php array to csv conversion with column headers

Question

I want to convert array to csv ,im able to convert the associative array to csv.

But not able to get the headers.

I want the NUMBER TYPE DATE as headers dynamically

Below is the array i converrted .

Array
(
    [0] => Array
        (
            [NUMBER] => 67
            [TYPE] => Other
            [DATE] => 3/31/2011
        )
     [1] => Array
          (
            [NUMBER] => 87
            [TYPE] => something
            [DATE] => 3/28/2011


          )
     [2] => Array
          (
            [NUMBER] => 67
            [TYPE] => Other
            [DATE] => 3/2/2011


          )

)

The code is given below .But not able to get the headers but its values are coming.

<?
 $fp1 = fopen('file.csv', 'w');

foreach ($arr2 as $fields) 
{
    fputcsv($fp1, $fields);
}

fclose($fp1);
?>

Answer 1

Just use array_keys to get the keys and write them to the file first.

fputcsv($han, array_keys($arr[0]));
foreach ($arr as $a) { ... }

This assumes that you have a numeric array though (and it assumes that it's not empty). If arr[0] is not guaranteed to be set, you can use array_shift or array_slice to extract the first element. (Or you could just have a flag in your loop of whether or not the header is already written -- just have it default to false. If it's not true, set it to true and print the header.)

---

While I'm at it, you can use array_combine to go the opposite direction (CSV to array of associative arrays).

$data = array();
$header = fgetcsv($han);
while (($row = fgetcsv($han)) !== false) {
    $data[] = array_combine($header, $row);
}

(Note that this assumes you have no blank rows -- a blank row would return array() which will issue a warning with the combine and put non-sense into data.)

Answer 2

Robert Clark's answer is very close, but still needs simplification: There's no need for the else clause:

    $pathToGenerate='array.csv';    // your path and file name
    $header=FALSE;
    $createFile=fopen($pathToGenerate,'w+');
    foreach ($array as $row)
    {   if (!$header)
        {   fputcsv($createFile,array_keys($row));
            $header=TRUE;
        }
        fputcsv($createFile,$row);   // write the data for all rows
    }
    fclose($createFile);

Answer 3

This worked nicely for me null $header will not be null once you assign the keys then the rows will follow.

$header=null;
$createFile = fopen($pathToGenerate,"w+");
foreach ($assocArray as $row) {
    if(!$header){
        fputcsv($createFile,array_keys($row));
    }else{
    fputcsv($createFile, $row);
    }
}
fclose($createFile);

not as short as above but I find it quite readable.

Answer 4

DarrenK 's answer is readable but incomplete. So for the noephytes.

    $pathToGenerate = 'array.csv';  // your path and file name
    $header=null;
    $createFile = fopen($pathToGenerate,"w+");
    foreach ($array as $row) {

        if(!$header) {

            fputcsv($createFile,array_keys($row));
            fputcsv($createFile, $row);   // do the first row of data too
            $header = true;
        }
        else {

            fputcsv($createFile, $row);
        }
    }
    fclose($createFile)