/PHP/If file is not selected in file input type php

If file is not selected in file input type php

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For Single file:

if ($_FILES['logo']['name'] == "") {
    // No file was selected for upload, your (re)action goes here
}
For Multiple files:

if ($_FILES['logo']['tmp_name'][0] == "") {
    // No files were selected for upload, your (re)action goes here
}

Source: stackoverflow.com

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