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@ 2015-02-08T16:57:39Z

<?php

$result = array(
    array(
            'task_id' => 1,
            'name' => 'do dishes',
            'user' => 'bob'
        ),
    array(
            'task_id' => 1,
            'name' => 'do dishes',
            'user' => 'liam'
        ),
    array(
            'task_id' => 2,
            'name' => 'vacuum',
            'user' => 'liam'
        ),
    array(
            'task_id' => 3,
            'name' => 'Take out thrash',
            'user' => 'liam'
        ),
    array(
            'task_id' => 3,
            'name' => 'Take out thrash',
            'user' => 'bob'
        ),
    );
    

function get_arrayvalues_bykeyvalue($array, $key, $key2, $v2)
{
    $ret = array();
    foreach($array as $arr)
    {
        foreach($arr as $k => $v)
        {
            if($arr[$key2] == $v2)
            {
                if($k == $key)
                    $ret[] = $v;   
            }
        }
    }
    $u = array_unique($ret);
    return (sizeof($u) == 1) ? $u[0] : $u;
}

$res = array();
foreach($result as $arr)
{
    foreach($arr as $k => $v)
    {
        if($k == 'user')
            $res[$arr['task_id']][$k] = get_arrayvalues_bykeyvalue($result, $k, 'task_id', $arr['task_id']);
        else
            $res[$arr['task_id']][$k] = $v;
    }
}

print_r($res);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [1] => Array ( [task_id] => 1 [name] => do dishes [user] => Array ( [0] => bob [1] => liam ) ) [2] => Array ( [task_id] => 2 [name] => vacuum [user] => liam ) [3] => Array ( [task_id] => 3 [name] => Take out thrash [user] => Array ( [0] => liam [1] => bob ) ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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