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@ 2022-08-15T11:31:33Z

<?php

$clients = [
            'users' => [
                '0' => [
                    'id' => '1212',
                    'phone' => '22204490122',
                    'message' => 'dddd',
                ],
                '1' => [
                    'id' => '4111',
                    'phone' => '22204490122',
                    'message' => 'aaaa',
                ],
            ]
        ];

$last = count($clients['users']) - 1;

echo $clients['users'][$last]['id'];

$last = array_key_last($clients['users']);

echo $clients['users'][$last]['id'];

Output
Performance
VLD
References
Branches

array_key_last: documentation ( source)

preferences:dark modelive previewkey bindings

114.92 ms | 1234 KiB | 5 Q