Get column of last names from a recordset, indexed by the "id" column:

SUBMITTED BY: henry1874w

DATE: June 22, 2017, 12:10 a.m.

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<?php
// An array that represents a possible record set 
returned from a database
$a = array(
  array(
    'id' => 5698,
    'first_name' => 'Peter',
    'last_name' => 'Griffin',
  ),
  array(
    'id' => 4767,
    'first_name' => 'Ben',
    'last_name' => 'Smith',
  ),
  array(
    'id' => 3809,
    'first_name' => 'Joe',
    'last_name' => 'Doe',
  )
);

$last_names = array_column($a, 'last_name', 'id');
print_r($last_names);
?>
Output:

Array
(
  [5698] => Griffin
  [4767] => Smith
  [3809] => Doe
)