What potential issues could arise when using the code provided to compare data from a file with database entries?

One potential issue that could arise is that the code provided does not handle errors or exceptions that may occur during the comparison process, leading to unexpected behavior or crashes. To solve this, we can implement error handling mechanisms such as try-catch blocks to gracefully handle any errors that occur. 

try {
    // code to compare data from file with database entries
    // ...
} catch (Exception $e) {
    // handle the error or exception
    echo "An error occurred: " . $e->getMessage();
}

Keywords

file handling database comparison SQL injection error handling data validation

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