output_csv.php

<?php

header('Content-Type: text/csv');

$data[] = ['sent'
         , 'success'
         , '114661698'
         , '709081462'
         , '+919900123456'
];

$data[] = ['sent'
         , 'success'
         , '134707665'
         , '937687314'
         , '+917795987654'
];

$out = fopen('php://output', 'w');

foreach($data as $row)
    fputcsv($out, $row);

fclose($out);

exit;