Online PHP editor | output for qWO1f

@ 2016-09-12T12:45:42Z

<?php

class Foo {
    private $groupId;
    private $value;
    
    function __construct($groupId, $value) {
        $this->groupId = $groupId;
        $this->value = $value;
    }
    
    function getGroupId() {
        return $this->groupId;
    }
};

$foos = [
    new Foo(1, 'Bar'),
    new Foo(1, 'Ban'),
    new Foo(1, 'Bak'),
    new Foo(2, 'Gas'),
    new Foo(2, 'Gar'),
];

var_dump(array_reduce($foos, function($carry, $item){
    if(!isset($carry[$item->getGroupId()])) {
        $carry[$item->getGroupId()] = [];    
    }
    
    $carry[$item->getGroupId()][] = $item;
    return $carry;
}, []));

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: array(2) { [1]=> array(3) { [0]=> object(Foo)#1 (2) { ["groupId":"Foo":private]=> int(1) ["value":"Foo":private]=> string(3) "Bar" } [1]=> object(Foo)#2 (2) { ["groupId":"Foo":private]=> int(1) ["value":"Foo":private]=> string(3) "Ban" } [2]=> object(Foo)#3 (2) { ["groupId":"Foo":private]=> int(1) ["value":"Foo":private]=> string(3) "Bak" } } [2]=> array(2) { [0]=> object(Foo)#4 (2) { ["groupId":"Foo":private]=> int(2) ["value":"Foo":private]=> string(3) "Gas" } [1]=> object(Foo)#5 (2) { ["groupId":"Foo":private]=> int(2) ["value":"Foo":private]=> string(3) "Gar" } } }

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