When PHP accepts information submitted through an HTML form, it will save the submitted data in a global array. We can call the system-specific automatic global variable array to obtain these values. Commonly used automatic global variables are as follows:
$_GET
$_POST
$_REQUEST
In obtaining form data, the most commonly used automatic global variables are $_GET and $_POST, which obtain data submitted through the GET method and data submitted through the POST method respectively. For example, if a text box form control named "txtAge" is submitted using the GET method, you can use
$_GET["txtAge"] or $_GET['txtAge']
Get the value it submitted.
The $_REQUEST automatic global variable contains all GET, POST, COOKIE and FILE data. If you don’t care about the data source, you can use
$_REQUEST["txtAge"] or $_REQUEST['txtAge'] to get the submitted data.
The following is a simple example of obtaining submitted data:
<?php
echo("你的帐号是：" . $_POST['login']);   //输出帐号
echo("<br>");
echo("你的姓名是：" .$_POST['yourname'] );   //输出姓名
echo( "<br>");
echo("你的密码是：" . $_POST['passwd']   );   //输出密码
echo("<br>");
echo("你的查询密码问题是：" . $_POST['question']   );   //查询密码问题
echo("<br>");
echo("你的查询密码答案是：" . $_POST['question2']    );   //查询密码答案
echo("<br>");
echo("你的出生日期是：" . $_POST['byear'] ."年". $_POST['bmonth'] . "月" . $_POST['bday'] . "日"    );   //出生日期
echo("<br>");
echo("你的性别是：" . $_POST['gender']);   //性别
echo("<br>");
echo("你的爱好是：<br>"   );   //爱好
foreach ($_POST['hobby'] as $hobby) {
   echo($hobby . "<br>");
}
?> 
 
相应的表单代码如下:
<html>
<head>
<title>
用户调查表
</title>
</head>
<body>
欢迎光临本网站，请首先输入以下个人资料：<br>
<form method=post action="baidu.php">
帐号：<INPUT maxLength=25 size=16 name=login><br>
姓名：<INPUT type=password size=19 name=yourname ><br>
密码：<INPUT type=password size=19 name=passwd ><br>
确认密码：<INPUT type=password size=19 name=passwd ><br>
查询密码问题：<br>
<select name=question>
<option selected value="">--请您选择--</option>
<option value="我的宠物名字？">我的宠物名字？</option>
<option value="我最好的朋友是谁？">我最好的朋友是谁？</option>
<option value="我最喜爱的颜色？">我最喜爱的颜色？</option>
<option value="我最喜爱的电影？">我最喜爱的电影？</option>
<option value="我最喜爱的影星？">我最喜爱的影星？</option>
<option value="我最喜爱的歌曲？">我最喜爱的歌曲？</option>
<option value="我最喜爱的食物？">我最喜爱的食物？</option>
<option value="我最大的爱好？">我最大的爱好？</option>
</select>
<br>
查询密码答案：<input name="question2" size="18"><br>
出生日期：
   <select name="byear" id="BirthYear" tabindex=8>
     <?php
  for($i=1930;$i<=2009;$i++){
  echo "<option value='$i'>" . $i ."年</option>";
  }
  ?>
   </select>
     <select name="bmonth" id="BirthYear" tabindex=8>
     <?php
  for($i=1;$i<=12;$i++){
  echo "<option value='$i'>" . $i ."月</option>";
  }
  ?>
   </select>
     <select name="bday" id="BirthYear" tabindex=8>
     <?php
  for($i=1;$i<=30;$i++){
  echo "<option value='$i'>" . $i ."日</option>";
  }
  ?>
   </select>
<br>
性别：<input type="radio" name="gender" value="1" checked>
       男
       <input type="radio" name="gender" value="2" >
       女
<br>
请选择你的爱好：<br>
<input type="checkbox" name="hobby[]" value="dance" >跳舞<br>
<input type="checkbox" name="hobby[]" value="tour" >旅游<br>
<input type="checkbox" name="hobby[]" value="sing" >唱歌<br>
<input type="checkbox" name="hobby[]" value="dance" >打球<br>
<input type="submit"   value="提交">
<input type="reset"   value="重填">
<br>
</body>
<html>
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