(PHP 5 >= 5.5.0)
array_column — Return the values from a single column in the input array
array_column() returns the values from a single column of
the input 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.
input
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.
Returns an array of values representing a single column from the input array.
Example #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);
?>
以上例程会输出：
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
Example #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);
?>
以上例程会输出：
Array
(
[2135] => Doe
[3245] => Smith
[5342] => Jones
[5623] => Doe
)