Notice: Undefined index $

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PHP: “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” 25 answers

Reference - What does this error mean in PHP? 30 answers

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通过使用isset或!empty ：

<?php
    $name    = (isset($_POST['name'])    ? $_POST['name']    : '');
    $email   = (isset($_POST['email'])   ? $_POST['email']   : '');
    $message = (isset($_POST['message']) ? $_POST['message'] : '');
?>

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只需在代码中进行更改即可：

if (isset ($_POST['name'])) {
  $name = $_POST['name'];
}
if (isset ($_POST['email'])) {
  $email = $_POST['email'];
}
if (isset ($_POST['message'])) {
  $message = $_POST['message'];
}

$from = 'From:';
$to = '86376@ict-idcollege.nl';
$subject = 'Hello';

if (isset ($_POST['human'])) {
  $human = $_POST['human'];
}

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place the code you have above inside a test block as follows

 if (isset($_POST['submit'])) {
   $name = $_POST['name'];
   $email = $_POST['email'];
  ...
  until the end of ?>

this is because when ever the page loads without the form submission. (because you have the control logic and display logic in the same file) it executes the code on the top.

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