带有IF语句的PHP简单表单(PHP Simple form with IF Statement)

带有IF语句的PHP简单表单(PHP Simple form with IF Statement)

我是PHP的新手，目前正致力于开发我的第一个表单。 使用下面的代码示例，我试图实现两件事。

如果表格中填写了“姓名”或“电子邮件”的字段，则会发布“您的姓名是：”名称“和”您的电子邮件是：“电子邮件”。 如果没有填写字段，那么它将根本不显示任何内容。

我认为这需要用IF语句来完成，但是如果字段为空，我很难找到显示协议的任何内容。 任何帮助将不胜感激。

<form action="Test.php" method="post"> Name: <input type="text" name="name"><br> E-mail: <input type="text" name="email"><br> <input type="submit"> </form> <?php $name = $_POST["name"]; if($name="name") { echo "Your name is: $_POST["name"]" ; } else { echo ""; } ?> <br> <?php $email = $_POST["email"]; if($email = "email") { echo "Your email is: $_POST["email"]" ; } else { echo ""; } ?>

I am very new to PHP and currently working on developing my first form. With the below code sample I am trying to achieve two things.

If the fields for "name" or "email" are filled out in the form, then it will post "Your name is: "name" and "Your email is:"email". If a field is not filled out, then it will display nothing at all.

I believe this needs to be done with an IF statement but I am having a hard time finding anything showing the protocol for if the field is empty. Any help would be greatly appreciated.

<form action="Test.php" method="post"> Name: <input type="text" name="name"><br> E-mail: <input type="text" name="email"><br> <input type="submit"> </form> <?php $name = $_POST["name"]; if($name="name") { echo "Your name is: $_POST["name"]" ; } else { echo ""; } ?> <br> <?php $email = $_POST["email"]; if($email = "email") { echo "Your email is: $_POST["email"]" ; } else { echo ""; } ?>

最满意答案

您的条件语句不正确。

您现在正在使用= with ($name="name")和($email = "email")进行分配，当您应该使用==检查某些内容是否“等于”时。

另外，正如Marc B stated in his comment ： “你不能在"引用字符串中使用"引号" ，也不允许在"引用字符串......”中使用引用的数组键。

但是，如果你要保持这种策略; ie： if($name=="name")那么只有在表格的输入中输入了name和email ，您的表单才有效。

有几种方法可以实现这一点，使用if(!empty检查某个字段是否为空if(!empty或如果设置为if(isset 。

在这种情况下，我使用if(!empty 。意思是，如果字段不为空，那么之后回显结果。

这是一个基本的例子:(还有其他方法可以达到相同的效果）

<form action="Test.php" method="post"> Name: <input type="text" name="name"><br> E-mail: <input type="text" name="email"><br> <input type="submit"> </form> <?php $name = $_POST['name']; if(!empty($_POST['name'])) { echo "Your name is: " . $name; } else { echo ""; } ?> <br> <?php $email = $_POST['email']; if(!empty($_POST['email'])) { echo "Your email is: " . $email; } else { echo ""; } ?>

Your conditional statements are incorrect.

You're presently making an assignment using = with ($name="name") and ($email = "email") when you should be checking if something is "equal to" using ==.

Also, as Marc B stated in his comment: "you can NOT use " quotes within a " quoted string, nor are you allowed to use quoted array keys within " quoted strings..."

However, if you were to keep that strategy; i.e.: if($name=="name") then your form would only work if the words name and email were entered in the form's inputs.

There are a few ways to achieve this, checking if a field is (not) empty using if(!empty or if it is set if(isset.

In this case, I used if(!empty. Meaning, that if the fields are not empty, then echo the results afterwards.

This is a basic example: (There are other ways to achieve the same result)

<form action="Test.php" method="post"> Name: <input type="text" name="name"><br> E-mail: <input type="text" name="email"><br> <input type="submit"> </form> <?php $name = $_POST['name']; if(!empty($_POST['name'])) { echo "Your name is: " . $name; } else { echo ""; } ?> <br> <?php $email = $_POST['email']; if(!empty($_POST['email'])) { echo "Your email is: " . $email; } else { echo ""; } ?>