PHP define the key of an array from a value of an object [duplicate]

Question

With PHP, I have list of Object. Each object have id field :

$myArray = [
    0 => Object{
        'id' => 1,
        'title' => 'My title 1'
    },
    1 => Object{
        'id' => 2,
        'title' => 'My title 2'
    },
    2 => Object{
        'id' => 6,
        'title' => 'My title 6'
    }
]

I want to set array key from id object without additional foreach. I want this result :

$myArray = [
    1 => Object{
        'id' => 1,
        'title' => 'My title 1'
    },
    2 => Object{
        'id' => 2,
        'title' => 'My title 2'
    },
    6 => Object{
        'id' => 6,
        'title' => 'My title 6'
    }
]

I think it's possible with array_map but I don't know how to do it. I tried this but it returns sub array :

$newArray = array_map(function($entry) {
    return [$entry->id => $entry];
}, $myArray);

// return :

[
    0 => [
        1 => Object{
            'id' => 1,
            'title' => 'My title 1'
        },
    ],
    1 => [
        2 => Object{
            'id' => 2,
            'title' => 'My title 2'
        },
    ],
    2 => [
        6 => Object{
            'id' => 6,
            'title' => 'My title 6'
        }
    ]
]

array_map will return a new array. You may try with array_walk — Melvyn Marigny
– Melvyn Marigny, Commented Apr 21, 2020 at 16:34

user1597430 · Accepted Answer · 2020-04-21 16:40:16Z

2

$myArray = array_column($myArray, null, 'id');

answered Apr 21, 2020 at 16:40

user1597430

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2 Comments

Barmar Over a year ago

This is better than the solution I was going to suggest, which combines array_column with array_combine.

Ahmed Moayad AlMoghrabi Over a year ago

This solution is cool

Ahmed Moayad AlMoghrabi · Accepted Answer · 2020-04-21 16:44:17Z

0

Try using this

array_combine(array_column($myArray, 'id'), $myArray);

This way you will make the ID as the key and keep all the array related to id as the value for this index.

answered Apr 21, 2020 at 16:44

Ahmed Moayad AlMoghrabi

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