
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 */
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/**
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 * 返回文件的绝对路径
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 *
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 * @param string $filename
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 * @return string
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 */
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function absoluteroute($filename)
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{
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    $split = '/\/|\\\/';
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    $currentdir = preg_split($split, dirname(__FILE__));
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    $dirarr = preg_split($split, $filename);
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    $diracount = count($dirarr);
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    $cda = count($currentdir);
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    if(strpos(PHP_OS, 'WIN') !== false)
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        $reg = '/\w\:/';
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    else
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        $reg = '/\//';
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    if(!preg_match($reg, $dirarr[0]))
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    {
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        foreach($dirarr as $nk=>$name)
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        {
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            if($name == "." || $name == '..')
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            {
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                if($name == '..')
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                    $filenamearr = array_slice($currentdir, 0, -($nk+1));
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                if($name == '.' && $nk == '0')
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                    $filenamearr = array_slice($currentdir, 0);
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            }
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            else
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            {
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                $filenamearr[] = $name;
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            }
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        }
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        $filename = implode('/', $filenamearr);
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    }
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    return $filename;
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}
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/**
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 * 返回两个文件的相对路径 （PS：^_^不错的php学习交流群：276167802，验证：csl，有兴趣的话可以加入进来一起讨论）
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 * （为了保证输入的相对路径参数可用，故此函数依赖absoluteroute）
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 *
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 * @param string $filenamea
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 * @param string $filenameb
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 * @return string
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 */
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function relativeroute($filenamea, $filenameb)
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{
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    $split = '/\/|\\\/';
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    $filenamea = absoluteroute($filenamea);
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    $filenameb = absoluteroute($filenameb);
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    $dira =preg_split($split, $filenamea);
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    $dirb =preg_split($split, $filenameb);
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    $flag = true;
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    if(count($dira) >= count($dirb))
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    {
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        $tmp = array();
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        $tmp = $dira;
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        $dira = $dirb;
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        $dirb = $tmp;
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        $flag = false;
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    }
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    foreach($dira as $k=>$v)
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        if($v != $dirb[$k])break;
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    $dirr = array_slice($dirb, $k);
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    $k == 1 ? $dtag  = '/' :  $dtag  = './';
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    $result = $dtag.implode('/', $dirr);
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    if(!$flag)
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    {
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        if($dira[0] == '')array_shift($dira);
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        foreach($dirr as $kk=>&$v)
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            ($kk+1) != count($dirr)?
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                ($v ?
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                    $v = '..' :
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                    $v = '.'
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                ) :
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                $v = implode('/', array_slice($dira, $k)) ;
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        $result = $dtag.implode('/', $dirr);
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    }
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    return $result;
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}