What are common pitfalls to avoid when merging data from different CSV files in PHP?

One common pitfall to avoid when merging data from different CSV files in PHP is not properly handling headers. It is important to ensure that the headers of the CSV files match before merging the data to avoid any confusion or errors. Additionally, make sure to properly handle any duplicate entries that may arise during the merging process. 

// Read the first CSV file
$csv1 = array_map('str_getcsv', file('file1.csv'));

// Read the second CSV file
$csv2 = array_map('str_getcsv', file('file2.csv'));

// Check if headers match
if ($csv1[0] !== $csv2[0]) {
    die("Headers do not match. Cannot merge data.");
}

// Merge the data from both CSV files
$mergedData = array_merge($csv1, $csv2);

// Remove duplicate entries
$mergedData = array_map("unserialize", array_unique(array_map("serialize", $mergedData)));

// Write the merged data to a new CSV file
$fp = fopen('merged_file.csv', 'w');
foreach ($mergedData as $fields) {
    fputcsv($fp, $fields);
}
fclose($fp);

Keywords

PHP CSV files merging data errors

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