How to map a 2D array to 1D array in PHP - php

Question

I can't figure out how to do the following array_map in php. Any help is much appreciated.
Input:
$arrayA = [
[
'slug' => 'bob',
'name' => 'Bob',
'age' => '10',
],
[
'slug' => 'alice',
'name' => 'Alice',
'age' => '15',
],
[
'slug' => 'carl',
'name' => 'Carl',
'age' => '17',
]
]
Desired Output:
$arrayB = [
'bob' => 'Bob',
'alice' => 'Alice',
'carl' => 'Carl'
]
What I have so far:
Here I am mapping to an array and I know it's not what I want but I can not figure out if there is some syntax for me to return just $x['slug'] => $x['name'] without the brackets?
$arrayB = array_map(fn($x) => [$x['slug'] => $x['name']], $arrayA);
My current output (not what I want):
$arrayB = [
[ 'bob' => 'Bob' ],
[ 'alice' => 'Alice' ],
[ 'carl' => 'Carl' ]
];

Answer 1

There is a PHP function that can do exactly what you want: array_column()
$arrayA = [
[
'slug' => 'bob',
'name' => 'Bob',
'age' => '10',
],
[
'slug' => 'alice',
'name' => 'Alice',
'age' => '15',
],
[
'slug' => 'carl',
'name' => 'Carl',
'age' => '17',
]
];
$arrayB = array_column($arrayA, 'name', 'slug');
That will give you:
Array
(
[bob] => Bob
[alice] => Alice
[carl] => Carl
)
Here's a demo: https://3v4l.org/LGcES

Answer 2

With array_map you cant generate a array with the schema what you want. Use instead array_map foreach. like that:
<?php
$arrayA = [
[
'slug' => 'bob',
'name' => 'Bob',
'age' => '10',
],
[
'slug' => 'alice',
'name' => 'Alice',
'age' => '15',
],
[
'slug' => 'carl',
'name' => 'Carl',
'age' => '17',
]
];
$arrayB = [];
foreach($arrayA as $i) {
$arrayB[$i['slug']] = $i['name'];
}
print_r($arrayB);
// output:
/* Array (
[bob] => Bob
[alice] => Alice
[carl] => Carl
)