What are some common errors that can occur when trying to add line breaks to data in PHP files and how can they be resolved?

Common errors when adding line breaks to data in PHP files include using the wrong escape characters (\n instead of PHP_EOL), not properly concatenating the line breaks with the data, or not using the correct syntax for echoing the data with line breaks. To resolve these issues, use the PHP_EOL constant for cross-platform compatibility, concatenate the data with the line breaks using the concatenation operator (.), and ensure to properly echo the data with line breaks.

// Example of adding line breaks to data in PHP files
$data = "First line" . PHP_EOL . "Second line" . PHP_EOL . "Third line";
echo $data;