array_column¶
array_column() extracts the index or property of the second argument from a list of arrays or objects passed as first argument.
It may also assign a key in regards to that value, from a second index or property.
array_column() omits silently any missing index or property.
array_column() uses the whole array or object as value, when the second argument is null.
array_column() is more efficient than custom code to convert an array into a map.
<?php
$list = [
['a' => 1, 'b' => 'x'],
['a' => 2, 'b' => 'y'],
['a' => 3, 'd' => 'z'],
];
array_column($list, 'a'); // [1, 2, 3]
array_column($list, 'b'); // [x, y]
array_column($list, 'a', 'b'); // [x => 1, y => 2, 0 => 3]
class X {
function __construct(public int $a, public string $b, public string $c) {}
}
$list = [
new X(a: 1, b: 'x'),
new X(a: 2, b: 'y'),
new X(a: 3, d: 'z'),
];
array_column($list, 'a'); // [1, 2, 3]
?>
See also array_column() on 3v4l.org.
Related : array_combine(), Hash, Map, Array, Index For Arrays
