Question

我承认我是新手，但是我花了两天的时间尝试获取以下代码，以便在按下提交按钮时回显“按下或未按下”。我删除了所有不相关的代码，并留在下面。这是非常基本的东西，我读过的每个论坛都建议我的代码是正确的。我只是使用带有Windows 10和IE连接到WAMP服务器的笔记本电脑。

<!doctype html>
<html>
<head>
<meta charset="iso-8859-1">
<title>SystemAdministrator</title>
<link href="pval.css" rel="stylesheet">
<link href="system_administrator.css" rel="stylesheet">

<?php
//test to see if submit button was pressed or not
if (isset($_post['create_userdb'])) {
   echo 'pressed';
   $username = $_POST['username'];
   echo $username;
} else {
   echo 'not pressed';
   $username = $_POST['username'];
   echo $username;
}
?>

</head>
<body>
<Form name ="form1" Method ="POST" Action ="system_administrator.php">
<INPUT TYPE = "TEXT" VALUE ="username" Name ="username">
<INPUT TYPE = "Submit" Name = "create_userdb" VALUE = "create_userdb">
</FORM>
</body>
</html>

Answer 1

$ _post的打字错误。它应该是$ _POST

if (isset($_POST['create_userdb'])) {
   echo 'pressed';
   $username = $_POST['username'];
   echo $username;
} else {
   echo 'not pressed';
   $username = $_POST['username'];
   echo $username;
}

Answer 2

问题是小写$_post - 它应该低于$_POST

<!doctype html>
<html>
    <head>
        <meta charset="iso-8859-1">
        <title>SystemAdministrator</title>
        <link href="pval.css" rel="stylesheet">
        <link href="system_administrator.css" rel="stylesheet">
        <?php
        if( $_SERVER['REQUEST_METHOD']=='POST' ){
            if ( isset( $_POST['create_userdb'])) {
               echo 'pressed';
               $username = $_POST['username'];
               echo $username;
            } else {
               echo 'not pressed';
               $username = $_POST['username'];
               echo $username;
            }
        }
        ?>
    </head>
    <body>
        <Form name="form1" Method ="POST">
            <INPUT TYPE="TEXT" VALUE="username" Name="username" />
            <INPUT TYPE="Submit" Name="create_userdb" VALUE="create_userdb" />
        </FORM>
    </body>
</html>

Answer 3

$_post错了。您需要$_POST
提交按钮不会向PHP返回值。如果您使用var_dump($_POST)，则可以看到表单中的所有发布数据，create_userdb将不会出现。

如果你想检查按钮是否被按下，你可以简单地检查$ _POST数组：

<?php
//test to see if submit button was pressed or not
if (isset($_POST)) {
   echo 'pressed';
   $username = $_POST['username'];
   echo $username;
} else {
   echo 'not pressed';
   $username = $_POST['username'];
   echo $username;
}
?>

编辑：所以在我的情况下，它没有返回任何东西。 PHP 5.3已安装。

的test.html

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
  <form method="POST" enctype="multipart/form-data" action="test.php">
    <input type="text" value="username" name="username">
    <input type="submit" name="create_userdb" value="create_userdb">
  </form>
</body>
</html>

test.php的

<?php
var_dump($_POST);

输出：

array (size=1)
'username' => string 'username' (length=8)

php isset总是返回false

3 个答案: