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    echo dirname(__FILE__);
    echo "<p>";
    echo dirname(dirname(__FILE__));

<?
$path = "/etc/hostname";
$file = dirname($path);
?>

     function getIp(){

        if (getenv('HTTP_CLIENT_IP'))
        {  
            $ip = getenv('HTTP_CLIENT_IP');
        } elseif (getenv('HTTP_X_FORWARDED_FOR'))
        {  
            list($ip) = explode(',', getenv('HTTP_X_FORWARDED_FOR'));
        } elseif (getenv('REMOTE_ADDR'))
        {  
            $ip = getenv('REMOTE_ADDR');
        }  
        else
        {
            $ip = $_SERVER['REMOTE_ADDR'];
        }
        return $ip;
    }

  static  public function getIp() {
    // Gets the default ip sent by the user
    if (!empty($_SERVER['REMOTE_ADDR'])) {
      $direct_ip = $_SERVER['REMOTE_ADDR'];
    }
    // Gets the proxy ip sent by the user
    $proxy_ip     = '';
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
      $proxy_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else if (!empty($_SERVER['HTTP_X_FORWARDED'])) {
      $proxy_ip = $_SERVER['HTTP_X_FORWARDED'];
    } else if (!empty($_SERVER['HTTP_FORWARDED_FOR'])) {
      $proxy_ip = $_SERVER['HTTP_FORWARDED_FOR'];
    } else if (!empty($_SERVER['HTTP_FORWARDED'])) {
      $proxy_ip = $_SERVER['HTTP_FORWARDED'];
    } else if (!empty($_SERVER['HTTP_VIA'])) {
      $proxy_ip = $_SERVER['HTTP_VIA'];
    } else if (!empty($_SERVER['HTTP_X_COMING_FROM'])) {
      $proxy_ip = $_SERVER['HTTP_X_COMING_FROM'];
    } else if (!empty($_SERVER['HTTP_COMING_FROM'])) {
      $proxy_ip = $_SERVER['HTTP_COMING_FROM'];
    }
    // Returns the true IP if it has been found, else FALSE
    if (empty($proxy_ip)) {
      // True IP without proxy
      return $direct_ip;
    } else {
      $is_ip = preg_match('|^([0-9]{1,3}\.){3,3}[0-9]{1,3}|', $proxy_ip, $regs);
      if ($is_ip && (count($regs) > 0)) {
        // True IP behind a proxy
        return $regs[0];
      } else {
        // Can't define IP: there is a proxy but we don't have
        // information about the true IP
        return $direct_ip;
      }
    }
  }

<?php
$str="hallo world"; //比如这个是元算结果
$code= "print('\n$str\n');";//这个是保存在数据库内的php代码
echo "***";
echo($code);//打印组合后的命令,str字符串被替代了,形成一个完整的php命令,但并是不会执行
echo "###";
eval($code);//执行了这条命令
?>;

  
function cache_write($file, $string, $type = 'array')  
{  
     if(is_array($string))  
     {  
         $type = strtolower($type);  
         if($type == 'array')  
         {  
             $string = "<?php\n return ".var_export($string,TRUE).";\n?>";  
         }  
         elseif($type == 'constant')  
         {  
             $data='';  
             foreach($string as $key => $value) $data .= "define('".strtoupper($key)."','".  
addslashes($value)."');\n";  
             $string = "<?php\n".$data."\n?>";  
         }  
     }  
     $strlen = file_put_contents(PHPCMS_CACHEDIR.$file, $string,FILE_APPEND);  //最好加上FILE_APPEND，否则tail -f出现
tail: /tmp/friendviews.txt: file truncated   参看：http://www.xiangdong.org/blog/post/1614/
       chmod(PHPCMS_CACHEDIR.$file, 0777);  
       return $strlen;  
}

<?php
        $a = array ( 1 , 2 , array ( "a" , "b" , "c" ));
        $file_string = var_export ( $a,True);
        var_dump($file_string);
        file_put_contents("/tmp/friendviews.txt",$file_string,FILE_APPEND);
        exit;

?>

tail -f /tmp/friendviews.txt

<?php
function Post($url, $post = null)
{
    $context = array();

    if (is_array($post))
    {
        ksort($post);

        $context['http'] = array
        (
            'method' => 'POST',
            'content' => http_build_query($post, '', '&'),
        );
    }

    return file_get_contents($url, false, stream_context_create($context));
}

$data = array
(
    'name' => 'test',
    'email' => 'test@gmail.com',
    'submit' => 'submit',
);

echo Post('http://localhost/5-5/request_post_result.php', $data);
?>

<?php
echo $_POST['name'];
echo $_POST['email'];
echo $_POST['submit'];
echo "fdfd";
?>

