How can array_walk_recursive() be used to manipulate CSV output in PHP?

To manipulate CSV output in PHP using array_walk_recursive(), you can iterate through a multidimensional array representing the CSV data and apply a callback function to manipulate each value before outputting it. This allows you to modify the data as needed before writing it to a CSV file or displaying it to the user. 

$data = [
    ['John', 'Doe', 'john.doe@example.com'],
    ['Jane', 'Smith', 'jane.smith@example.com'],
];

// Define a callback function to manipulate each value
function manipulateValue(&$value, $key)
{
    $value = strtoupper($value); // Convert value to uppercase
}

// Apply the callback function to each value in the multidimensional array
array_walk_recursive($data, 'manipulateValue');

// Output the data as CSV
$fp = fopen('output.csv', 'w');
foreach ($data as $fields) {
    fputcsv($fp, $fields);
}
fclose($fp);

Keywords

array_walk_recursive CSV output manipulation PHP function

Related Questions