➜ /Users/zyj >dig +trace my.oschina.net

; <<>> DiG 9.8.3-P1 <<>> +trace my.oschina.net
;; global options: +cmd
.			191557	IN	NS	e.root-servers.net.
.			191557	IN	NS	i.root-servers.net.
.			191557	IN	NS	a.root-servers.net.
.			191557	IN	NS	k.root-servers.net.
.			191557	IN	NS	g.root-servers.net.
.			191557	IN	NS	j.root-servers.net.
.			191557	IN	NS	h.root-servers.net.
.			191557	IN	NS	c.root-servers.net.
.			191557	IN	NS	l.root-servers.net.
.			191557	IN	NS	f.root-servers.net.
.			191557	IN	NS	d.root-servers.net.
.			191557	IN	NS	b.root-servers.net.
.			191557	IN	NS	m.root-servers.net.
;; Received 228 bytes from 114.114.114.114#53(114.114.114.114) in 39 ms

net.			172800	IN	NS	m.gtld-servers.net.
net.			172800	IN	NS	l.gtld-servers.net.
net.			172800	IN	NS	k.gtld-servers.net.
net.			172800	IN	NS	j.gtld-servers.net.
net.			172800	IN	NS	i.gtld-servers.net.
net.			172800	IN	NS	h.gtld-servers.net.
net.			172800	IN	NS	g.gtld-servers.net.
net.			172800	IN	NS	f.gtld-servers.net.
net.			172800	IN	NS	e.gtld-servers.net.
net.			172800	IN	NS	d.gtld-servers.net.
net.			172800	IN	NS	c.gtld-servers.net.
net.			172800	IN	NS	b.gtld-servers.net.
net.			172800	IN	NS	a.gtld-servers.net.
;; Received 489 bytes from 198.41.0.4#53(198.41.0.4) in 136 ms

oschina.net.		172800	IN	NS	ns1.dnsv2.com.
oschina.net.		172800	IN	NS	ns2.dnsv2.com.
;; Received 205 bytes from 192.52.178.30#53(192.52.178.30) in 558 ms

my.oschina.net.		86400	IN	CNAME	www.oschina.net.
oschina.net.		7200	IN	NS	ns1.dnsv2.com.
oschina.net.		7200	IN	NS	ns2.dnsv2.com.
;; Received 115 bytes from 183.60.59.230#53(183.60.59.230) in 15 ms

Remote Address:112.124.5.74:80
Request URL:http://my.oschina.net/u/128568/blog
Request Method:GET
Status Code:200 OK

#请求头信息
Request Headers
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip,deflate,sdch
Accept-Language:zh-CN,zh;q=0.8,en;q=0.6
Connection:keep-alive
Cookie:
oscid=Zka95GnBtcz%2FTWwBZdIK1f%2BrZzKNNUN0vu5av2CocDrEpbLcUPBTht%2FIFGWopqXUjIysP943EaQtn4%2FJdlcX%2FOW65EUP%2Fgo7fzPdxBwqLALbq7SVBQoTFw%3D%3D
Host:my.oschina.net
User-Agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36

#响应头信息
Response Headers
Cache-Control:must-revalidate, no-cache, private
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/html;charset=UTF-8
Date:Sun, 25 May 2014 05:23:43 GMT
Expires:Sun, 1 Jan 2000 01:00:00 GMT
Pragma:no-cache
Server:Tengine/1.4.6
Transfer-Encoding:chunked
Vary:Accept-Encoding

<form action="welcome.php" method="post">
Name: <input type="text" name="fname">
Age: <input type="text" name="age">
<input type="submit">
</form>

Welcome <?php echo $_REQUEST["fname"]; ?>!<br>
You are <?php echo $_REQUEST["age"]; ?> years old.

<form action="welcome.php" method="get">
Name: <input type="text" name="fname">
Age: <input type="text" name="age">
<input type="submit">
</form>

代码如下:

<?php 
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; 
var_dump(json_decode($json)); 
var_dump(json_decode($json, true)); 
?>

object(stdClass)#1 (5) { 
["a"] => int(1) 
["b"] => int(2) 
["c"] => int(3) 
["d"] => int(4) 
["e"] => int(5) 
} 

array(5) { 
["a"] => int(1) 
["b"] => int(2) 
["c"] => int(3) 
["d"] => int(4) 
["e"] => int(5) 
}

 代码如下:

$data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]'; 
echo json_decode($data);

 代码如下:

Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

 代码如下:

echo json_decode($data,true);

 代码如下:

Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

 代码如下:

<?php 
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5); 

echo json_encode($arr); 
?>

 代码如下:

{"a":1,"b":2,"c":3,"d":4,"e":5}

 代码如下:

