What considerations should be made when using file_get_contents to retrieve IDs for database queries in PHP?

When using file_get_contents to retrieve IDs for database queries in PHP, it is important to sanitize and validate the input to prevent SQL injection attacks. Additionally, it is recommended to check if the file exists and handle potential errors that may occur during the file retrieval process. 

$id = filter_var($_GET['id'], FILTER_SANITIZE_NUMBER_INT);

if (file_exists('ids.txt')) {
    $ids = file_get_contents('ids.txt');
    $idsArray = explode(',', $ids);

    if (in_array($id, $idsArray)) {
        // Perform database query using the retrieved ID
    } else {
        echo "Invalid ID";
    }
} else {
    echo "File not found";
}

Keywords

file_get_contents database queries PHP security error handling

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