PHP array column

Definition and Usage

The array_column() function returns the values from a single column in the input array.

---

Syntax

array_column(array, column_key, index_key)

https://www.w3schools.com/php/func_array_column.asp

<?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');
print_r($last_names);
?>

Output:

Array
(
  [0] => Griffin
  [1] => Smith
  [2] => Doe

) 

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

<?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
)