Test test test

gistfile1.txt

<?php

$data = array(
    array(
        'id' => 101,
        'name' => 'Foo',
    ),
    array(
        'id' => 102,
        'name' => 'Bar',
    ),
    array(
        'id' => 150,
        'name' => 'Baz',
    ),
);

$IDs = array();
foreach ($data as $row) {
    $IDs[] = $row['id'];
}

echo join(', ', $IDs);
// Will print '101, 102, 150'