<?php 
$a = array('<foo>',"'bar'",'"baz"','&blong&', "\xc3\xa9"); 

echo "Normal: ", json_encode($a), "\n"; 
echo "Tags: ", json_encode($a, JSON_HEX_TAG), "\n"; 
echo "Apos: ", json_encode($a, JSON_HEX_APOS), "\n"; 
echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "\n"; 
echo "Amp: ", json_encode($a, JSON_HEX_AMP), "\n"; 
echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "\n"; 
echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "\n\n"; 

$b = array(); 

echo "Empty array output as array: ", json_encode($b), "\n"; 
echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "\n\n"; 

$c = array(array(1,2,3)); 

echo "Non-associative array output as array: ", json_encode($c), "\n"; 
echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "\n\n"; 

$d = array('foo' => 'bar', 'baz' => 'long'); 

echo "Associative array always output as object: ", json_encode($d), "\n"; 
echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "\n\n"; 
?>

 代码如下:

Normal: ["<foo>","'bar'","\"baz\"","&blong&","\u00e9"] 
Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&","\u00e9"] 
Apos: ["<foo>","\u0027bar\u0027","\"baz\"","&blong&","\u00e9"] 
Quot: ["<foo>","'bar'","\u0022baz\u0022","&blong&","\u00e9"] 
Amp: ["<foo>","'bar'","\"baz\"","\u0026blong\u0026","\u00e9"] 
Unicode: ["<foo>","'bar'","\"baz\"","&blong&","é"] 
All: ["\u003Cfoo\u003E","\u0027bar\u0027","\u0022baz\u0022","\u0026blong\u0026","é"] 

Empty array output as array: [] 
Empty array output as object: {} 

Non-associative array output as array: [[1,2,3]] 
Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}} 

Associative array always output as object: {"foo":"bar","baz":"long"} 
Associative array always output as object: {"foo":"bar","baz":"long"}

 代码如下:

<?php 
echo "连续数组".PHP_EOL; 
$sequential = array("foo", "bar", "baz", "blong"); 
var_dump( 
$sequential, 
json_encode($sequential) 
); 

echo PHP_EOL."非连续数组".PHP_EOL; 
$nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong"); 
var_dump( 
$nonsequential, 
json_encode($nonsequential) 
); 

echo PHP_EOL."删除一个连续数组值的方式产生的非连续数组".PHP_EOL; 
unset($sequential[1]); 
var_dump( 
$sequential, 
json_encode($sequential) 
); 
?>

 代码如下:

连续数组 
array(4) { 
[0]=> 
string(3) "foo" 
[1]=> 
string(3) "bar" 
[2]=> 
string(3) "baz" 
[3]=> 
string(5) "blong" 
} 
string(27) "["foo","bar","baz","blong"]" 

非连续数组 
array(4) { 
[1]=> 
string(3) "foo" 
[2]=> 
string(3) "bar" 
[3]=> 
string(3) "baz" 
[4]=> 
string(5) "blong" 
} 
string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}"

 代码如下:

$obj->Name= 'a1';$obj->Number ='123'; 
$obj->Contno= '000'; 
echo json_encode($obj);

 代码如下:

{"Name":"a1", 
"Number":"123", 
"Contno":"000" 
}

Name: <input type="text" name="name" value="<?php echo $name;?>">

E-mail: <input type="text" name="email" value="<?php echo $email;?>">

Website: <input type="text" name="website" value="<?php echo $website;?>">

Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>

Gender:
<input type="radio" name="gender"
<?php if (isset($gender) && $gender=="female") echo "checked";?>
value="female">Female
<input type="radio" name="gender"
<?php if (isset($gender) && $gender=="male") echo "checked";?>
value="male">Male

<!DOCTYPE HTML> 
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body> 

<?php
// define variables and set to empty values
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
   if (empty($_POST["name"]))
     {$nameErr = "Name is required";}
   else
     {
     $name = test_input($_POST["name"]);
     // check if name only contains letters and whitespace
     if (!preg_match("/^[a-zA-Z ]*$/",$name))
       {
       $nameErr = "Only letters and white space allowed"; 
       }
     }
   
   if (empty($_POST["email"]))
     {$emailErr = "Email is required";}
   else
     {
     $email = test_input($_POST["email"]);
     // check if e-mail address syntax is valid
     if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
       {
       $emailErr = "Invalid email format"; 
       }
     }
     
   if (empty($_POST["website"]))
     {$website = "";}
   else
     {
     $website = test_input($_POST["website"]);
     // check if URL address syntax is valid (this regular expression also allows dashes in the URL)
     if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
       {
       $websiteErr = "Invalid URL"; 
       }
     }

   if (empty($_POST["comment"]))
     {$comment = "";}
   else
     {$comment = test_input($_POST["comment"]);}

   if (empty($_POST["gender"]))
     {$genderErr = "Gender is required";}
   else
     {$gender = test_input($_POST["gender"]);}
}

function test_input($data)
{
     $data = trim($data);
     $data = stripslashes($data);
     $data = htmlspecialchars($data);
     return $data;
}
?>

