php undefined index
// Your array index has no value or is not referencing anything,
// The easiest way to overcome this is to simply check whether
// it has been defined
if (isset($arr[$i])) {
// Do something
}php undefined index
// Your array index has no value or is not referencing anything,
// The easiest way to overcome this is to simply check whether
// it has been defined
if (isset($arr[$i])) {
// Do something
}php undefined index meaNING
$_SESSION['yy'] = isset($_POST['yy']) ? $_POST['yy'] : ""; // This is on line 11
$_SESSION['mm'] = isset($_POST['mm']) ? $_POST['mm'] : ""; // This is on line 12
$_SESSION['dd'] = isset($_POST['dada']) ? $_POST['dada'] : ""; // This is on line 13how to prevent the Undefined index in php
// Before using $_POST['value'] if (isset($_POST['value'])) { // Instructions if $_POST['value'] exist }Copyright © 2021 Codeinu
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