php undefined index 3a error

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Antonin
19 Apr 2020
1// Your array index has no value or is not referencing anything,
2// The easiest way to overcome this is to simply check whether
3// it has been defined
4if (isset($arr[$i])) {
5	// Do something
6}
source
Davide
29 Jun 2020
1// Before using $_POST['value']    if (isset($_POST['value']))    {              // Instructions if $_POST['value'] exist    }
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