PHP

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

php 8 undefined array key as notice

set_error_handler(function($errno, $error){
    if (!str_starts_with($error, 'Undefined array key')){
        return false;  //default error handler.
    }else{
        trigger_error($error, E_USER_NOTICE);
        return true;
    }
}, E_WARNING);

then 
ini_set ("error_reporting",  E_ALL & ~E_NOTICE & ~E_USER_NOTICE)

Warning : Undefined array key

<?php if(isset($_GET['fname']) && isset($_GET['age'])): ?> //isset is important
        <br/>
        Your name is <?php echo $_GET["fname"]; ?>
        <br/>
        Your age is <?php echo $_GET["age"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>

undefined array key php

<?php if(isset($_GET['name'])): ?>
        Your name is <?php echo $_GET["name"]; ?>
<?php endif; ?>