What are the advantages of using round() function in PHP for rounding numerical values, and how can it be applied effectively in file size calculations?

When dealing with numerical values in PHP, the round() function can be used to round numbers to a specified precision. This can be particularly useful when working with file sizes, as it allows for more accurate calculations and easier readability. By using the round() function, you can ensure that file sizes are displayed in a consistent and user-friendly format. 

$fileSize = 123456789; // File size in bytes
$roundedSize = round($fileSize / 1024 / 1024, 2); // Convert bytes to megabytes and round to 2 decimal places
echo "File size: " . $roundedSize . " MB";

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round() PHP function numerical values file size calculations advantages

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