Undefined index with submit button in PHP

undefined index php
undefined index: submit
undefined index php _post
undefined index uname
undefined index error in php mysql
undefined index in php _get
undefined index fullname
notice: undefined variable: data in

This is the first page: Index.php

<!DOCTYPE html>

  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

  <form name="Index" action="Result.php" method="POST">
    Username: <input type="text" name="username" id="username" autocomplete="off"><br><br> 1. I identify my gender as... <br> &ensp;&ensp;
    <input type="radio" name="gender" value="male">Male<br> &ensp;&ensp;
    <input type="radio" name="gender" value="female">Female<br> &ensp;&ensp;
    <input type="radio" name="gender" value="others">Others<br><br>
    <input type="submit" a href="Test2.php" name="submit" value="Submit">

<form action="Report.php" method="GET">
  Name: <input type=text name=username size=20><br><br>

// script
function GetParam(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));

console.log(GetParam('username')); // will get the username query in the url

Undefined Index in simple form - PHP, Hi, I'm a newbie and struck at this point, please help me. [COLOR="Red"]here is the code:[/COLOR] <?php $submit =$_POST["submit"]; $fname  Hmm.. It seems to be overriding the rest of the actual registration process, If I fill out the form and press register the form is cleared.. no visible info added to mysql database: Users

Your GetParam(username) is accepting argument but while invoking GetParam(); you don't have parameter. Remove username form GetParam(username) you don't to pass the username since you are getting it from query string.

function GetParam() {
    var start = location.search.indexOf("?" + username + "=");
    if (start < 0) start = location.search.indexOf("&" + username + "=");
    if (start < 0) return '';
    start += username.length + 2;
    var end = location.search.indexOf("&", start) - 1;
    if (end < 0) end = location.search.length;
    var result = '';
    for (var i = start; i <= end; i++) {
        var c = location.search.charAt(i);
        result = result + (c == '+' ? ' ' : c);
    return unescape(result);
result = GetParam();
username = unescape(result["username"]);
document.write("Hi " + username + "<br>");

With PHP you can get the parameter with $_GET[]

 print("Hi ".$_GET["username"]);   

Undefined index from a <form> post - PHP, Hi, I have a form on 'contact.php' which posts to 'thankyou.php' page that contains a function to capture the form ouput and write to a file. I can't see any thing  $ _POST or $ _GET are two special PHP functions that are used to get variables from a user-filled form. While using these functions, a user may encounter an error, stating that there is an undefined index.

Initialize a form as below in your html

<form method = "get" action="phpFileName.php">
    <input type="text" value="" name="name" placeholder="name"/>
    <input type="submit" value="submit" name="submit"/>

in your php file phpFileName.php script as below


 print("Welcome ".$_GET["name"]);   

[RESOLVED] Undefined index: submit, $_POST['submit']) { echo "<table border=\"0\" cellspacing=\"3\" cellpadding=\"3\">"​; echo "<form method=\"Post\" action=\"Register.php\">"; echo "<  The reason to not use isset is given in the PHP manual on that documentation page. “ isset () does not return TRUE for array keys that correspond to a NULL value, while array_key_exists () does.” isset is a leftover from a bygone era of PHP where we were a lot less careful with return types etc because of dynamic typing.

Why do I have undefined index in PHP with $_GET or $_POST , Why do I have undefined index in PHP with $_GET or $_POST method even though my html form has a name and a value? Stack Overflow en español es un sitio de preguntas y respuestas para programadores y profesionales de la informática. Solo te toma un minuto registrarte.

PHP Notice: Undefined index: Submit. I don't get why even after few , PHP Notice: Undefined index: Submit. I don't get why even after few The form itself is perfectly working, it modify the file like I want. The only issue is the notice. As a result, they end up with nasty undefined index errors. Simply put: Your PHP code must be able to handle instances where no radio button was submitted. The user might not tick one of your radio buttons or worse: They might open up developer tools and remove the radio buttons altogether. HTML forms can be easily modified.

How to fix both undefined index and undefined variable in PHP , I'm new for the php. I created a multiple forms when i click submit button show "​submitted successfully".And I create multi query for insert data to  In this session we will design an html form ,add the data into it and submit it to the database by connecting it to MySQL database using php. To design the html form follow the steps given below : Install the Xampp server in your machine and if it already installed just go to xampp -> htdocs folder .