What does the error "Undefined index" indicate in PHP?

The error "Undefined index" in PHP indicates that you are trying to access an array key that does not exist. This can happen when you are trying to access an element in an array using a key that is not defined. To solve this issue, you should check if the key exists in the array before trying to access it. 

// Check if the key exists before accessing it
if(isset($array['key'])) {
    // Access the array element
    $value = $array['key'];
} else {
    // Handle the case when the key is not defined
    echo "Key 'key' is not defined in the array";
}

Keywords

Undefined index PHP error array key

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