<?PHP
/*
CREATE TABLE `category` (
`categoryID` int(10) unsigned NOT NULL auto_increment,
`categoryParentID` int(10) unsigned NOT NULL default '0',
`categoryName` varchar(50) NOT NULL default '',
KEY `cate_id` (`categoryID`)
) TYPE=MyISAM AUTO_INCREMENT=11 ;

#
# 导出表中的数据 `category`
#

INSERT INTO `category` VALUES (1, 0, '一级类别1');
INSERT INTO `category` VALUES (2, 1, '二级类别1');
INSERT INTO `category` VALUES (3, 1, '二级类别2');
INSERT INTO `category` VALUES (4, 1, '二级类别3');
INSERT INTO `category` VALUES (5, 2, '三级类别21');
INSERT INTO `category` VALUES (6, 2, '三级类别22');
INSERT INTO `category` VALUES (7, 2, '三级类别23');
INSERT INTO `category` VALUES (8, 3, 'rfwesdfsd');
INSERT INTO `category` VALUES (9, 4, '54534w43');
INSERT INTO `category` VALUES (10, 5, '66666');
有问题请不要问我就行了。其他OK。欢迎修改使用。这是简单的。

*/
mysql_connect( "localhost", 'root', '' );
mysql_select_db( "test3" );
$cate_table = "category";

function _GetCategory( $category_id = 0, $depth = 1 )
{
global $cate_table;

$sql = "SELECT * FROM $cate_table ORDER BY categoryID DESC";
$result = mysql_query( $sql );

while ( $row = mysql_fetch_array( $result ) )
{
$array[$row[categoryParentID]][$row[categoryID]]
= array(
'id' => $row[categoryID],
'parent' => $row[categoryParentID],
'name' => $row[categoryName]
);
}

if ( !isset( $array[$category_id] ) )
{
return "";
}

foreach( $array[$category_id] AS $key => $category )
{
echo " <OPTION VALUE=".$category['id']." ";
if ( $category['parent'] == 0 )
{
echo " class='main' ";
}
if ( $depth > 1 )
{
echo ">" . str_repeat( "--", $depth - 1 ) . " " . $category['name'] . "</option>n";
}
else
{
echo ">" . $category['name'] . "</option>\n";
}

_GetCategory( $key, $depth + 1 );
}
unset( $array[$category_id] );
}

?>
<select name="categoryID">
<option selected value="">-------------</option>
<?=_GetCategory();?>
</select>

<?php
// --------------------------------------------------------------------------
// File name   : RS232_Server.php
// Description : RS232演示上位机程序
// Requirement : PHP 5.1.4 (cli) (http://www.php.net)
//
// Copyright(C), HonestQiao, 2006, All Rights Reserved.
//
// Author: HonestQiao (honestqiao@hotmail.com/QQ:5601680)
//
// 程序简介：
// 本程序与RS232_Client构成一个完整的演示系统，展示了PHP在RS232串口通讯上的应用。
// 程序之中实现了一个基础但是完整的RS232通讯协议(HQB232)，通讯协议格式如下：
// 协议内容：
//             C->S 01 //请求通讯
//             S->C 02 //响应通讯
//             C->S LEN DATA //LEN表示数据(DATA)长度 DATA表示实际数据
//             C->S 03 //结束通讯
// 说明：S表示上位机 C表示下位机
//       HQB232表示HonestQiao演示的基础(Base)RS232通讯协议，包含了协议的
//   请求和响应，数据帧的结构。
//       演示过程为通讯的请求和响应，文件的发送(数据帧)， 通讯的结束
//       数据帧的结构为当前的当前数据的长度，数据的HEX字符串(两位补足)
//        
//       欢迎探讨PHP在RS232串口通讯上的应用。
// --------------------------------------------------------------------------
set_time_limit(0);
exec('mode COM1: baud=9600 data=8 stop=1 parity=n xon=on');

$fd = dio_open('COM1:', O_RDWR);
if(!$fd)
{
    die("Error when open COM1");
}

$ff = dio_stat($fd);print_r($ff);
echo "HQB232 SERVER is listenning on COM1\n";
/// read
$len = 2;
$t=0;while (($t++)<1000)
{
    $data = dio_read($fd, $len);
    if ($data) {
        if($data==chr(0).chr(1)){
            echo "S_RECV:01\n";
            echo "S_SEND:02\n";
            dio_write($fd,chr(0).chr(2));
            break;
        }
    }
}

