I am reading csv file and what array_map() function does in this function?

Question

In PHP, I want to read a ".CSV" file using the following function.

function csv_to_array($filename='a.txt',  $header_exist=true, $delimiter="\t")

{

    if(!file_exists($filename) || !is_readable($filename))

        return FALSE;



    $header = NULL;

    $data = array();

    if (($handle = fopen($filename, 'r')) !== FALSE)

    {

        while (($row = fgetcsv($handle, 1000, $delimiter)) !== FALSE)

        {

            if($header_exist)

            {

                if(!$header)

                    $header = array_map('trim', $row);

                else

                    $data[] = array_combine($header, $row);

            }

            else

                $data[] = $row;

        }

        fclose($handle);

    }

    return $data;

}

and I am bit confused about

array_map()

function. I think it is supposed to map column names to each attribute is that so then how to fetch and display eacg attribute?

Thank you!

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Answer 1

Opening a manual page for array_map you can see that:

array_map — Applies the callback to the elements of the given arrays

So, you have a callback, which is trim (a core php function) and an array, which is $row. So, function trim now applied to each element of $row.

So, it is equivalent of:

$header = [];
foreach ($row as $item) {
    $header[] = trim($item);
}

I am reading csv file and what array_map() function does in this function?

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