What does the PHP Notice "Undefined offset" indicate and how can it be resolved in PHP code?

The PHP Notice "Undefined offset" indicates that you are trying to access an array element using an index that does not exist. This can be resolved by first checking if the index exists in the array before trying to access it. 

if(isset($array[$index])) {
    // Access the array element here
} else {
    // Handle the case where the index is undefined
}

Keywords

PHP Notice Undefined offset Error Resolution

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