An indexed array of an array of objects

Question

How do I create (in PHP) and array of an array of objects? For example, say I have:

$arr[0] = array("eref_id" => "A001", "eref_child" => "A100", "level" => 1);
$arr[1] = array("eref_id" => "A002", "eref_child" => "A200", "level" => 2);
$arr[2] = array("eref_id" => "A003", "eref_child" => "A300", "level" => 3);
$arr[3] = array("eref_id" => "A003", "eref_child" => "A310", "level" => 3);

An I want a new array where the elements of "arr" are the "eref_id" and "eref_child" but the index to the array is the "level" element. So basically,

$newarr[1] would contain $arr[0]
$newarr[2] would contain $arr[1]
$newarr[3] would contain $arr[2]

and $arr[3] (since both have a "level" of 3).

This would contain an array of $arr[2] and $arr[3].

Hopefully this makes sense

Surely you've tried something. Post it here.

John Conde
– John Conde

2014-03-11 19:59:06 +00:00
Commented Mar 11, 2014 at 19:59 — John Conde
– John Conde, Commented Mar 11, 2014 at 19:59

woru · Accepted Answer · 2015-01-07 10:13:43Z

2

You can do it easily with ouzo goodies

In php 5.4:

$result = Arrays::toMap($arr, Functions::extract()['level']);

In php 5.3:

$result = Arrays::toMap($arr, function($elem) { return $elem['level']; });

If you had an array of e.g. User objects:

$cities = Arrays::map($users, Functions::extract()->getAddress('home')->city);

Check out: http://ouzo.readthedocs.org/en/latest/utils/functions.html#extract

answered Jan 7, 2015 at 10:13

woru

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Samuel Cook · Accepted Answer · 2014-03-11 20:01:33Z

0

<?php
$arr[0] = array("eref_id" => "A001", "eref_child" => "A100", "level" => 1);
$arr[1] = array("eref_id" => "A002", "eref_child" => "A200", "level" => 2);
$arr[2] = array("eref_id" => "A003", "eref_child" => "A300", "level" => 3);
$arr[3] = array("eref_id" => "A003", "eref_child" => "A310", "level" => 3);

foreach($arr as $a){
    $newarr[$a['level']][] = $a;
}

echo '<pre>',print_r($newarr),'</pre>';

answered Mar 11, 2014 at 20:01

Samuel Cook

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