<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field.</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
   Name: <input type="text" name="name" value="<?php echo $name;?>">
   <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
   E-mail: <input type="text" name="email" value="<?php echo $email;?>">
   <span class="error">* <?php echo $emailErr;?></span>
   <br><br>
   Website: <input type="text" name="website" value="<?php echo $website;?>">
   <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
   <br><br>
   Gender:
   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">Female
   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">Male
   <span class="error">* <?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>

<?php
echo "<h2>Your Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>

</body>
</html>

$name = test_input($_POST["name"]);
if (!preg_match("/^[a-zA-Z ]*$/",$name))
  {
  $nameErr = "只允许字母及空格"; 
  }

$email = test_input($_POST["email"]);
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
  {
  $emailErr = "非法邮件地址"; 
  }

$website = test_input($_POST["website"]);
if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
  {
  $websiteErr = "不合法的 URL"; 
  }

<?php
// 定义变量并设为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
  if (empty($_POST["name"]))
    {$nameErr = "Name is required";}
  else
    {
    $name = test_input($_POST["name"]);
    // check if name only contains letters and whitespace
    if (!preg_match("/^[a-zA-Z ]*$/",$name))
      {
      $nameErr = "Only letters and white space allowed"; 
      }
    }

  if (empty($_POST["email"]))
    {$emailErr = "Email is required";}
  else
    {
    $email = test_input($_POST["email"]);
    // check if e-mail address syntax is valid
    if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
      {
      $emailErr = "Invalid email format"; 
      }
    }

  if (empty($_POST["website"]))
    {$website = "";}
  else
    {
    $website = test_input($_POST["website"]);
    // check if URL address syntax is valid (this regular expression also allows dashes in the URL)
    if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
      {
      $websiteErr = "Invalid URL"; 
      }
    }

  if (empty($_POST["comment"]))
    {$comment = "";}
  else
    {$comment = test_input($_POST["comment"]);}

  if (empty($_POST["gender"]))
    {$genderErr = "Gender is required";}
  else
    {$gender = test_input($_POST["gender"]);}
}
?>

Name: <input type="text" name="name">
E-mail: <input type="text" name="email">
Website: <input type="text" name="website">
Comment: <textarea name="comment" rows="5" cols="40"></textarea>

Gender:
<input type="radio" name="gender" value="female">Female
<input type="radio" name="gender" value="male">Male

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
该表单使用 method="post" 方法来提交数据。
Note	什么是 $_SERVER["PHP_SELF"] 变量?

指定以下表单文件名为 "test_form.php":
<form method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
现在，我们使用URL来指定提交地址 "test_form.php",以上代码修改为如下所示:
<form method="post" action="test_form.php">
这样做就很好了。
但是，考虑到用户会在浏览器地址栏中输入以下地址:
http://www.runoob.com/test_form.php/%22%3E%3Cscript%3Ealert('hacked')%3C/script%3E
以上的 URL 中，将被解析为如下代码并执行：
<form method="post" action="test_form.php/"><script>alert('hacked')</script>
代码中添加了 script 标签，并添加了alert命令。 当页面载入时会执行该Javascript代码（用户会看到弹出框）。 这仅仅只是一个简单的实例来说明PHP_SELF变量会被黑客利用。

<script>location.href('http://www.runoob.com')</script>

<?php
// 定义变量并默认设置为空值
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")
{
  $name = test_input($_POST["name"]);
  $email = test_input($_POST["email"]);
  $website = test_input($_POST["website"]);
  $comment = test_input($_POST["comment"]);
  $gender = test_input($_POST["gender"]);
}

function test_input($data)
{
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>

<?php
// 定义变量并默认设为空值
$nameErr = $emailErr = $genderErr = $websiteErr = "";
$name = $email = $gender = $comment = $website = "";

if ($_SERVER["REQUEST_METHOD"] == "POST")
{

  if (empty($_POST["name"]))
    {$nameErr = "Name is required";}
  else
    {$name = test_input($_POST["name"]);}

  if (empty($_POST["email"]))
    {$emailErr = "Email is required";}
  else
    {$email = test_input($_POST["email"]);}

  if (empty($_POST["website"]))
    {$website = "";}
  else
    {$website = test_input($_POST["website"]);}

  if (empty($_POST["comment"]))
    {$comment = "";}
  else
    {$comment = test_input($_POST["comment"]);}

  if (empty($_POST["gender"]))
    {$genderErr = "Gender is required";}
  else
    {$gender = test_input($_POST["gender"]);}
}
?>

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">

Name: <input type="text" name="name">
<span class="error">* <?php echo $nameErr;?></span>
<br><br>
E-mail:
<input type="text" name="email">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
Website:
<input type="text" name="website">
<span class="error"><?php echo $websiteErr;?></span>
<br><br>
<label>Comment: <textarea name="comment" rows="5" cols="40"></textarea>
<br><br>
Gender:
<input type="radio" name="gender" value="female">Female
<input type="radio" name="gender" value="male">Male
<span class="error">* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="Submit"> 

</form>