我在PHP上运行时遇到错误

Question

$submit = $_POST['submit'];

$fullname = strip_tags($_POST['fullname']);

$username = strip_tags($_POST['username']);

$password = strip_tags($_POST['password']);

$repeatpassword = strip_tags($_POST['confirmpassword']);

$date = date ("Y-m-d");

i get **"Notice: Undefined index"**
but when i do this

if(isset($_POST['submit']))
{

$submit = $_POST['submit'];

$fullname = strip_tags($_POST['fullname']);

$username = strip_tags($_POST['username']);

$password = strip_tags($_POST['password']);

$repeatpassword = strip_tags($_POST['confirmpassword']);

$date = date ("Y-m-d");
}

the undefined index gets fixed but Notice: Undefined variable: submit is my new error why is that???

Answer 1

It's notice because you want to use variable which is not set you can fix it by checking it with isset() function

$submit = null;

if(isset($_POST['submit'])
   $submit = $_POST['submit'];

or with short syntax

$submit = isset($_POST['submit']) ? $_POST['submit'] : null;

same applies to other variables passed via $_POST

Answer 2

试试看

$submit = isset ( $_POST ['submit'] ) ? $_POST ['submit'] : null ;

Answer 3

Change:

if(isset($_POST['submit']))

In:

if(isset($_POST) && isset($_POST['submit']))

Answer 4

This is due to no value for 'submit' being passed by POST. Check if $_POST['submit'] is empty prior to assigning its value to a variable.

Answer 5

Do You have in your form

<input type = 'submit' name = 'submit' />

if you have placed only

  <input type = 'submit' /> 

It will not work

Changed it to start with this

<?php

 if(isset($_POST['submit']) != "")
 {

   $submit = $_POST['submit'];
   ......

 }

 ?>