Home Backend Development PHP Tutorial Research on PHP form form parameter passing details

Research on PHP form form parameter passing details

Jan 11, 2017 pm 04:26 PM

为什么呢?因为表单的处理有GET和POST两种,怎么在这两种表单中都要传递一直do参数,而且要在后台通过同样的方式获取就一直是个很困惑的问题,今天经过几个小时的实验终于搞懂了,特发此文。 
GET表单: 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
    <meta http-equiv="Content-Type" content="text/html;charset=gbk"/> 
    <title>表单使用GET方式传值</title> 
</head> 
<body> 
    <!-- action中的parm参数的值是无法传递到action-get.php的 --> 
    <form action="action-get.php?parm=url-get" method="get"> 
        <p> 
            姓名:<input type="text" name="name" /> 
            <!-- 隐藏变量传值 --> 
            <input type="hidden" name="hkey" value="hvalue" /> 
            <!-- GET表单的隐藏变量传值可以通过$_GET["do"]获取 --> 
            <input type="hidden" name="do" value="index" /> 
            <!-- submit不设置name属性则不会出现在url中 --> 
            <input type="submit" value="提交"/> 
        </p> 
    </form> 
</body> 
</html>
Copy after login

处理GET表单的PHP:

<pre class="brush:php;toolbar:false"> 
<?php 
    echo "参数 name 的值通过\$_GET获取为 ".$_GET["name"]." ,"; 
    echo "参数 name 的值通过\$_POST获取为 ".$_POST["name"]." ,"; 
    echo "参数 name 的值通过\$_REQUEST获取为 ".$_REQUEST["name"]." .\r\n"; 
    echo "参数 parm 的值通过\$_GET获取为 ".$_GET["parm"]." ,"; 
    echo "参数 parm 的值通过\$_POST获取为 ".$_POST["parm"]." ,"; 
    echo "参数 parm 的值通过\$_REQUEST获取为 ".$_REQUEST["parm"]." .\r\n"; 
    echo "参数 hkey 的值通过\$_GET获取为 ".$_GET["hkey"]." ,"; 
    echo "参数 hkey 的值通过\$_POST获取为 ".$_POST["hkey"]." ,"; 
    echo "参数 hkey 的值通过\$_REQUEST获取为 ".$_REQUEST["hkey"]." .\r\n"; 
    echo "参数 do 的值通过\$_GET获取为 ".$_GET["do"]." ,"; 
    echo "参数 do 的值通过\$_POST获取为 ".$_POST["do"]." ,"; 
    echo "参数 do 的值通过\$_REQUEST获取为 ".$_REQUEST["do"]." .\r\n"; 
?> 
Copy after login
Copy after login

处理结果输出:
参数 name 的值通过$_GET获取为 kj ,参数 name 的值通过$_POST获取为 ,参数 name 的值通过$_REQUEST获取为 kj .
参数 parm 的值通过$_GET获取为 ,参数 parm 的值通过$_POST获取为 ,参数 parm 的值通过$_REQUEST获取为 .
参数 hkey 的值通过$_GET获取为 hvalue ,参数 hkey 的值通过$_POST获取为 ,参数 hkey 的值通过$_REQUEST获取为 hvalue .
参数 do 的值通过$_GET获取为 index ,参数 do 的值通过$_POST获取为 ,参数 do 的值通过$_REQUEST获取为 index .
POST 表单:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
    <meta http-equiv="Content-Type" content="text/html;charset=gbk"/> 
    <title>表单使用POST方式传值</title> 
</head> 
<body> 
    <!-- action中的parm和do参数可以在action-post.php中通过$_GET方式获取 --> 
    <form action="action-post.php?parm=url-post&do=index" method="post"> 
        <p> 
            姓名:<input type="text" name="name" /> 
            <!-- 隐藏变量传值 --> 
            <input type="hidden" name="hkey" value="hvalue" /> 
            <input type="submit" value="提交"/> 
        </p> 
    </form> 
</body> 
</html>
Copy after login

处理 POST 表单的PHP:

<pre class="brush:php;toolbar:false"> 
<?php 
    echo "参数 name 的值通过\$_GET获取为 ".$_GET["name"]." ,"; 
    echo "参数 name 的值通过\$_POST获取为 ".$_POST["name"]." ,"; 
    echo "参数 name 的值通过\$_REQUEST获取为 ".$_REQUEST["name"]." .\r\n"; 
    echo "参数 parm 的值通过\$_GET获取为 ".$_GET["parm"]." ,"; 
    echo "参数 parm 的值通过\$_POST获取为 ".$_POST["parm"]." ,"; 
    echo "参数 parm 的值通过\$_REQUEST获取为 ".$_REQUEST["parm"]." .\r\n"; 
    echo "参数 hkey 的值通过\$_GET获取为 ".$_GET["hkey"]." ,"; 
    echo "参数 hkey 的值通过\$_POST获取为 ".$_POST["hkey"]." ,"; 
    echo "参数 hkey 的值通过\$_REQUEST获取为 ".$_REQUEST["hkey"]." .\r\n"; 
    echo "参数 do 的值通过\$_GET获取为 ".$_GET["do"]." ,"; 
    echo "参数 do 的值通过\$_POST获取为 ".$_POST["do"]." ,"; 
    echo "参数 do 的值通过\$_REQUEST获取为 ".$_REQUEST["do"]." .\r\n"; 
?> 
Copy after login
Copy after login

处理结果输出: 
参数 name 的值通过$_GET获取为 ,参数 name 的值通过$_POST获取为 zkj ,参数 name 的值通过$_REQUEST获取为 zkj . 
参数 parm 的值通过$_GET获取为 url-post ,参数 parm 的值通过$_POST获取为 ,参数 parm 的值通过$_REQUEST获取为 url-post . 
参数 hkey 的值通过$_GET获取为 ,参数 hkey 的值通过$_POST获取为 hvalue ,参数 hkey 的值通过$_REQUEST获取为 hvalue . 
参数 do 的值通过$_GET获取为 index ,参数 do 的值通过$_POST获取为 ,参数 do 的值通过$_REQUEST获取为 index . 
结论: 
   GET表单值可以通过_GET获取;但通过action的url参数设置的参数总是获取不到的 
   POST表单值可以通过_POST获取;但通过action的url参数设置的参数则可以通过_GET获取到 
   同一变量都可以通过_GET获取,但在GET表单中通过隐藏变量设置,在POST表单中则通过action的url参数设置

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