What does the error "Notice: Undefined index" indicate in PHP scripts?

The error "Notice: Undefined index" in PHP scripts indicates that the code is trying to access an array key that doesn't exist. This usually happens when trying to access an array element using a key that is not set or misspelled. To solve this issue, you should first check if the key exists in the array before trying to access it. 

if(isset($_POST['key'])) {
    $value = $_POST['key'];
    // continue processing the value
} else {
    // handle the case when the key is not set
}

Keywords

Notice Undefined index PHP scripts error indicate

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