What is the significance of the error "Notice: Undefined index: files" in PHP?

The error "Notice: Undefined index: files" in PHP indicates that the code is trying to access an array key that does not exist. This usually happens when trying to access an array element that has not been set or initialized. To solve this issue, you need to check if the key exists in the array before trying to access it. 

if (isset($_FILES['files'])) {
    // Access the 'files' key in the $_FILES array
    $files = $_FILES['files'];
    // Continue with processing the files
} else {
    // Handle the case where 'files' key is not set
}

Keywords

PHP error Notice Undefined index files

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