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Funções para Array
PHP Manual

# array_column

(PHP 5 >= 5.5.0)

array_column — Return the values from a single column in the input array

### Descrição

array array_column ( array `$array` , mixed `$column_key` [, mixed `$index_key` = null ] )

array_column() returns the values from a single column of the `array`, identified by the `column_key`. Optionally, you may provide an `index_key` to index the values in the returned array by the values from the `index_key` column in the input array.

### Parâmetros

`array`

  A multi-dimensional array (record set) from which to pull a column of values.

`column_key`

  The column of values to return. This value may be the integer key of the column you wish to retrieve, or it may be the string key name for an associative array. It may also be `NULL` to return complete arrays (useful together with `index_key` to reindex the array).

`index_key`

  The column to use as the index/keys for the returned array. This value may be the integer key of the column, or it may be the string key name.

### Valor Retornado

Returns an array of values representing a single column from the input array.

### Exemplos

Exemplo #1 Get column of first names from recordset

`<?php
// Array representing a possible record set returned from a database
$records = array(
array(
'id' => 2135,
'first_name' => 'John',
'last_name' => 'Doe',
),
array(
'id' => 3245,
'first_name' => 'Sally',
'last_name' => 'Smith',
),
array(
'id' => 5342,
'first_name' => 'Jane',
'last_name' => 'Jones',
),
array(
'id' => 5623,
'first_name' => 'Peter',
'last_name' => 'Doe',
)
);
$first_names = array_column($records, 'first_name');
print_r($first_names);
?>`

O exemplo acima irá imprimir:

    Array
    (
        [0] => John
        [1] => Sally
        [2] => Jane
        [3] => Peter
    )

Exemplo #2 Get column of last names from recordset, indexed by the "id" column

`<?php
// Using the $records array from Example #1
$last_names = array_column($records, 'last_name', 'id');
print_r($last_names);
?>`

O exemplo acima irá imprimir:

    Array
    (
        [2135] => Doe
        [3245] => Smith
        [5342] => Jones
        [5623] => Doe
    )

array_chunk
array_combine
Funções para Array
PHP Manual