php undefined index – How To Remove Undefined Index Error in PHP Variables?

php undefined index is a minor error. PHP – Handle Undefined Index Gracefully. I am going to explain How to fix a most common error that every programmer face Notice: Undefined index: Name in C:\xampp\htdocs\demo\signup.php on line 216

php undefined index – Undefined index”, and “Notice: Undefined offset” using PHP

how to solve undefined index error in php? – Notice: Undefined Index error in PHP there is a variable or constant that has no value assigned to it.

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How to fix this error?

<?php
error_reoprting(0); 
?>

Fix Undefined Index Error

This may show Undefined index error.

<?php
$product_name = $_POST['product_name']; 
?>

Change this code to

<?php
if (isset($_POST['product_name'])) {
    $product_name = $_POST['product_name'];
}
?>

don’t miss : Undefined Offset In Php

Same for $_GET[‘product_name’] and $_REQUEST[‘product_name’]

<?php
if (isset($_GET['product_name'])) {
    $var = $_GET['product_name'];
}
//or
if (isset($_REQUEST['product_name'])) {
    $var = $_REQUEST['product_name'];
}

?>

I hope you get an idea about php undefined index.
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