toAssoc Collection Macro

to_assoc.php

<?php

// Given a collection of pairs, turn it into a key => value collection
Collection::macro('toAssoc', function () {
    return $this->reduce(function ($items, $pair) {
        list($key, $value) = $pair;
        return $items->put($key, $value);
    }, new static);
});

$people = collect([
    ['name' => 'Adam Wathan', 'email' => 'adam@example.com', 'home_town' => 'Cambridge'],
    ['name' => 'David Hemphill', 'email' => 'david@example.com', 'home_town' => 'Fort Worth'],
    ['name' => 'Benjamin Milde', 'email' => 'benjamin@example.com', 'home_town' => 'Augsburg'],
]);

$emailLookup = $people->map(function ($person) {
    return [$person['name'], $person['email']];
})->toAssoc();
// => [
//  'Adam Wathan' => 'adam@example.com',
//  'David Hemphill' => 'david@example.com',
//  'Benjamin Milde' => 'benjamin@example.com',
// ]