PHP - 表单问题

Question

Yesterday I started my first PHP course. Today reached an impediment in an apparently farily simple task I would appreciate your assistance with.

I have two files: index.php and function.php

Index.php contains the following code:

    <form action="functions.php" method='POST'>
        Insert name: <input type="text" name="name"><br>
        Insert age: <input type="text" name="age"><br>
        <input type=submit value="GO!" onclick="displayNameAndAge()">
    </form>

Via

require 'functions.php';

i include functions.php which contains one single function:

  function displayNameAndAge() {
      if (isset($_POST["name"])) {
        echo $_POST["name"];
      }
      if (isset($_POST["age"])) {
        echo $_POST["age"];
      }
  }

Hence, after filling in the inputs specified in the form, I expect that clicking the button will get the data via the $_POST variable and display the data on the page. Where I did wrong, where am I misunderstanding the tutorial? Thank you in advance.

Answer 1

You are actually mixing php code with jQuery. Php doesn't have any onclick function/event. I have made some changes so try this code.

<form action="functions.php" method='POST'>
    Insert name: <input type="text" name="name"><br>
    Insert age: <input type="text" name="age"><br>
    <input type=submit value="GO!" name="submit">
</form>

in functions.php

 if (isset($_POST["submit"])) {
  if (isset($_POST["name"])) {
    echo $_POST["name"];
  }
  if (isset($_POST["age"])) {
    echo $_POST["age"];
     }
  }

I don't know why and where do you use require 'functions.php';. If you do it in your index.php page then remove it. You form will automatically send data and take you to functions.php page