$handle = fopen("E:\\RS232\\TEST\\S_WAPMMonitor.exe", 'w');
/// read
$len = 2;
$t=0;while ($handle && ($t++)<1000)
{
    $len = 2;
    $data = dio_read($fd, $len);
    if($data==chr(0).chr(3)){
        echo "S_RECV:03\n";
        break;
    }
    elseif ($data) {
        $len = hexdec($data);
        if($len>0)
        {
        $data = dio_read($fd, $len);
        if($data){
            fwrite($handle, str2hex($data));
            echo "S_RECV:($len) ".microtime()."\n";
        }
        }
    }
}
fclose($handle);
dio_close($fd);

function str2hex($string)
{
    $str = '';
    for($i=0; $i<strlen($string); $i+=2){
        $str .= chr(hexdec(substr($string,$i,2)));
    }
    return $str;
}
?>

<?php
// --------------------------------------------------------------------------
// File name   : RS232_Client.php
// Description : RS232演示下位机程序
// Requirement : PHP 5.1.4 (cli) (http://www.php.net)
//
// Copyright(C), HonestQiao, 2006, All Rights Reserved.
//
// Author: HonestQiao (honestqiao@hotmail.com/QQ:5601680)
//
// 程序简介：
// 本程序与RS232_Server构成一个完整的演示系统，展示了PHP在RS232串口通讯上的应用。
// 程序之中实现了一个基础但是完整的RS232通讯协议(HQB232)，通讯协议格式如下：
// 协议内容：
//             C->S 01 //请求通讯
//             S->C 02 //响应通讯
//             C->S LEN DATA //LEN表示数据(DATA)长度 DATA表示实际数据
//             C->S 03 //结束通讯
// 说明：S表示上位机 C表示下位机
//       HQB232表示HonestQiao演示的基础(Base)RS232通讯协议，包含了协议的
//   请求和响应，数据帧的结构。
//       演示过程为通讯的请求和响应，文件的发送(数据帧)， 通讯的结束
//       数据帧的结构为当前的当前数据的长度，数据的HEX字符串(两位补足)
//        
//       欢迎探讨PHP在RS232串口通讯上的应用。
// --------------------------------------------------------------------------
set_time_limit(0);
exec('mode COM2: baud=9600 data=8 stop=1 parity=n xon=on');

$fd = dio_open('COM2:', O_RDWR);
if(!$fd)
{
    die("Error when open COM2");
}

$ff = dio_stat($fd);print_r($ff);
echo "HQB232 CLIENT is start on COM2\n";
dio_write($fd,chr(0).chr(1));echo "C_SEND:01\n";
$len = 2;
$t=0;while(($t++)<1000)
{
    $data = dio_read($fd, $len);
    if($data==chr(0).chr(2)){
        echo "C_RECV:02\n";    
        break;
    }
}
/*
$len = 2;
$t=0;while(($t++)<10)
{
    $sdata = sprintf("%03d",$t) . "=" . microtime() . " (" . randomkeys(rand(0,35)) . ")";
    $slen = strlen($sdata);
    $stxlen = sprintf("%02d",$slen);
    dio_write($fd,"$stxlen");
    dio_write($fd,"$sdata");echo "C_SEND:($stxlen)$sdata\n";
    //sleep(1);
}
*/

$handle = fopen ("E:\\RS232\\TEST\\WAPMMonitor.exe", "rb");
$data = "";
while ($handle && !feof($handle)) {
  $sdata = fread($handle, 127);
  $sdata = hex2str($sdata);
  $slen = strlen($sdata);
  $stxlen = sprintf("%02X",$slen);
  dio_write($fd,"$stxlen");
  dio_write($fd,"$sdata");echo "C_SEND:($slen) ".microtime()."\n";
  usleep(300);
}
fclose($handle);


dio_write($fd,chr(0).chr(3));echo "C_SEND:03\n";
dio_close($fd);

function randomkeys($length)
  {
   $pattern = "1234567890abcdefghijklmnopqrstuvwxyz";
   for($i=0;$i<$length;$i++)
   {
     $key .= $pattern{rand(0,35)};
   }
   return $key;
}

function hex2str($hexstring)
{
    $str = '';
    for($i=0; $i<strlen($hexstring); $i++){
        $str .= sprintf("%02X",ord(substr($hexstring,$i,1)));
    }
    return $str;
}
?>